All Free Veterinary Science MCQs with Answers

• A. It increases calcium permeability
• B. It blocks folate synthesis
• C. It inhibits beta-tubulin assembly
• D. It paralyses nematode muscle by opening chloride channels

Explanation: Praziquantel increases calcium permeability in the tegument and muscle of cestodes, causing contraction, paralysis, and damage to the…

• A. Vitamin A
• B. Vitamin E and selenium
• C. Vitamin D
• D. Vitamin K and cobalt

Explanation: White muscle disease results mainly from inadequate vitamin E and selenium, which are important antioxidants for skeletal and cardiac…

• A. Low reticulocyte count
• B. Marked neutropenia
• C. Increased reticulocyte count
• D. Reduced plasma fibrinogen

Explanation: An increased reticulocyte count indicates that the bone marrow is releasing immature red cells in response to red-cell loss.

• A. Marek disease
• B. Fowl pox
• C. Infectious bursal disease
• D. Newcastle disease

Explanation: Newcastle disease is caused by avian orthoavulavirus 1, historically called avian paramyxovirus type 1.

• A. Milk somatic cell count
• B. Milk lactose concentration
• C. Milk urea concentration
• D. Milk freezing point

Explanation: Mammary inflammation commonly increases the milk somatic cell count, even when visible changes in milk or the udder are absent.

• A. Immunoglobulin A
• B. Immunoglobulin G
• C. Immunoglobulin E
• D. Immunoglobulin M

Explanation: Immunoglobulin G is the main antibody absorbed from bovine colostrum and provides systemic passive immunity to the calf.

• A. Free-gas bloat
• B. Traumatic reticulitis
• C. Frothy bloat
• D. Right-sided volvulus

Explanation: Legumes such as alfalfa and clover can produce stable foam that prevents normal eructation, causing frothy bloat.

• A. Normal urea with reduced filtration
• B. Increased urea with severe dehydration
• C. Increased urea with renal failure
• D. Increased urea with urinary obstruction

Explanation: Postrenal azotaemia occurs when urine outflow is obstructed or urine leaks into body tissues, causing urea and creatinine to accumulate.

• A. An equine lentivirus
• B. An equine adenovirus
• C. An equine coronavirus
• D. An equine herpesvirus

Explanation: Equine infectious anaemia is caused by equine infectious anaemia virus, a lentivirus in the Retroviridae family.

• A. Diffuse pulmonary oedema
• B. Haemorrhagic typhlocolitis
• C. Fibrinous pericarditis
• D. Necrotic hepatitis

Explanation: Bovine coccidiosis commonly damages the intestinal mucosa, particularly the caecum and colon, producing diarrhoea that may contain blood.

• A. To prevent immediate drug allergy
• B. To increase the animal's antibody titre
• C. To remove drug residues from food
• D. To restore normal rumen contractions

Explanation: The withdrawal period allows residues of the drug and its metabolites to fall below permitted limits in meat, milk, or eggs.

• A. Schirmer tear test
• B. Serum protein electrophoresis
• C. Direct antiglobulin test
• D. Fecal egg count reduction test

Explanation: The fecal egg count reduction test compares parasite egg counts before and after treatment and helps identify anthelmintic resistance.

• A. Hyperkalaemia
• B. Hypochloraemia
• C. Hypercalcaemia
• D. Hypophosphataemia

Explanation: Urethral obstruction reduces potassium excretion and can produce life-threatening hyperkalaemia, especially when renal function is…

• A. Oestrogen
• B. Progesterone
• C. Prolactin
• D. Oxytocin

Explanation: Progesterone from the corpora lutea maintains the uterine environment and suppresses excessive myometrial contractions during canine…

• A. Mild pain relieved by feeding
• B. Normal heart rate with soft faeces
• C. Persistent severe pain with cardiovascular compromise
• D. Gradual weight loss without abdominal pain

Explanation: Strangulating obstruction causes severe, persistent pain and rapidly worsens cardiovascular status because intestinal blood supply is…

• A. Marked swelling of the distal limbs
• B. Progressive enlargement of the thyroid gland
• C. Severe unilateral pupil dilation
• D. Persistent muscle tremors or rhythmic myoclonus

Explanation: Canine distemper may cause rhythmic muscle jerks, especially in the limbs or facial muscles, because of central nervous system…

• A. Picornaviridae
• B. Herpesviridae
• C. Retroviridae
• D. Adenoviridae

Explanation: Foot and mouth disease virus belongs to the family Picornaviridae and affects cloven hoofed animals.

• A. Budding yeast cells inside neutrophils
• B. Paired pear shaped organisms inside red cells
• C. Large acid fast rods between red cells
• D. Motile larvae within platelet clumps

Explanation: Babesia organisms are intraerythrocytic parasites and may appear as paired pear shaped bodies in red blood cells.

• A. Listeria monocytogenes
• B. Corynebacterium pseudotuberculosis
• C. Clostridium perfringens type D
• D. Mycobacterium bovis

Explanation: Clostridium perfringens type D causes enterotoxaemia, often called pulpy kidney disease, in rapidly growing sheep receiving rich diets.

• A. Vitamin B12 deficiency
• B. Vitamin C deficiency
• C. Vitamin K deficiency
• D. Vitamin A deficiency

Explanation: Vitamin A deficiency can cause poor growth, rough coat, impaired epithelial health, and night blindness.