All Free Veterinary Science MCQs with Answers

• A. XX
• B. ZW
• C. ZZ
• D. XY

Explanation: Birds have a ZW sex chromosome system. Males are homogametic ZZ, whereas females are ZW; the XX and XY systems are associated with mammals…

• A. Cobalt
• B. Iron
• C. Iodine
• D. Calcium

Explanation: Calcium is the principal mineral deposited in the eggshell, with carbonate supplied through the hen's metabolism.

• A. Mechanical grinding of feed particles
• B. Chemical digestion of bile salts
• C. Absorption of water from digesta
• D. Storage of newly swallowed feed

Explanation: The gizzard is a thick, muscular stomach that mechanically grinds feed, often with the help of grit.

• A. ZZ chromosome combination
• B. ZW chromosome combination
• C. XX chromosome combination
• D. XY chromosome combination

Explanation: Female chickens are heterogametic and normally possess ZW chromosomes, whereas males are ZZ.

• A. Paramyxovirus group
• B. Herpesvirus group
• C. Coronavirus group
• D. Orthomyxovirus group

Explanation: Infectious bronchitis virus is an avian coronavirus that primarily affects the respiratory tract, although some strains also affect…

• A. Enhanced production of egg albumen
• B. Increased synthesis of vitamin D
• C. Reduced digestion of dietary starch
• D. Improved release of bound phosphorus

Explanation: Phytase breaks down phytate and releases phosphorus that would otherwise be poorly available to poultry.

• A. Encephalomalacia and poor coordination
• B. Rickets and soft bones
• C. Night blindness and dry eyes
• D. Goitre and enlarged thyroids

Explanation: Vitamin E deficiency can cause encephalomalacia, producing neurological signs such as ataxia and loss of coordination.

• A. Yolk antibody titre
• B. Egg specific gravity
• C. Albumen pH alone
• D. Haugh unit value

Explanation: Egg specific gravity reflects the relative amount of shell in relation to egg contents and is therefore useful for assessing shell…

• A. Herpesviridae
• B. Coronaviridae
• C. Orthomyxoviridae
• D. Picornaviridae

Explanation: Avian influenza viruses belong to the family Orthomyxoviridae and are influenza A viruses.

• A. Meckel's diverticulum
• B. Pancreatic ducts
• C. Duodenal villi
• D. Cecal tonsils

Explanation: The cecal tonsils are major lymphoid aggregates located near the junction of the small intestine and paired caeca.

• A. Remove moisture and harmful gases
• B. Increase the flock's feed intake
• C. Prevent all heat loss from birds
• D. Maintain constant artificial lighting

Explanation: Ventilation removes excess moisture, carbon dioxide, dust, and ammonia while supplying fresh air.

• A. A naturally sterile female chicken
• B. A surgically castrated male chicken
• C. A young hen before first ovulation
• D. A male chicken selected for breeding

Explanation: A capon is a male chicken that has been castrated before sexual maturity, traditionally producing a bird with distinctive carcass…

• A. Yolk index
• B. Shell thickness
• C. Haugh unit
• D. Albumen pH

Explanation: The Haugh unit combines albumen height with egg weight and provides a standard measure of albumen quality and freshness.

• A. Follicle-stimulating hormone
• B. Progesterone
• C. Prolactin
• D. Luteinizing hormone

Explanation: A preovulatory surge of luteinizing hormone causes the mature ovarian follicle to rupture and release the ovum.

• A. Blastoderm
• B. Chalaza
• C. Amnion
• D. Yolk sac

Explanation: The blastoderm is the multilayered disc of embryonic cells formed after cleavage of the fertilized ovum.

• A. Insulin
• B. Prolactin
• C. Thyroxine
• D. Glucagon

Explanation: Prolactin promotes broody behaviour and supports the physiological changes associated with incubation in hens.

• A. Muscle and bone
• B. Eggshell and feathers
• C. Faeces and urine
• D. Blood and bile

Explanation: Metabolizable energy is calculated after losses in faeces, urine, and gaseous products are deducted from feed energy.

• A. Crop
• B. Ceca
• C. Gizzard
• D. Small intestine

Explanation: Most dietary calcium is absorbed from the small intestine, where active transport is regulated by vitamin D.

• A. Progesterone
• B. Follicle-stimulating hormone
• C. Oxytocin
• D. Prolactin

Explanation: The corpus luteum mainly secretes progesterone, which maintains uterine conditions and suppresses further ovulation.

• A. Seven days
• B. Twenty-one days
• C. Fourteen days
• D. Thirty-five days

Explanation: The bovine oestrous cycle averages about 21 days, although individual variation occurs.