eChapters

The primary function of the digestive system include prehension of food material, its digestion, absorption, excretion of undigested material and
maintenance of internal environment. All the these functions are accomplished through the four major functions of the gastrointestinal system.

Liver is the largest exocrine gland located in right side of the abdominal cavity
obliquely from lumbocostal angle downward and forward to intercostal space,
about 3-4” (10 cm) above the abdominal floor.

The lymphatic system is an extensive drainage system that returns water and proteins from various tissues back to the blood stream. The system consists of
a network of very fine vessels or tubes called lymphatics that drain lymph from all over the body, and lymphnodes. Lymphatics are found in every part of the
body except the central nervous system.

Lymphnodes are found in every part of the body except

a) Digestive system b) Respiratory system

c) Cardiovascular system d) Central nervous system

The major functions of the musculoskeletal system to provide support to organs and help in physical activities including locomotion, prehension, and
mastication. The clinical manifestations of the diseases of muscles, bones and joints are much in common, and are generally characterized by lameness,
failure of support, in coordination of movement and deformity.

1 The clinical manifestations of disease of muscle, bones and joints are generally characterised by

a) Lameness b) Failure of support to stand

c) Incoordination of movement d) All of the above

The diseases that occur during the first one month of life are termed as diseases of neonates. During this period, the animal requires special attention to reduce
mortality rate. The clinical examinations that are applied to adult animals are being used for the examination of newborns.

1 Delayed post natal diseases occurs within _______ days after birth

a) 10 days b) 2-7 days

c) 2 days d) 15-30 days

The role of nervous system in animal is the maintance of bodies, speical relation with the immediate environment. Such functions are acomplished by several
sections of the nervous systsm. The sensory motor system is responsible for maintaing normal posture and gait.

1 Inflammation of meninges and spinal cord along with brain is called

a) Encephalomyelitis b) Encephalitis

c) Meningitis d) Meningoencephalitis

1 Defective oxygenation of blood in pulmonary circulation

a) Anaemic anoxia b) Stagnant anoxia

c) Anoxic anoxia d) Histotoxic anoxia

The functional efficiency of the respiratory system depends on the ability to oxygenate the blood and to remove CO2 as it passes in the respiratory
circulation resultant. Interference with this function can occur in a number of ways but the resultant defect in all cases is lack of adequate oxygen supply to
the tissues. The respiratory insufficiency like anoxia or hypoxia is responsible for most of the clinical signs of respiratory diseases leading to respiratory
failure and finally death.

Causes: Dietary causes like hypovitaminosis A, nutritional deficiency of vitamin B complex, linoleic acid. Iodine poisoning. Parasitic causes like flea, lice, mange infestation, ring worm.

Diseases of bladder and urethra are most commonly reported in farm animals than diseases of kidney. Knowledge of the physiology of the urinary secretion
and excretion is required to understand the urinary tract diseases. The functions of kidneys are to excrete the end products of tissue metabolism except CO2
and to maintain homeostasis with respect to fluid and solutes including acid base balance by selective excretion of these substances. The kidney maintains
homeostasis by varying volume of water and the concentration of solutes in the urine.

1 Homeostasis in kidney is generally maintained by

a) Glomerulus b) Renal tubules

c) Both (a) and (b) d) None of the above

A disease is any process which disrupts an animals’s normal function. Occurrence of diseases causes heavy economic loss in terms of livestock health and production. Presence and accumulation of infectious agents in the environment lead to reduction in quality and quantity of animal products. Strategic control and eradication of economically important diseases will result in enhancing goat production in the country. Goat suffer from many diseases although the susceptibility of goats to diseases is less as compared to sheep or cattle. Goat diseases can be bacterial, viral or parasitic. Viral diseases are more common in herds and are responsible for large scale mortality at one time. With a good hygiene in the barn and if the goats are kept in a way appropriate to their species, most of the diseases can be avoided.

Much attention has not been paid for prevention and control of goat diseases since most of the goats are reared by poor people and prevention and control is generally considered uneconomical. However, this is not true, as small investment in disease prevention and control can bring enormous gains in goat productivity. Simple preventive measures like deworming and vaccination alone can save the herds from heavy mortality and can increase production considerably. Serious and early efforts on diagnosis and prevention of goat diseases are essential in order to improve the health and production. A wide range of bacterial, viral, parasitic infections, causing heavy mortality and morbidity result in huge economic loss to different goat farming systems. Metabolic and nutritional disorders in goats also affect their production performance. Metabolic disorders are of great importance in pregnant goats, especially those carrying multiple foetuses. Deficiencies of essential minerals, metabolites and amino acids below the critical level also adversely affect the production. Therefore, it is necessary to avert these imbalances (calcium, magnesium, Co, Cu, Zinc, Iodine) in the ration. Provision for extra energy and protein in late pregnancy are necessary to avoid parturient paresis due to low blood sugar and high ketones and hepatic insufficiency of glycogen. Soil- plant- animal interactions in relation to the incidence of chronic deficiency diseases of goats are often being observed.

Introduction

Disorders of the hemopoietic system in poultry can significantly impact the health and productivity of these birds. The hemopoietic system is responsible for the production of blood cells, including red blood cells, white blood cells, and platelets. Disorders within this system can lead to various health issues, including anemia, immunodeficiency, and impaired blood clotting. Some of the common disorders of hemopoietic system include:

1. Anemia: Anemia is a condition characterized by a decrease in the number of red blood cells or hemoglobin in the blood. In poultry, anemia can be caused by various factors, including nutritional deficiencies (such as iron deficiency), infectious diseases (such as avian malaria or chicken infectious anemia), and parasitic infestations (such as blood-sucking parasites like leucocytozooncaulleryi, ticks, lice and mites).

2. Avian Leukosis:Avian leucosis is a viral disease caused by avian leukosis virus (ALV). It primarily affects young birds, causing tumors in various organs, including the spleen, liver, and bursa of Fabricius. Avian leukosis can lead to immunosuppression, anemia, and increased susceptibility to secondary infections. The avian leucosis diseases include lymphoid leucosis (affecting lymphoid cells), myeloid leucosis (affecting myeloid cells), osteoptrosis, etc. and can result in immunodeficiency, increased susceptibility to infections, and other systemic symptoms. It also affects blood-forming tissues, including the bone marrow and lymphatic system, leading to an overproduction of abnormal white blood cells.

Introduction

Poultry are domesticated birds mostly reared for the purpose of meat and egg consumption as well as for their feathers. It includes chickens, quails, turkeys, waterfowls, ducks and geese. The endocrine system of poultry consists of hypothalamic-hypophyseal complex, parathyroid gland, thyroid gland, pancreatic islet cells, adrenal glands, ultimobranchial glands, endocrine cells of gut and the gonads. These endocrine organs release hormones into the bloodstream. Peptide hormones act on the surface of cells, whereas steroid hormones act on target tissues by entering in the cytoplasm or nucleus of cells. Lack of diagnosis in the case of endocrinopathies is a major cause of production loss globally. Advancement in awareness, diagnosis, treatment as well as management is critical to ensure optimal flock health. Cost-effective programs of biosecurity and vaccination are required to prevent or limit the impact of disease. Programs of emergency treatment and long-term prevention are justified for severe endocrine diseases which have a profound impact on production.

Introduction

Eye

Avian ocular apparatus includes eyeball, optic nerve, and accessary structures e.g., eyelids, lacrimal glands, and muscles etc. The eyeball is composed of three tunics namely the f ibrous (cornea and sclera), vascular (choroid, iris, ciliary body) and nervous tunic (retina). The histological structures of all these tunics are similar to mammals except the Bowman’s membrane (the basal lamina of corneal epithelium) is not distinct. Similar to the mammals, they also have three refractive media viz., aqueous humour, lens, and vitreous humour. The cornea does not refract light.

There are some important diseases and disease conditions of eye in poultry birds. The common aetiology of eye diseases in poultry birds has a wide range and includes heredity, nutritional deficiency, infections (microbial and parasitic) and managemental failure. Some of them are not seen often in the modern intensive rearing systems like the deficiency diseases while others are seen associated only with the intensive system housing of birds like the ammonia burns. The infectious diseases of only eyes, are not encountered in poultry birds. The diseases like the colibacillosis, pasteurellosis and Marek’s disease can affect eyes along with other body systems. Understanding of eye diseases of poultry birds requires basic knowledge of ophthalmic anatomy, concepts and terminology of eye associated pathological changes. The affected birds generally show ocular lesions and loss of condition due to starvation as they are unable to search for feed and water. Some conditions are reversible while others may be irreversible according to the extent of damage. Nutritional and managemental diseases in most cases are relatively easy to diagnose and manage, while infectious and hereditary diseases may require deeper investigation. Some diseases like endophthalmitis, eye notch syndrome and ophthalmopathy have been recorded but their causes could not be found out.

Etiology

 Acral lick dermatitis is usually observed on extremities of dogs and the probable etiology is persistent licking. It is also caused due to self-trauma or mutilation.