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Operation Flood and dairy cooperatives became India’s greatest rural employment programme, enabling the modernization of the dairy industry to a point from where it may take off to fulfill the need for milk and milk products within the nation as well as chances on the international market. An unorganized sector handles 80% of the milk a rural producer produces, and an organized sector handles the remaining 20%. It has been discovered that dairy cooperatives significantly contribute to reducing rural poverty by increasing rural milk production and marketing.

Letting the cow to release its milk so the dairy farmer can extract it for personal use or to sell is the procedure of milking. Consequently, it is not totally a natural process. The natural process must be manipulated by the dairy farmer to his advantage. Therefore, in order to control the natural process, one must first understand it. The process of producing milk from blood-derived basic materials by alveolar cells and storing it in the alveolar cavity is known as milk secretion. Only when the alveolar cavity is full and the pressure on the alveolar cells prevents further secretion does this continuous process come to an end.

Animals need to function efficiently during reproduction in order for a dairy production system to be sustainable. This is necessary to produce milk, the primary product of interest, as well as to supply replacement animals. From the perspective of reproduction, delayed puberty, lengthy calving intervals, limited productive lives, and high calf mortality are the key variables that cause economic losses. Reproductive management’s proportionate contribution to the effectiveness of dairy production systems varies greatly.

Dairy farmers hope to have better milking cows than those in their current herds. A solid foundation is necessary for every farming operation. Undoubtedly, the dairy farm documentation system is among the most important facets of farm management. Tracking each cow’s productivity within a herd and assisting breed development generally are the major objectives of a dairy farm tracking system. This information could be referred to as production data.

By minimizing the harsh climate effects like heat, cold and rain, it is crucial to offer the proper circumstances for raising dairy cows in the tropics. Stress can be reduced through the design of the farm and the dwelling. Controlling the environment lowers the risk of stress and disease, improves management, and increases milk production.

Dietary fat, which is not degraded in upper part of digestive tract (rumen) of animal, but gets digested in lower alimentary tract is known as bypass fat. Rumen protected fat is another name for this bypass fat. Immediately following calving, dairy animals lose a significant amount of energy through milk, although their feed intake is decreased. Animals continue to have negative energy balances as a result.

For the purpose of passing into the lower gastrointestinal tract and supplying the cow with vital amino acids, dairy bypass protein (UDP – undegraded protein) is a type of animal or plant-based protein that resists breakdown in the rumen. More metabolizable protein is made available by avoiding the rumen, assisting the cow in meeting her needs for amino acids for milk production and its constituent parts.

In terms of their contribution to human nutrition, the dairy industry is very important. Since dairy farming has the ability to offer meaningful selfemployment and stable income, it is a dependable source of subsistence for the rural poor. Additionally, it requires less labour and cash to maintain. Dairy cattle feeding directly affect the animals’ ability to reproduce and produce. Therefore, the addition of a mineral mixture is necessary to maximize the animal’s productivity and milk output.

The proper supply of feed and fodder is a requirement for the growth and development of the animals. Over the past few decades, there has been a considerable growth in milk production, with India now producing the most milk in the world (187.7 million tones in 2018–19). The main causes of India’s low milk yield are extrinsic (poor nutrition/feed management) as well as intrinsic (low genetic potential).

Herd management practices in the handling, nutrition, milking techniques, sanitation, and housing of dairy animals play key roles in predisposing the individual animal as well as herds to diseases. The key factor influencing the reduction of health issues are the decisions made by herd managers or animal owners.In order to maximize output and profitability through disease control, herd management approaches in conjunction with a veterinarian programme can be most beneficial.

Dairy farmers are faced with a number of fundamental inquiries. The first inquires as to what dairy animal he needs to keep. Is the breed with the best production performance the one that has adapted to the local environment the most? What animal is the best, asks the second? Is it the one with a showwinning conformation or the one with a strong ancestry? Is the ideal dairy cow one that produces the most milk, has the best feet, legs, and udder support, or combines the performance of these characteristics in the best possible way?

India is home to an enormous number of buffalo. According to the 20th Livestock Census, more than 109 million buffaloes, or more than 56% of the world’s population, are living in India. With 20 recognized breeds, it also has a very diverse collection of buffalo genetics. One of the most well-known buffalo breeds in the world, the Murrah, is also found in India. The buffalo is a versatile animal that can be used for milk, meat, and draught. India is the world leader in this industry, producing 76% of the world’s buffalo milk.

Harvesting is a complex operation that can be divided into three major parts, as follows:

Driving and concentrating the fish stock to the catch basin;

Lifting the fish out of the catch basin and placing them on a sorting table;

Sorting the fish and loading them on the transporting vehicle.

Aeration is the addition of oxygen or air containing oxygen to water. Any aquatic species important for commercial purpose requires oxygen. Even photosynthetic plants need oxygen when it is dark.

2.1 Need of aeration

Rise in atmospheric temperature causes increased rate of biological degradation of organic matters and subsequent depletion in dissolved O₂ concentration in water.

The oxygen content may be measured either chemically or electronically. The normal chemical method is the so-called Winkler method which is a titration method, consisting of adding certain chemicals to the water and observing a colour change which will be directly related to the oxygen concentration.

Material handling includes a number of operations that can be executed either by hand (manual) or by mechanical means or devices to convey material and to reduce the human drudgery.

The most common types of mechanical devices for grain handling are;

Filtration may be defined as the separation of a mixture or solution into component parts. The resulting components may be pure or may be solutions or mixtures. In water/wastewater treatment filtration technique is used for removing suspended solids, dissolved solids and organic matter.

The feeding is an important operation in aquaculture, it is the process of providing nutritious supplements or live feeds to the culture animal. The equipment used for this purpose is named as feeders. Equipment that is connected with fish feeding can be divided into three major groups, as follows

Pump is a mechanical device to increase the pressure energy of fluid. Aquacultural enterprises often find it necessary to move fluid against an energy gradient. Most commo n may be filling or emptying of tanks. For performing an assigned job, the best selection of pumps should be such that it should work at its peak efficiency. Unfortunately, there is only one head and discharge condition for each pump where the peak efficiency is obtained and therefore, it is rarely possible to achieve the highest efficiency for a pumping condition. Manufacturers cannot design and build so many varieties of pumps to meet all operating conditions. They have therefore, settled upon some standard designs which are generally required for most of the head and discharge conditions.

Soil, climate and water decide the nature of crop to be grown in a particular region. While soil and climate can be manipulated to certain extent, there is no substitute of water. Water is governed by the hydrological cycle. The major source of water is rainfall which has been reduced over the years due to climate change. The per capita water availability in India was 4944 m3 in 1955 which has been reduced to 1750 m³ now and is expected to come down to 1500 m³ by 2025.