All Free Veterinary Science MCQs with Answers

• A. 0.5
• B. 1.0
• C. 2.0
• D. 4.0

Explanation: Feed conversion ratio is calculated by dividing feed consumed by body weight gain.

• A. A birnavirus
• B. A retrovirus
• C. A poxvirus
• D. A herpesvirus

Explanation: Marek's disease is caused by an oncogenic herpesvirus of chickens, commonly called Marek's disease virus.

• A. 18 days
• B. 21 days
• C. 24 days
• D. 28 days

Explanation: A chicken egg normally hatches after about 21 days of incubation at the proper temperature and humidity.

• A. Grinding feed mechanically
• B. Storing and moistening feed
• C. Producing digestive enzymes
• D. Absorbing most nutrients

Explanation: The crop is an enlargement of the oesophagus that temporarily stores and moistens ingested feed.

• A. Pulmonary alveoli
• B. Air sacs
• C. Parabronchi
• D. Syrinx

Explanation: Gas exchange in birds occurs mainly through the parabronchi and their associated air capillaries.

• A. To improve bone formation
• B. To prevent respiratory infection
• C. To increase egg shell thickness
• D. To reduce feather pecking and cannibalism

Explanation: Controlled beak trimming reduces damage caused by pecking, especially feather pecking and cannibalism.

• A. Eimeria
• B. Salmonella
• C. Mycoplasma
• D. Aspergillus

Explanation: Most important poultry coccidiosis is caused by species of Eimeria, which multiply in different parts of the intestinal tract.

• A. Excessive heat
• B. Insufficient heat
• C. Adequate ventilation
• D. Excess dietary protein

Explanation: Chicks crowd under the brooder when they are cold and seeking additional warmth.

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

Explanation: The magnum is the longest oviductal region and adds most of the albumen around the yolk.

• A. Encephalomalacia
• B. Night blindness
• C. Scurvy
• D. Rickets

Explanation: Vitamin D is required for proper calcium and phosphorus metabolism, so its deficiency causes poor bone mineralization and rickets.

• A. Uterovaginal sperm storage tubules
• B. Infundibular glands
• C. Shell gland lumen
• D. Ovarian follicles

Explanation: Sperm storage tubules located mainly at the uterovaginal junction can retain viable sperm for later fertilization.

• A. High egg number and long laying life
• B. Rapid growth and efficient meat production
• C. Fine wool production and body cover
• D. Strong flight ability and migration

Explanation: Broiler breeding emphasizes rapid growth, desirable carcass yield, and efficient conversion of feed into meat.

• A. They directly exchange oxygen with blood
• B. They ventilate the lungs by moving air
• C. They filter dust from inhaled air
• D. They produce surfactant for the lungs

Explanation: Air sacs act as bellows that maintain a largely one-way flow of air through the parabronchi.

• A. Avian influenza virus
• B. Infectious bursal disease virus
• C. Infectious bronchitis virus
• D. Avian paramyxovirus type 1

Explanation: Newcastle disease is caused by virulent strains of avian paramyxovirus type 1, also called Newcastle disease virus.

• A. It stores readily mobilized calcium
• B. It produces ovarian hormones
• C. It strengthens the keel bone
• D. It absorbs calcium from the intestine

Explanation: Medullary bone serves as a temporary calcium reserve used during eggshell formation.

• A. To prevent feather pecking
• B. To stimulate reproductive activity
• C. To reduce drinking water intake
• D. To increase chick body temperature

Explanation: Light stimulates the hypothalamic-pituitary-gonadal system and helps maintain reproductive activity in mature hens.

• A. Salmonella enterica
• B. Escherichia coli
• C. Pasteurella multocida
• D. Clostridium perfringens

Explanation: Pasteurella multocida is the usual cause of fowl cholera, an acute septicemic disease of poultry.

• A. Tyrosine
• B. Glycine
• C. Alanine
• D. Methionine

Explanation: Methionine is often limiting in diets based heavily on maize and soybean meal and is therefore commonly supplemented.

• A. To observe embryo development
• B. To measure shell calcium content
• C. To determine the hen's breed
• D. To calculate the egg's protein content

Explanation: Candling uses transmitted light to reveal the air cell, blood vessels, embryo development, and some cracks.

• A. To increase the egg's calcium content
• B. To prevent the embryo from adhering to membranes
• C. To make the yolk produce more albumen
• D. To shorten the genetic generation interval

Explanation: Turning prevents the developing embryo and extra-embryonic membranes from adhering to the shell membranes and supports normal development.