All Free Veterinary Science MCQs with Answers

• A. Keeping litter moist and compact
• B. Increasing stocking density during winter
• C. Improving ventilation and litter dryness
• D. Reducing access to drinking water

Explanation: Ammonia forms when uric acid in manure is broken down, especially under wet conditions.

• A. No mature ovarian follicles after hatching
• B. Two equally functional ovaries and oviducts
• C. A functional right ovary and left oviduct
• D. A functional left ovary and left oviduct

Explanation: In most domestic hens, the left ovary and left oviduct develop functionally, while the right reproductive system remains greatly reduced.

• A. Paired ceca
• B. Gizzard
• C. Proventriculus
• D. Small intestine

Explanation: The paired ceca contain microbes that ferment some undigested carbohydrates and fiber.

• A. Germinal disc of the yolk
• B. Stigma of a mature follicle
• C. Infundibulum of the oviduct
• D. Medullary bone cavity

Explanation: Ovulation occurs when the mature follicle ruptures at the relatively avascular stigma.

• A. To accelerate skeletal growth beyond genetic potential
• B. To increase fat deposition before sexual maturity
• C. To prevent excessive body weight and improve reproduction
• D. To eliminate the need for a lighting programme

Explanation: Controlled feeding keeps breeder pullets near the target body-weight curve and supports better reproductive performance.

• A. Thymus
• B. Cecal tonsils
• C. Spleen
• D. Bursa of Fabricius

Explanation: Infectious bursal disease causes lymphoid depletion in the Bursa of Fabricius, particularly affecting developing B-cell populations.

• A. Xanthophyll pigments
• B. Sulfur amino acids
• C. Calcium phosphates
• D. Medium-chain fatty acids

Explanation: Xanthophylls from ingredients such as maize and alfalfa are deposited in the yolk and deepen its yellow colour.

• A. Reduced respiratory rate
• B. Panting with increased respiratory rate
• C. Marked shivering with vasoconstriction
• D. Complete cessation of water intake

Explanation: Chickens lack functional sweat glands and lose heat mainly through respiratory evaporation, so panting increases during heat stress.

• A. Infectious laryngotracheitis virus
• B. Eimeria tenella
• C. Mycoplasma gallisepticum
• D. Fowl pox virus through mosquitoes

Explanation: Mycoplasma gallisepticum can be transmitted vertically through the egg, producing infected progeny and respiratory disease.

• A. To sterilize the poultry house environment
• B. To give immediate passive antibodies from another bird
• C. To replace all biosecurity measures on the farm
• D. To provide active immunity using a weakened organism

Explanation: A live attenuated vaccine stimulates the bird's own immune system while using an organism weakened in disease-producing ability.

• A. Insufficient loss of egg weight and a small air cell
• B. Excessive loss of egg weight
• C. Premature closure of the shell pores
• D. Complete prevention of yolk formation

Explanation: High humidity reduces water loss from the egg, leaving the egg heavier and the air cell smaller than expected at hatching.

• A. Feather sexing
• B. Vent sexing
• C. Autosexing by plumage colour
• D. Ultrasonic sexing

Explanation: Vent sexing determines sex by examining the cloacal region for sex-linked anatomical differences in newly hatched chicks.

• A. Plymouth Rock
• B. Cornish Cross
• C. White Leghorn
• D. Rhode Island Red

Explanation: White Leghorn has been selected primarily for high egg production and efficient feed use.

• A. Uterus
• B. Magnum
• C. Isthmus
• D. Infundibulum

Explanation: The infundibulum is the funnel-shaped first part of the oviduct that catches the ovulated ovum.

• A. Panting
• B. Sweating
• C. Shivering
• D. Hibernation

Explanation: Chickens lack functional sweat glands over most of the body, so they mainly cool themselves by panting and increasing evaporative heat…

• A. They lack haemoglobin
• B. They retain a nucleus
• C. They are always spherical
• D. They contain no cell membrane

Explanation: Mature avian erythrocytes are oval and retain their nuclei, unlike mature mammalian red blood cells.

• A. Nervous tremors from low vitamin E
• B. Rickets from poor calcium use
• C. Poor epithelial integrity
• D. Perosis from manganese deficiency

Explanation: Vitamin A is important for normal epithelial tissues, vision, immunity, and reproduction, so deficiency can produce poor epithelial…

• A. Sodium chloride
• B. Limestone powder
• C. Fish meal
• D. Maize grain

Explanation: Maize grain supplies substantial metabolizable energy through its starch and is widely used in poultry diets.

• A. Drinking water
• B. Intramammary injection
• C. Subcutaneous udder injection
• D. Rectal infusion

Explanation: Live Newcastle disease vaccines are commonly given through drinking water, spray, or eye-drop methods, depending on the product and flock…

• A. Improved feather growth
• B. Footpad dermatitis
• C. Reduced bacterial survival
• D. Lower ammonia release

Explanation: Wet litter softens and irritates the footpad, increasing the risk of footpad dermatitis and breast lesions.