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The potential value of any feed for supplying a particular nutrient can be determined by chemical analysis but the actual value of the feed to the animal can arrived at only after making allowances for inevitable losses that occur during digestion, absorption and metabolism. The first tax imposed on feed is that represented by the part of it which is not absorbed and excreted in the feces.

4.1 Ration and balanced ration

A ration is the feed allowed for a given animal during a day of 24 hrs. The feed may be given at a time or in portions at intervals. Balanced ration may be defined as the ration that provides all essential nutrients to the animal in such a proportion and amounts that are required for the nourishment of the particular animal for 24 hrs.

Developments of feeding standards

Feeding standards are statements or quantitative descriptions of amounts of one or more nutrients needed by the body. Since the beginning of nineteenth century, scientists worldwide started formulation of standards for feeing the livestock and poultry and as such with the advancement of science the standards were developed from time to time. For convenience all such standards are grouped under major 
3 headings based on principles of standards. These are comparative type, digestible nutrient system and production value type.

Every nutrient has its specific functions to play in the biological system. As we know there are six nutrients i.e., water, carbohydrate, protein, fat, minerals and vitamins and each of these have different functions, it will be discussed separately for each nutrients.

2.1 Water

Water is the ideal dispersing medium because of its solvent and ionizing powers which facilititates cell reaction and due to its high specific heat which helps to absorb the heat of these reactions with a minimum rise of temperature. Lean adult body contains about 70 percent of water, though the amount varies from embryo to mature animals.

1.1 Introduction

Agriculture and allied sector contributes nearly 18 percent of gross domestic product in Indian economy and more than 70 percent population is dependent on agriculture and allied sector. In this sector, livestock is an integral part and it provides essential commodities and livelihood to the majority of its population. Livestock sector provides sustainability and stability to the national economy by contributing farm energy and food security. During last decade, the annual growth rate for livestock population maintained and in contrast the crop production remained stagnant or increased marginally. Between 1983 and 1999, the per capita consumption of milk increased by 37 percent and meat, egg and fish by 24 percent.

Potato is an important crop of the world and grown in almost all the states in India. Apart from India, potato is grown in more than 100 countries but the intensity of cultivation varies considerably. For example in the Netherlands 19.6% of the total arable land is cultivated with potatoes. The figures for Germany, Peru and USA are 10.1%, 5.6% and less than 1% respectively. India ranks fourth in area (1.29 m ha) and third in production (25.23 m ton) in the world. The productivity of potato depends mainly on the quality and quantity of planting materials and the agronomic management practices adopted. Most of developing countries including India experience release of high yielding varieties, development of adequate agronomic and pest control measures but the gap between supply and demand of good quality adequate quantity seed has to be the major constraint in increasing its productivity. The seed production in India is mainly confined to the North-Western part both in the hills and the plains, because of favourable weather and low incidence of aphids (vectors responsible for viral diseases) in this regions.

5.1 Jute Seed Production 

Jute ranks next to cotton as the most important natural fibre and it recognized as the ‘golden fibre’. Its products being biodegradable and environment friendly in contrast to synthetic substitutes, a renewed interest in this natural fibre has been generated in the recent past throughout the world. Important characteristics of jute fibre are its silky lustures, high tensile strength, low extensibility, considerable heat resistance. Because of its great abundance and shortage of cotton, jute is blended with cotton and jute/cotton blended yarns are produced mainly to take advantage of the lower price of jute fibre (Doraiswamy et al., 1998). Several diversified product is also made from jute. Since currently the paper industry has been using it as a raw material for paper. It is also being used in geotextile. The jute sticks are largely used as fuel and also for making gun powder.

4.1 Mustard 

The principle oil yielding rape seed & mustard sp. cultivated in India are

3.1 Redgram or Pigeon Pea

In any production programme, the importance of quality seed needs hardly be emphasized. In fact, the major bottleneck in the pigeon pea cultivation programme is the restricted or poor availability of quality seeds of the desirable varieties. The seed has been considered as the ‘vehicle of change’. With better attention paid to their interaction among water, fertilizer and seed of improved varieties, the production can be maximized. Although a numbers of improved varieties of pigeon pea have been released since 1970, organized seed production programmes have been rather limited. Most of our national efforts in this direction continue to be centralized on cereal crops like wheat, rice and hybrid millets. Moreover, the benefits of the current research will not reach the farmers unless large-scale seed multiplication programmes are organized. Most farmers continue to use seeds of traditional varieties and consequently have not been able to expedite the higher production potential of the new strains.

2.1 Rice

Rice is the staple food for the largest number of people on the Earth. According to an estimate, the global rice production must reach 800 million tonne from the present 91.04 million tonne in 2005-06 to meet the demand in 2025. It’s area is 37% of the total area under food grains as against 20% under wheat, another important food crop. But globally it stands next to wheat in harvested area.As the irrigated rice contributes more than 75 per cent of the total rice production, enhancing its yield potential would be key to meeting the global rice requirement for an additional 215 million tonne. To achieve the target yield, rice varieties with a yield advantage of about 20 per cent over popular and widely adapted rice varieties under tropical conditions must be developed. Experience in China, India, Vietnam, the Philippines, Bangladesh and several other countries clearly indicates that hybrid rice technology offers readily available option to meet this challenge.

Current Status of Seed Production

Organized seed production in the country became possible with the formation of National Seed Corporation (NSC) during 1963, which paved the way for a sound seed industry to come as a consequence of the introduction of hybrid technology during 1961-65. The release of high yielding dwarf varieties of wheat and rice by the 1960’s gave further impetus to the growth of the seed industry in the country. For the total area under cultivation of 26.7 m hac and 44.8 hac of wheat and rice respectively, the seed requirement for these two crops alone come to 32 lakh tones and 13 lakh tones respectively of which the varieties contribute about 98 per cent and the hybrids 2 per cent. Only about 10-15 per cent of the total requirement is met by the seed producers leaving the balance for the farmers to manage and the seed producers have to grab the opportunity to supply quality seed materials in order to increase the production.

    1.    Trocar and canula : It is used to remove the gas from the rumen during bloat. It should be inserted by sliding the skin through the left paralumbar fossa. (Fig. 18.1). Sliding of skin decreases the chances the formation of ruminal fistula after its removal.

    2.    Probang gag : It is made of a wooden piece with a hole in the middle and straps on either ends. Wooden block having the hole is fixed in the mouth and straps are fastened behind the horn at the poll. The probing is passed through the hole in to the stomach (Fig. 18.2).

Application of various methods of restraints is essential to carry out certain surgical procedures on animals. A particular method of restraint suitable for one animal may proves ineffective for another. Consider the temperament, Age, breed and individual characteristic of the animal as well as purpose of the restraint.

Many anesthetic drugs are available to immobilize the lab and wild animals. In wild animals, immobilizing agents are usually administered by intramuscular injection.

Common Anesthetic Agents used for Immobilizing Wild Animals

    1.    Ketamine
    2.    Telazol
    3.    Xylazine
    4.    Medetomidine
    5.    Carfentanil
    6.    Etorphine

General Description of An Animal
    1.    Age      
    2.    Sex                          
    3.    Body weight

Bandages
       Bandages are used to protect the wound and incisions, as well as support body parts.

       Bandages are also used to immobilize the limbs.

       Bandages are used to promote the wound healing process by :

        i.    Removal of dead and necrosed tissue from the wound (debridement).
        ii.    Application of topical antiseptics.
        iii.    Pressure to reduce the dead space, hemorrhage and edema.
        iv.    Preserving the hemostasis at the wound site.

Hemorrhage is a discharge of blood from the vascular system. Control of bleeding is of great importance because besides anesthetic problems the only disaster befalling the surgeon in the operating room is the result of hemorrhage.

Hemorrhage is Classified as
1. According to Source
Arterial : Blood is bright red and flows in spurts.
 
Venous : Blood is bluish red and flows freely. Capillary: Blood oozes under low pressure. 

The effects of anesthesia need to be monitored to prevent excessive insult to the cardiovascular, respiratory and central nervous system. 

1. Evaluation of Central Nervous System (CNS)
       Observe reflex activity to monitor degree of CNS depression. 

    Eye reflexes
        i.    Palpebral reflex 
        ii.    Corneal reflex 
        iii.    Position of eye ball 
        iv.    Nystagmus
        v.    Lacrimation 
        vi.    Pupillary reflex

Preparation of Patient for General Anesthesia
    1.    Check for feeding status of animal : Dogs should be kept off feed and off water 8-12 hours ruminants 24-48 hours, and horses 12-24 hours before surgery.

        Advantages
    a.    To avoid vomition and choking.
    b.    To avoid respiratory distress due to pressure of full stomach on diaphragm. 
    c.    To avoid gastric rupture.
    d.    While restraining, there may abdominal rupture.
    e.    Prevent increase in BMR.
    2.    Complete blood count like PCV, Hb, DLC and blood chemistry should be undertaken. 

General anaesthesia can be induced by parentral anaesthetics or by gaseous or inhalation anaesthetics. 

Apparatuses

    1.    Syringes : Disposable plastic syringes of different capacities e.g. 1ml, 2ml, 5 ml, 10 ml, 20 ml and 50 ml.
 
    2.    Hypodermic needles : They are of different sizes e.g. 16, 18, 20, 22, 24 gauze. They must be sharp with short bevel to reduce risk of transfixing the vein.
 
    3.    Catheters : They are used for constant infusion of drug or for administration of intermittent small doses of drug. 

Restraining means use of strong force or chemical agents to prevent or suppress or to control the action of animal for clinical examination or for prevention of self-injury and for performing surgical interventions.
 
Restraining can be performed by:
    1.    Psychic persuasion 
    2.    Physical restraint 
    3.    Chemical restraint

Catheters are hollow tubes made up of rubber, gum elastic, polyethylene or teflon or metal and are indicated.
 
    1.    To evacuate fluid from the body cavity.
 
    2.    To collect fluid sample from the hollow organ.
 
    3.    To administer medication inside a hollow organ.

    1.    Molar tooth cutter :  It is used to cut the extra sharp molar tooth in large animals (Fig. 7.1).

These instruments are used for different surgical conditions of hoof.
 
    1.    Drawing knife: It is used to remove excess sole and trimming of horny tissue (Fig. 6.1). 
    2.    Hoof plane: it is used to plane the surface of the hoof. 

These instruments are used for surgery and need special care and attention for sterilization and storage.
 
    1.    Strabismus scissors : It is used for treating strabismus i.e. sectioning of affected muscle.
 
    2.    Me Guire corneal scissors : It is used for incising cornea
 
    3.    Graefe’s eye speculum : It is used for retraction of eyelids for examination of eye or for ophthalmic surgery.
 
    4.    Ziegler knife needle : It is used for separation of ocular tissues during ophthalmic surgery.
 
    5.    Iris hook : It is used for handling of Iris drug ophthalmic surgery.
 
    6.    Tenotomy scissors : It is used either for cutting the ocular ligament of eye or for removal of ocular sutures.
 
    7.    Dressing forceps : It is used for manipulation of eyelids, 3rd eye lid and other tissues of the eye.

These specialized instruments are used for operation of skeletal system. Common instruments are as follows :

    1.    Loman bone holding clamp : It is used for holding fractured bony ends with bone plates.
 
    2.    Bone plates : are used for rigid immobilization of fractured fragments. Bone plates are of difference shapes, sizes and with varying number of holes. These are of following types :
 
        a.    Dynamic compression plate.
        b.    Neutralization plate.
        c.    Shcrnab plate etc.
 
    3.    Bone screws : are either used to immobilize fractured fragments or to fix bone plates. They are of different sizes and classified in to cancellous and cortical types.

1.    Milking tube : It is used for milking the animal after udder or teat surgery. It can also be used for infusing intramammary medication through teat canal.
 
 2.    Teat plug : It is used to plug the teat in cases of leaky teats or trodden teats or following operation at teat sphincter. It can also be used for retaining medication in the teat canal.
 
 3.    Udder infusion tube : It is used for infusion of medication in the udder/teat.

 4.    Teat slitter with concealed blade : For cutting any growth inside the teat canal without injury to the teat.
 
 5.    Teat tumor extractor : It is used for removal of teat tumour or polyps from the teat canal. 

Surgical pack : It is sterilized bundle containing the conventional surgical instruments and drapes etc. required for routine surgical operation.
 
Common surgical instruments: These instruments are used in routine general surgery and made up of stainless steel. Stainless steel not only has excellent strength but also resistant to corrosion. The general instruments are:

    1.    Towel clamp : It is used to hold the drape in position. It has pointed ends so that drape does not slipped away from the area of operation. Small amount of skin is grasped to secure the drape. It is of two types :

    a.    Backhause towel clamp
 
    b.    Cross action towel clamp

    2.    Bard Parker knife / scalpel (B.P. handle with blade) : Bard Parker knife is available as disposable knife. BP handle is available with changeable blades.

Acus means needle. It is an ancient Chinese system of therapy utilizing long fine needles at specific points and their stimulation by various means to induce analgesia and to cure certain diseases. The specific points are known as acupuncture points or acupoints.
 
The procedure is safe. There are no post anaesthetic complications and can be used in poor surgical risk patients. The major disadvantage is poor muscle relaxation. Acupuncture has been used to produce local anaesthesia.
 
Acupoints : Alphanumeric code system is used to recognize the acupoints universally e.g. BL, LI, SP, GB etc means meridians of the urinary bladder, large intestine, spleen, gall bladder etc. respectively.

Local Anesthetic Techniques of Head Region
The following nerves can be blocked in the head region for performing surgery.
    1.    Cornual nerve block 
    2.    Peterson’s orbital nerve block 
    3.    Auriculopalpebral nerve block 
    4.    Supra orbital nerve block 
    5.    Infra orbital nerve block 
    6.    Retro bulbar nerve block 
    7.    Mental nerve block 
    8.    Maxillary nerve block 
    9.    Mandibulo alveolar nerve block 

These are the drugs that reversibly block the propagation of action potentials along nerve axons. General anesthesia may be advantageous where complete immobilization and relaxation of the patients required. However, local anesthetic techniques are advantageous for providing surgical anesthesia in animals that are considered at risk for inhalant or intravenous anesthesia. These drugs are injected directly at the target site.

Historical Aspect
    Curare was the first known muscle relaxant which was used by South American Indians to immobilize wild animals. Hence the term curariform has been applied to the action of this group of drugs. 
    In year 1958, a plant alkaloid alcuronium was introduced but there were difficulties in reversing the action of this drug.
    Succinylcholine was first used in 1906. However, its paralyzing property was discovered in year 1949.
    Pancuronium was introduced in 1964.
 

Endotracheal intubation is the placement of a tube in the trachea to provide a patent airway.

It is a valuable technique that enables to attach an animal to a breathing circuit or, just as importantly, to secure an airway during an emergency such as respiratory or cardiac arrest.

It is important that time be taken to learn the anatomy of the laryngeal area and the skill of intubation so that intubation may be performed quickly and with little chance of misplacement.

A sound understanding of general anesthetic emergencies and surgical techniques is vital for all practicing veterinarians. In most of the veterinary practices, after induction of anesthesia, no one is assigned the task of anesthetist to monitor anesthesia and occurrence of complications during surgery which may lead to the development of anesthetic emergencies. Onset of general anesthesia disturbs the physiological equilibrium of patient and increase the threshold of harmful events. The harmful events of anesthesia includes:

Advantages
    1.    These agents are primarily exhaled through the lungs and recovery is not dependent upon redistribution within the body and detoxification mechanisms. This is helpful in poor risk patient.
 
    2.    Anesthesiologist has good control over the anesthesia.
 
    3.    Early recovery of the patient.

    4.    Closed system available for thoracic surgery.

Injectable Anesthesia

Injectable anesthetics are the agents which are administered to the patient parentrally. They include drugs which are given intravenously to rapidly induce anesthesia in a patient. Single or combinations of drugs usually administered intramuscularly to patients which are difficult to handle. Injectable agents generally require less equipment and are easier to administer than inhalation anesthetics, but it must be remembered that once they are given to a patient they cannot be removed.

General anesthesia : reversible complete loss of consciousness along with analgesia. 
  Unconsciousness occurs due to depressant action or functional disruption by stimulation in brain by anesthetic agents.
  Analgesia is probably due to blockade of synaptic transmission in the dorsal horn of the spinal cord.

Preanesthetic agents are so named because they are usually given to prepare the patient for administration of an anesthetic agent for one or more of the following reasons:

    1.    To reduce the amount of general anesthetic needed and increase the margin of safety.
    2.    To calm the patient so that anesthesia can be administrated without fright or struggling. 
    3.    To reduce secretions of salivary glands (antisialogogue) and mucous glands of the respiratory tract, thus maintaining a free airway. 
    4.    To reduce gastric and intestinal motility and prevent vomiting while the patient is under anesthesia. 
    5.    To block the vagal reflex, thus prevent cardiac slowing or arrest (bradycardia).

  Term anesthesia by Dr Oliver Wendell Holmes (1886).
  Anasthesis (Greece Word) – absence of sensation.

History of Animal Anesthesia
  Paracelsus (1540) produced ether and reported it to have a soporific effect on fowl. 
  Sir Humphrey Davy (1800) suggested that N₂O might have anesthetic property. 
  Chloroform was discovered by Liebig in 1831.
  Dr. Horace Wells (1844) discovered the general anesthetic properties of nitrous oxide. 

Arterial diseases are important because of their serious effect on vital organs like brain, heart and kidney. Thrombosis is the most common complication of arterial diseases but hemorrhage and aneurysm formation may occur.

Luxation/Dislocation : It refers to the displacement of opposing articular surfaces of bone. The direction of displacement is described with reference to the distal bone in relation to the proximal bone.

Subluxation : It refers to partial or incomplete dislocation.

Classification
    1.    Acute : Recent occurrence of luxation.
    2.    Chronic : Luxation existing for a long time.
    3.    Recurrent : Reluxation after correction.
    4.    Simple : No open wound is communicating with the joint.
    5.    Compound : Open wound is communicating with the joint.
    6.    Pathological : Dislocation due to any pathological lesion.

Inflammation of the joint is known as arthritis.
Coxitis : Inflammation of hip joint.
Gonitis : Inflammation of stifle joint.
Omarthritis : Inflammation of shoulder joint.
Carpitis : Inflammation of carpal joint.

Sprain : It is defined as a joint injury in which fibers of supporting ligaments of the joint are ruptured by direct or indirect trauma. Depending upon the degree of ligament rupture, sprain can be classified as follows: 

It is defined as the reaction of living tissue to injury which begins following a sub-lethal injury to tissues and ends with complete healing. The purpose of inflammation is to destroy and remove the irritant and to repair the damaged tissue. 

Causes
    1.    Pathogenic organisms: Bacteria, virus, fungi, protozan and parasites.
    2.    Chemical poisons: Acid and alkalies. 
    3.    Mechanical or thermal injuries. 
    4.    Immune reaction: Antigen antibody reaction.

A hernia is the protrusion of an organ through a defect in the wall of the abdominal cavity in which it lies.

Classification
1. On the Basis of Anatomical Site
    Abdominal (umbilical and ventral)
    Diaphragmatic

Burn : Tissue changes due to excessive absorption of heat is known as burns.
Scald : A scald is a burn caused by moist heat and is usually partial thickness.

Etiology
       Dry heat
       Actinic rays (sunburn)
       Irradiation
       Moist heat
       Electricity
       Friction
       Dry heat causes desiccation and charring.

A wound is defined as a breach or disruption in the normal continuity of tissue in any body part. The wounds are mainly caused by physical, chemical or biological insult.

Dissolution in the continuity of bone/cartilage with or without displacement of fractured fragments is known as fracture.

Classification
1. On the Basis of Communication of Fractured Site to the Environment
    a.    Simple fracture : The fracture site does not communicate with the environment. 
    b.    Compound fracture : The fracture site communicates with the environment.  This type of fractures is more prone to infection. 
    c.    Complicated fracture : A closed fracture in which there is considerable injury to important neighboring vessels or nerves or accompanied by the opening of a joint or vascular cavity.

Shock is a life threatening condition which is usually manifested by serious pathophysiological abnormalities. In most cases it is due to poor tissue perfusion with impaired cellular metabolism.

       It is a clinical state resulting from an inadequate supply of oxygen to the tissues or an ability of the tissues to properly use oxygen.

       Shock can also be defined as imbalance between oxygen supply and oxygen consumption. In other words, the delivary of oxygen does not meet the needs of the tissues.

       Shock is a state in which the vital functions of the body are depressed because of acute reduction in cardiac output and effective circulating blood volume.

There is a delicate balance among electrolyte concentrations, body water and acid base status to maintain body homeostasis. Disturbances in homeostasis results in life threatening abnormalities. The aim of fluid therapy is to replace losses and maintain fluid and electrolyte balance in the body.