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Livestock and poultry production remains a basis of agricultural livelihood across the tropical regions of the world. Livestock management is an art where maximizing the productivity and profitability is the main goal. As far as our country is concerned, at present livestock sector contributes 4.11% GDP and 25.6% of total Agriculture GDP. Yet, one of the most persistent challenges faced by farmers, researchers and policymakers is the reliable provision of nutritious, cost-effective and locally available feed resources. In view of this, it is of great concern that presently in the tropics, there is a marked shortfall of green fodder (28 to 35%), dry fodder (10 to 11%) and concentrates (33 to 35%). Hence, to cope up this gap, a sustainable feeding strategy using both conventional and unconventional feed resources available in the tropics may be utilized. This book, Feeds and Fodders for Livestock and Poultry, is need of the hour as it aims to serve as a comprehensive guide for students, extension workers, veterinarians, academicians and progressive farmers who seek to understand the various sources of feeds and fodders with their detail nutritive values. This book will help the scientific communities, farmers and entrepreneurs to formulate balanced ration in normal as well as during scarcity period for livestock and poultry. Students competing in various competitive examinations (ARS, IFS, ICAR-NET, civil service etc) will surely be benefitted from this book. Information available in this book is presented in a concise manner which will definitely attract wide number of readers.

Introduction India possesses the largest livestock population globally. To sustain this extensive livestock sector, it is essential for the country to ensure a corresponding supply of feed and fodder that meets the growing demand. However, a significant barrier for enhancing livestock production in India is the inadequate availability of feeds and fodders, both in terms of quality and quantity. The limited land designated for cultivation approximately 3.3-4.4% of the total cultivable area coupled with the decline in pasture lands and a shift in cropping patterns from coarse cereals to commercial crops, poses substantial risks to fulfilling the nation’s feed and fodder requirements. A considerable portion of the coarse cereal byproducts is utilized as fodder. Projections indicate a shortfall of 28% to 35% in green fodder, 10% to 11% in dry fodder and 33% to 35% in concentrates (Niti Aayog, 2018). The current status of feed and fodder resources is insufficient to meet the rising demand. Proper feeding is vital for the improvement of livestock breeds, as inadequately fed improved breeds tend to deteriorate more quickly. Consequently, there is a persistent imbalance between the number of animals and the available feed resources. Commonly used feeds and fodders for the feeding of livestock Cereal Grains i. Maize (Zea mays). By-products: ‘Maize gluten feed’, ‘Maize gluten meal’, Maize bran and maize germ meal ii. Bajra (Pennisetum americanum) iii. Barley (Hordeum sativum) iv. Jowar (Sorghum bicolar L. moench) v. Oats (Avena sativa) vi. Ragi (Eleusine coracana) vii. Rice (Oryzae sativa). By-products: ‘Rice bran’ and ‘Rice polish’ viii. Rye (Secale cereale)

Forages can be classified according to the nutrient density in the dry matter. Roughages: These are diets that have more than 18% crude fiber, more than 35% cell wall content, and less than 60% TDN on DMB. There are two types of roughage: dry roughage and green roughage. Roughages are classified as succulent or non-succulent according on their moisture content. Succulent feeds are ones with greater than 80% moisture. Non-succulent feed contains less amount of moisture. Roughages can also be classified based on legumes, for example, leguminous and non-leguminous roughages. Roughages are divided into three types based on their nutritional content (on DMB): maintenance, productive and non-maintenance. Roughages: Feedstuffs having more than 18% crude fibre, more than 35% cell wall contents and less than 60% TDN on dry matter basis (DMB) are known as roughages. There are two kinds of roughages, dry roughage and green roughage. On the basis of moisture content the roughages can be classified into succulent and non-succulent. Succulent feeds are those which contain more than 80% moisture. Feed contains lesser amount of moisture is known as non-succulent. Roughages can also be classified on the basis of legumes. e.g. leguminous and non-leguminous roughages. Roughages can be classified based on their nutritive value (on DMB) into maintenance type, productive type and non-maintenance type.

Grass and Forage Crops Grassland can be divided into natural grassland and cultivated grassland. Natural pastureland includes rough and hilly grazing land. Grasses, legumes and herbs are examples of natural grassland. Cultivated grassland can be divided into temporary grassland and permanent grassland. Chemical composition of grassland Dry matter: The composition of the dry matter is dependent on the relative proportions of cell walls and cell contents. In very young grasses its moisture content is 75-85% while in mature material its moisture is around 60%. Crude protein: Proteins represent the nitrogenous substances found in herbage, with true protein constituting approximately 80 percent of the total nitrogen content. While the overall protein concentration diminishes as the plant matures, the relative distribution of amino acids remains relatively stable. Additionally, the amino acid profiles of proteins show minimal variation across different grass species. Approximately half of the cellular protein in grasses is comprised of a single enzyme, ribulose bisphosphate carboxylase, which is crucial for the photosynthetic process of carbon dioxide fixation. The average crude protein content ranges from about 3% in very mature herbage to as high as 30% in young, heavily fertilized grass. In mature herbage, a considerable portion of the protein may be indigestible due to its association with fiber, specifically in the form of acid detergent insoluble nitrogen (ADIN). Grass proteins are notably abundant in the amino acid arginine and also contain significant levels of glutamic acid and lysine. They exhibit a higher biological value for growth compared to seed proteins. Methionine is identified as the first limiting amino acid, followed by isoleucine, which is not utilized by ruminants. The rumen displays a rumen degradable protein (RDP) level of 80-90%. The primary constituents of non-protein nitrogen (NPN) include amino acids, amides, and nitrates. In the rumen, excessive nitrates (-NO3) are converted into nitrites (-NO2), which subsequently lead to the conversion of ferrous ions to ferric ions (methaemoglobin), rendering them incapable of transporting oxygen.

Legumes Mutualistic bacteria, such as Rhizobium, form symbiotic relationships with leguminous plants, including various species within the pea family. The Leguminoseae family is particularly recognized for its ability to engage in symbiosis with nitrogen-fixing bacteria and its resilience to drought conditions. Among pasture legumes, clovers (Trifolium spp.) are predominant, with red clover (Trifolium pratense) and white clover (Trifolium repens) being the most prevalent species in cooler, wetter regions like Europe and New Zealand. Clovers exhibit a higher protein and mineral content compared to grasses, particularly in terms of calcium, phosphorus, magnesium, copper and cobalt, although their nutritional value tends to diminish as they mature. The sugars found in clovers are akin to those in grasses, with sucrose being the primary sugar. While fructans are typically absent, starch is present, with concentrations in dried red clover leaves reaching up to 50 g/kg DM. In the UK, lucerne is characterized by its high fiber content, especially in the stems, which can reach crude fiber levels of 500 g/kg DM at the late flowering stage. Lucerne cultivars are categorized based on their flowering times, with early-flowering varieties recommended for UK conditions. These varieties generally bloom in the second week of June; however, to ensure acceptable digestibility, the initial harvest should occur at the early bud stage (end of May), when the anticipated digestible organic matter (DOM) content is between 620 and 640 g/kg DM. Subsequent cuts should be made at intervals of 6 to 8 weeks, yielding DOM values of 560 to 600 g/kg DM. In Britain, the limited area of lucerne cultivated is primarily harvested for silage or artificial drying, whereas in other regions, particularly the USA, where it is referred to as alfalfa, the crop is also utilized for grazing. Berseem, also known as Egyptian clover (Trifolium alexandrinum), is a significant leguminous plant cultivated primarily in the Mediterranean region and India. Its rapid growth during the cooler winter months in subtropical climates is highly regarded, along with its ability to recover effectively after being cut or grazed. The nutritional profile of berseem is comparable to that of lucerne. Additionally, crops such as peas (Pisum sativum) and faba beans (Vicia faba) are occasionally cultivated as green fodder. When harvested at the early flowering stage, these crops exhibit a nutritive value akin to that of other legumes.

their starchy seeds, which are scientifically referred to as caryopsis. These plants, along with cereal fodders and grasses, typically exhibit a determinate growth pattern and the quality of their herbage tends to decline following the flowering stage. Kharif Crop (Hot and Wet Season) 1. Bajra /Pearl millet (Pennisetum americanum/typhoides): Bajra, also known as pearl millet, ranks as the fourth most significant cereal crop, following rice, wheat and sorghum. This crop is primarily cultivated for both grain production and as fodder. It thrives predominantly in the arid and semi-arid regions of India, where it is typically grown as a rain-fed crop during the Kharif season, specifically in the months of June and July. Bajra is characterized by its rapid growth and resistance to diseases, making it an ideal fodder option; however, it is not well-suited for areas with high rainfall. Harvesting and yield: The average yield of green fodder from bajra is approximately 300-400 quintals per hectare. When harvested for grain, the kadbi production can reach 50-60 quintals per hectare. For optimal fodder production, harvesting should occur before the flowering stage or at the 50% flowering mark to ensure quality feed for livestock. Nutritive value: At the flowering stage, the CP content is around 4.50%. The initial cutting is recommended 50-80 days post-sowing, with subsequent cuts occurring every 35-40 days, maintaining a cutting height of 15 cm above ground to promote re-growth. A total of two cuts can be achieved for enhanced yield. Bajra serves as a non-maintenance type of fodder. It is typically harvested and provided to livestock as green fodder, with the potential for conversion into hay or silage. However, the straw produced from bajra is of inferior quality, containing only 4-5% CP and 1% DCP. Additionally, this fodder is high in oxalates, necessitating supplementation with calcium sources such as DCP or calcium-rich leguminous fodder. The composition of bajra includes 8.52% CP, 1.76% EE, 54.91% NFE, 25.01% CF, 9.80% TA, 0.55% Ca and 0.27% P on DMB. The DM content is 22%, with 13% TDN and 0.90% DCP on as-fed basis. When expressed on DMB, the DCP and TDN values are 3.04% and 48.47%, respectively.

Aquatic plants are recognized as a valuable forage crop, ideally utilized in their fresh state, dried as hay, or preserved as silage. Their suitability and profitability vary depending on the type of livestock being fed. These crops do not occupy arable land and require no investment for cultivation; however, there are costs associated with harvesting. Feeding aquatic plants directly in their natural habitat is infrequently feasible due to factors such as water depth, risks posed by mud and pathogens, and potential contamination of the water by livestock. 1. Water Hyacinth (Eichhornia crassipes): Water hyacinth is a perennial herb that floats freely on the surface of freshwater, including rivers, lakes, canals and ponds. In India, the dried form of water hyacinth or its ensilage is utilized as feed for cattle, owing to its high protein content. The amino acid composition of water hyacinth renders it an appropriate feed option for pigs as well. Typically, the plant is chopped and fed directly to livestock; however, its palatability is compromised by the presence of oxalate crystals in the leaves, which can cause oral irritation in animals. Additionally, cattle may experience adverse effects such as diarrhea and increased urination when consuming water hyacinth. This issue can be mitigated by supplementing the diet of adult cattle with groundnut and paddy straw alongside water hyacinth. Ensiling is an effective preservation technique that improves the palatability of water hyacinth. Due to its high moisture content, it is advisable to wilt the plant in the shade for 48 hours, or alternatively, prepare silage by mixing it with straw in a 4:1 ratio. The addition of molasses is to enhance the soluble carbohydrate content. The DCP and TDN in the silage are measured at 5.64% and 40.26%, respectively. The nutrient composition of water hyacinth includes 5.80% DM, 18.30% CP, 22.60% CF, 2% EE, 21.10% TA, 9.50% Ca and 6.30% P. The nutritive value of fresh water hyacinth is 7.66% DCP and 43.73% TDN, with oxalic acid content ranging from 2.50% to 3.60%

Tree leaves serve as a traditional source of roughage for livestock such as sheep, goats, cattle, and buffaloes. During the initial growth phases, these leaves exhibit a relatively high crude protein percentage alongside lower fiber content. However, as the tree matures, there is a notable decline in protein levels and a corresponding increase in crude fiber content. Generally, tree leaves are abundant in Ca, often containing two to three times the amount found in cultivated fodder, but they are deficient in phosphorus, leading to an imbalanced Ca to P ratio. The presence of tannic acid further reduces the digestibility of the protein found in these leaves. The dry matter content of most tree leaves typically falls within the range of 30-40%, accompanied by a significant protein concentration. Although the crude fiber percentage in tree leaves is lower than that in grasses and hays, their digestibility remains poor due to the tannic acid content. Additionally, while the ether extract in tree leaves is relatively high, it is often less digestible compared to that found in cultivated fodder. Leguminous trees and shrubs Animals that graze on mature grass pastures frequently enhance their diet by consuming the leaves of trees and shrubs, many of which belong to the legume family. The term ‘browse’ refers to the food obtained in this manner; in addition to being consumed directly by animals, browse can also be harvested and transported to livestock kept in enclosures. The leaves of leguminous trees are notably rich in protein (200 300 g/kg DM) and minerals, although they also contain a significant amount of fiber (50 60% neutral-detergent fiber/DM). The presence of tannins and potentially other compounds can reduce the palatability of browse, suggesting that its nutritional value may serve as a reserve food source for times when grass is no longer accessible. A prominent example of a browse species is leucaena (Leucaena leucocephala), commonly referred to as ipil-ipil, which is an important tropical legume widely cultivated across various regions. It serves as a significant source of protein and minerals and is abundant in β-carotene. However, it also contains the toxic amino acid mimosine. Other notable leguminous forages include Gliricidia (Gliricidia sepium), Sesbania (Sesbania sesban) and Acacia (Acacia angustissima).

Cereal grains and cereal by-products The appropriate nutrition of livestock necessitates the inclusion of a specific proportion of cereals and their byproducts. For poultry and swine, cereals constitute the primary element of their daily dietary intake. Consequently, there exists a direct competition for these cereal resources between livestock and humans. Specifically, only 2% of rice and wheat, 5% of sorghum, 10% of barley and maize, and 50% of bajra and ragi are allocated for animal feed. Cereals belong to the Gramineae family and are classified as annual plants (Khariff). These grains are primarily composed of carbohydrates, with starch being the predominant component of their dry matter, concentrated in the endosperm. Cereal grains are abundant in TDN and net energy, making them highly palatable to livestock. The DCP content ranges from 7% to 10%, while TDN levels fall between 70% and 80% for ruminants. In non-ruminants, such as pigs and poultry, these energy-rich grains can be incorporated into their diets at proportions of approximately 50% to 70%. Structure of a grain: Grain kernels are referred to as caryopses. Those grains that possess husks, such as oats, barley and rice, are classified as covered caryopses, while grains that lack husks, including maize, wheat, rye, and sorghum, are termed naked caryopses. Each kernel, excluding the husk, consists of two primary components: the pericarp and the seed. Pericarp: This structure is composed of two distinct layers. The outer layer, which includes the epidermis and hydroderm, is collectively known as the beeswing. The inner layer of the pericarp is characterized by the presence of cross cells and tube cells. Seed: The seed is further divided into four components: the seed coat, hyaline layer, endosperm, and germ (embryo). When the grain undergoes processing that removes both the germ and the starch endosperm, the remaining parts of the seed along with the pericarp are referred to as bran.

Protein supplements can be obtained from animal origin or plant origin. Animal origin has mostly over 47% CP, 1.0% Ca, 1.5% P and fewer than 2.5% fiber while plant origin has mostly less than 47% CP, 1.0% Ca, 1.5% P and over 2.5% fibre. Other sources from which protein supplements can be obtained include NPN compounds, single cell protein etc. Plant Origin Oil Cakes In India, oilseeds occupy a significant position in terms of both production area and economic value, ranking second only to food grains. The country is the third-largest producer of oilseeds globally, following the United States and China. Approximately 12-13% of the world’s oilseed cultivation occurs in India, contributing to 6-8% of global oilseed output and 5-7% of the world’s oilseed cake production. Additionally, India is a notable exporter of soybean meal, generating substantial foreign exchange earnings. The agro-ecological conditions in India are conducive to the cultivation of seven key edible oilseeds, namely groundnut, soybean, mustard-rapeseed, sesame, sunflower, safflower and niger. Furthermore, India also produces two significant non-edible oilseeds: linseed and castor. The country is involved in the production of tree oilseeds as well, including coconut and oil palm.

Unconventional feed ingredients are those feed ingredients that are less commonly used in formulations or whose nutritional properties and feeding value are less well understood. Hence, these feeds are not traditionally used for animal feeding either by farmers or by feed manufacturer. Unconventional feed resources Concentrates sources: These are mainly mangoseed kernel, neemseed cake, rubberseed cake, tamarindseed cake, tamarind seed kernel, tapioca waste, salseed cake, safflower cake, nigerseed cake, spent tea waste, mahua cake, karanj cake. Tree leaves and fallen tree leaves: Banyan, peepal, mango, teak, bamboo, neem, gliricidia, banana, cassava, mulberry. Other by-products: groundnut shell, paddy husk, maize cobs, bajra cobs, jowar cobs, husk of bengal gram, black gram, green gram, sugarcane tops, bagasse, water hyacinth, molasses etc. Marine and aquatic waste: Fish waste, frog meal. Starch industry waste: Maize germ, maize bran, maize gluten. Brewery waste: Dried brewer’s grain (after extraction of malt) Slaughter house by-product: Blood meal, meat meal, meat and bone meal, tankage. Poultry industry by-product: Feather meal, offal meal/ poultry waste meal, hatchery waste. High moisture agro-industrial by-products: vegetable and food processing residues, apple/tomato/pineapple pomace, citrus processing waste.

These include mainly tomato pomace, jack fruit waste, pineapple waste, apple pomace and citrus fruit processing waste. 1. Tomato pomace (Lycopersicon esculentum): Tomato pomace consists of the remnants of tomato processing, including peels, crushed seeds, and minimal pulp, which are left after extracting juice, paste, or ketchup. Following juice extraction, the pomace is typically dried and ground. Due to its high moisture content, artificial drying methods can be costly, making sun drying a more favorable option. The pomace should be dried until it reaches a crisp texture. After drying, it is essential to grind the pomace and incorporate the resulting product thoroughly into the diet. The composition of tomato pomace includes 93.5% DM, 17-22% CP, 39% CF, 11.1% EE, 0.44% Ca and 0.36% P, with 55% TDN. In terms of dietary inclusion, tomato pomace can be incorporated into the rations of adult bullocks and milch cows at levels of up to 50% and 16%, respectively, without negative effects. In dairy cows, the intake of dry matter, milk yield and milk composition remained unaffected. Additionally, fresh tomato pomace can serve as a supplementary feed for growing and finishing pigs. Notably, feeding growing pigs a diet containing 6% fresh tomato pomace resulted in a significant increase in feed consumption compared to those receiving a standard commercial mash. 2. Citrus by-products: Citrus fruits encompass several significant varieties, with the most notable being the orange (Citrus sinensis), lemon (Citrus limon) and grapefruit (Citrus paradisi). The by-products derived from citrus processing are affected by various factors, including the fruit’s origin and the method of processing employed. Consequently, the nutritional value of these by-products varies based on the type of waste and the specific fruit involved. The citrus by-products contain 1.7-7% TA, 1.2-2.1% EE, 5.7-8.6% CF, 2.2-4.2% CP, 65-75% NFE, 10.2-16.5% total sugar, 1.3-6.5% lignin and 4.4-12.8% pectin. Fresh citrus pulp waste is considered palatable for cattle, with a consumption capacity of up to 10 kg per day. Dried citrus pulp can be incorporated into animal feed at levels as high as 45% of the total ration. However, it is important to note that the digestibility of this feed in sheep diminishes when the inclusion exceeds 30%.

Roots: The main distinguishing characteristic of roots is their high moisture content, which may vary from 75 to 90 percent. Their CF content ranges from 4 to 13 percent. The organic substance of the root is highly digestible and mostly composed of sugars (50-70% DM). Glucose and sucrose is the primary sugar. Although the CP content of roots is often low, the rumen’s protein degradability is extremely high (80-85%). Mangles, swedes, turnips, carrots, sugar beets and fodder beets are among the most popular root crops used to feed farm animals. Although sugar beet is a significant root crop, it is typically not fed to animals as such because it is cultivated largely for its sugar content. Nonetheless, sugar beet pulp and molasses (from both sugar beet and sugarcane) are significant and nutrient-dense animal products that are by-products of the sugar extraction companies. Although pigs are fed roots with higher DM concentrations, like fodder beet, they are not a favourite diet for pigs or poultry due to their bulkiness. 1. Swedes and turnips: Turnips (Brassica campestris) & swedes (Brassica napus) share a lot of chemical similarities, but turnips typically have less DM than swedes. Glucose and fructose are the primary sugars found. 2. Turnip (Brassica rapa): Turnips are root vegetables of cruciferous family. They are usually grown in temperate climates. Humans like a smaller variety, while animals are provided a larger variety. It has 8–10% DM, 12–13% CP and 75–80% TDN. Cultivars with yellow flesh have higher protein content than those with white flesh. Instead of passing through the animal, the volatile material that taints milk is absorbed by the milk from the air. Both turnips and swedes can taint milk if they are offered to dairy cows during or just before milking time.

Definition of silage: Silage refers to the product obtained when fresh, high-moisture green fodder undergoes fermentation in a controlled anaerobic environment. This process generates volatile fatty acids that help preserve the green material for an extended period. Ensiling: The act of preserving green fodder as silage is termed ensiling Silo: A silo is a sealed container designed for the preparation of silage. In India, pit silos are commonly used, typically measuring 2.4 to 3 meters in depth. For every cubic meter of space, approximately 400 kg of fodder can be accommodated, while a cubic foot can hold between 18 to 22 kg of fodder in a pit silo. Other types of silos include trench silos, bunker silos and tower silos. In rural areas, katcha silos are often constructed by excavating a pit or trench in the ground, with the walls and floor usually coated with a mixture of cow dung and clay in a 1:1 ratio. Crops suitable for silage making: Crops that are high in soluble carbohydrates are ideal for silage production. Suitable options for ensiling include maize, sorghum, pearl millet, Napier grass and oats. Leguminous fodder crops are generally not suitable for ensiling unless they are combined with carbohydrate-rich fodders in a ratio of 1:3. The recommended ratio of green, succulent fodder to dry straw is 4:1 and the crops should contain approximately 30-35% dry matter at the time of ensiling. Hollow-stemmed plants are typically unsuitable for ensiling due to the air trapped within the stems; however, if the stems are trampled, they can yield good silage. To effectively ensile cultivated or natural grasses an addition of 3-3.5% molasses is necessary. Grasses and legumes present challenges for ensiling; grasses tend to be low in soluble carbohydrates, while legumes possess high moisture content, elevated protein levels and increased mineral content, which enhance their buffering capacity and resistance to pH fluctuations. Harvesting: The crop should be harvested between flowering and milk stage as they contain maximum amount of nutrients at that time. Crops with thick stems are suitable for silage making whereas thin stemmed crops are conserved for hay making.

When green forages are dried to approximately 85% dry matter, they retain a significant portion of their nutrients, including carotene, and are referred to as hay. Compared to straw, hay is both more nutritious and more palatable. High-quality hay should exhibit a leafy structure, be pliable, possess a green colour and be devoid of mold, weeds and dust, while also emitting a pleasant fragrance. It is essential that the moisture content does not exceed 15% (ideally between 12-14%) to ensure safe storage without the risk of fermentation or combustion. Objectives of hay production The primary goal of hay production is to lower the moisture content of green fodder to a level that effectively inhibits the activity of both plant and microbial enzymes. Benefits of hay production • Hay serves as a nutritious feed source for livestock during periods of scarcity. • High-quality legume hay can substitute for concentrates, thereby lowering production costs. • Fodder can be harvested at optimal times to maximize nutrient accumulation in the plants. Crops suitable for hay production: Fodder crops with soft and flexible stems are ideal for hay production. Green oats are considered the best option for this purpose. Other suitable crops include green berseem, lucerne, cowpea, stylo, and various natural grasses, provided that leaf shattering is minimized. Both annual and perennial grasses, such as anjan, doob, rhodes, and sudan grasses, are also appropriate for hay making. However, cultivated cereal fodders like maize, sorghum and bajra are better suited for silage production than for hay. If using thick-stemmed crops for hay, it is necessary to chop or crush them into smaller pieces.

Plants and many agro-industrial by-products incorporated into livestock diets may harbor a range of anti-nutritional compounds. These substances can adversely affect optimal nutrition by deactivating specific nutrients, obstructing the digestive process, or diminishing the metabolic efficiency of feed, ultimately leading to negative consequences for animal health and productivity. The naturally occurring plant compounds found in feed that disrupt feed utilization (FCR), lower production levels, and compromise animal health are referred to as anti-nutritional factors. Additionally, natural toxicants present in feed can hinder the absorption and utilization of nutrients in livestock. Therefore, it is essential to implement effective detoxification methods for these feed materials to mitigate toxic effects and ensure their safe incorporation into animal diets. A foundational understanding of these toxicants is crucial prior to undertaking detoxification and subsequent use in livestock feeding. Natural toxicants can be categorized based on their chemical properties into several groups: Proteins, Glycosides, Phenols, and Miscellaneous toxicants. The chemical characteristics, pathogenic effects, and detoxification strategies for these compounds are briefly outlined below. Proteins 1. Protease inhibitors: Protease inhibitors are prevalent throughout the plant kingdom, particularly in the seeds of many cultivated legumes. These inhibitors possess the capability to obstruct the function of proteolytic enzymes in the gastrointestinal systems of animals. Specifically, trypsin inhibitors form irreversible complexes with trypsin, rendering the enzyme unable to fulfill its role in protein digestion. This interaction prompts the intestine to secrete cholecystokinin, which in turn stimulates pancreatic enlargement. The presence of trypsin inhibitors in raw soybean can hinder the availability of methionine, leading to adverse effects in young chickens fed raw soybean meal, including pancreatic hypertrophy, reduced growth rates, gallbladder contraction and increased bile acid excretion, similar to observations in other monogastric animals. In contrast, ruminants can effectively utilize untreated leguminous seeds. Consequently, the amino acids that would typically be released by trypsin are not reabsorbed, leading to their loss when trypsin interacts with these inhibitors. These substances, which are proteinaceous in nature, hinder the activity of certain digestive enzymes, ultimately impairing the growth and performance of non-ruminant animals. High concentrations of protease inhibitors are found in various leguminous seeds, such as soybean, kidney bean and mung bean. There are two primary types of protease inhibitors: a) Kunitz inhibitors, which possess a single active site that binds exclusively to trypsin and b) Bowman-Birk inhibitors, which contain two active sites that can bind both trypsin and chymotrypsin, thereby inhibiting both enzymes. Detoxification: These protease inhibitors are primarily heat-sensitive and appropriate heat treatment of leguminous seeds-such as roasting, toasting, popping, autoclaving (at 120°C and 15 lbs psi for 20 minutes), and cooking-can effectively inactivate them. It is important to avoid overheating during these processes.

Straws consist of the stems and leaves that remain after the threshing of mature seeds. These materials are characterized by their high fiber content and lignin, while offering minimal nutritional benefits. Straws are primarily utilized as feed for ruminants, rather than for monogastric animals such as pigs or poultry. Paddy and wheat straw: These are byproducts of grain harvesting and are commonly used as a primary feed source for cattle and buffalo. Their nutritional profile is low, with approximately 3-5% CP and 40% TDN. They are deficient in essential minerals, vitamins, fatty acids, and proteins. Paddy straw contains about 6-7% lignin in its dry matter, which is lower than that found in other cereal straws. However, it has a high ash content (17% of dry matter) and elevated silica levels. Notably, the stems of paddy straw are more digestible than the leaves. The addition of urea can enhance the feeding value of straw, although the high lignin content may diminish its palatability. Urea treated rice straw contains around 8.1-9.5% CP (normal level is 3.5-5.3%) where as urea treated wheat straw contains around 8.5-9% CP (normal CP is 2.63-4.20%). Additionally, paddy straw contains significant amounts of oxalic acid, which can hinder calcium absorption in the gastrointestinal tract of ruminants, while also contributing bulk to their diet. Barley straw: It has a nutritive value comparable to that of oat straw, but it presents challenges due to the presence of barbed beards. Its composition includes 0.30% DCP and 48% TDN. Oat straw: It is regarded as one of the superior options for cattle feed, being soft, palatable and more nutrient-rich than other straw types. On average, it contains 0.3% DCP, 48% TDN, 0.38% Ca and 0.07% P. Pulses straw: These includes varieties such as black gram, green gram, moth bean, pigeon pea and cow pea, is relatively palatable and nutritious for cattle. Among these, black gram, green gram and moth bean straws are particularly noted for their palatability and nutritional value. While the energy content of these straws is similar to that of cereal straws, they tend to provide a better source of digestible protein. For high milk-producing cattle, supplementation with energy-dense feeds like cereal grains is often necessary.

Straw represents a category of low-density feed characterized by a high concentration of structural carbohydrates, specifically cellulose and hemicellulose, while exhibiting low levels of carbohydrates, nitrogen and minerals, along with variable lignin content. Lignin serves as a physical barrier, inhibiting the microbial degradation of these materials. Straw is having low digestibility due to following reasons: • Reduced voluntary intake due to unappealing taste. • Low digestibility and nutritional value. • Nutritional deficiencies, particularly in crude proteins, essential minerals, and vitamins. • The presence of anti-nutritional components such as lignin, silica, tannins, and oxalates. The primary aim of treating low-quality roughage includes: • Enhancing voluntary intake by improving palatability. • Increasing digestibility to boost the intake of digestible energy. • Minimizing losses during digestive processes. • Breaking down cellulose and hemicellulose from lignin and silica to enhance digestibility. • Expanding the surface area available for microbial action and enzyme activity, thereby improving digestibility. • Reducing bulkiness through densification. The processing of low-quality roughages can be achieved through various methods.

Dry Methods 1. Decortication and dehulling: The process of decortication for groundnuts and cottonseeds enhances the nutritional profile of the resulting cakes by eliminating the outer layers, which are notably high in crude fiber. Similarly, dehulling or dehusking of pulses and grains also contributes to an improved nutritional value. 2. Cracking and dry rolling: This technique involves the fragmentation of the kernel into smaller particles through the application of pressure using dry rollers. This method increases the surface area of the grains, thereby enhancing their digestibility. 3. Crimping: In this method, the traditional rolling of grains is substituted with the use of corrugated rollers, a process referred to as crimping. 4. Crumbles: The term “crumble” refers to the process of grinding pellets into a granular form, which is particularly beneficial for chick feed. 5. Popping or puffing: This technique involves the dry heating of grains, which must contain a moisture content of 10-14%. The final moisture content in the popped grains is approximately 3%. During this process, grains are subjected to temperatures ranging from 370 to 425 degrees Celsius for 15 to 20 seconds, leading to the rupture of the endosperm due to the rapid expansion of steam. This results in an increase in grain size and enhances both palatability and digestibility. 6. Micronizing: This process employs infrared heat energy on grains, resulting in the breakdown of glucosidic bonds between starch molecules. 7. Roasting: In roasting, grains are exposed to direct flames at a temperature of 148.9 degrees celsius. This method not only expands the grains but also inactivates protease inhibitors in whole soybeans, thereby improving their nutritional quality.

Natural disasters frequently lead to significant shortages of animal feed, a common challenge faced by livestock owners. Events such as earthquakes, landslides, heavy rainfall, flooding, droughts, and cyclones can severely impact the well-being of livestock. Intense rainfall is often the primary factor contributing to both flooding and landslides, particularly in the hilly regions of India, where such landslides are a regular occurrence. The essential components of animal feed include both green and dry roughages, with dried roughages, such as straw, constituting approximately 60 to 80 percent of the total dry matter intake for livestock. Unfortunately, the occurrence of landslides or floods can abruptly disrupt transportation networks, including roads and railways. Consequently, livestock owners are compelled to rely on locally available unconventional feed sources during these challenging times. Unconventional Feed Resources: In periods of resource scarcity, various unconventional indigenous ingredients can be employed. Such times may see the utilization of materials like tapioca, jackfruit, pineapple waste, sugarcane bagasse, rice bran or rice polish, water hyacinth, rubber seed cake, chicken litter and droppings, tea waste, urea and molasses, all of which can serve as valuable feed components. In comparison, low-quality rice straw and fallen leaves from trees are the predominant roughages, constituting approximately 60 to 70 percent of the total feed for cattle. The main sources of roughage during scarcity typically include straws from cereals or pulses, fallen leaves, dried grasses and foliage from forests and jungles. The collection or harvesting of roughages can be challenging due to their bulk, particularly in the case of forest leaves. Additionally, the volume of these materials presents significant transportation challenges. Consequently, chaffing roughages at the harvesting site emerges as the most effective solution for facilitating transport and minimizing costs. The densification of chaffed roughages further enhances their transport efficiency. Chaffing roughage is essential for the preparation of complete feed blocks (CFB) and total mixed rations (TMR).

non-herbaceous plants that are accessible for animal foraging. Flour: It is soft, finely ground meal of a grain which mainly consists of gluten and starch. Fodder: Fodder covers various agricultural products specifically intended for the nourishment of domesticated animals. The term “fodder” is particularly associated with the provision of food to these animals, which may include plants that are harvested and delivered to them, as opposed to the food they gather independently through foraging. Any green plant or crop meant for animal feeding for supply of nutrients and bulk. Forage crop: A crop of cultivated vegetation or portions of plants, excluding detached grains, that is grown specifically for grazing or harvesting to serve as animal feed. Forage and roughage these two terms are used interchangeably. Forages include hay, straw, silage and pasture while roughage include rice husk, groundnut shells. Forage crops: It denotes the wild as well as cultivated green plants used for feeding of domestic animals like cattle, buffaloes, goat, sheep, horses, etc. Forage: Forage includes consumable plant materials, including grasses, legumes, herbs and shrubs, as well as hays and silages. These materials are either grazed or ingested by livestock to meet their nutritional needs and dietary requirements within agricultural ecosystems. Germ: It is the embryo of any seed. eg. Wheat germ meal (25% CP and 7% EE) Gluten: When flour is washed to remove starch, a tough, viscid nitrogenous substance remains which is known as gluten. eg. Corn gluten. Herbage: Herbage denotes the various plants, grasses, or vegetation that are specifically designated for the nourishment of livestock. This term generally encompasses the softer, green portions of plants that are appropriate for animal grazing.