All Free Veterinary Science MCQs with Answers
Every Veterinary Science question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
758 questions · page 4 of 38
- A. Propionate
- B. Acetate
- C. Butyrate
- D. Valerate
Explanation: Propionate is absorbed from the rumen and converted in the liver into glucose.
Correct answer: Propionate- A. Provide long-chain fatty acids
- B. Supply nitrogen to rumen microbes
- C. Increase dietary calcium absorption
- D. Prevent oxidation of vitamin A
Explanation: Rumen microbes use the nitrogen from urea to form microbial protein, which later supplies amino acids to the animal.
Correct answer: Supply nitrogen to rumen microbes- A. Is digested only in the rumen
- B. Cannot be digested by the animal
- C. Escapes rumen breakdown and is digested later
- D. Is synthesized only by rumen protozoa
Explanation: Rumen undegradable protein passes through the rumen without extensive microbial degradation and is digested mainly in the abomasum and…
Correct answer: Escapes rumen breakdown and is digested later- A. Positive energy balance
- B. Reduced rumen microbial activity alone
- C. Excessive phosphorus intake
- D. Negative energy balance
Explanation: Early lactation often creates negative energy balance because milk production demands exceed feed energy intake.
Correct answer: Negative energy balance- A. Vitamin D
- B. Vitamin A
- C. Vitamin E
- D. Vitamin K
Explanation: Vitamin D promotes intestinal absorption of calcium and phosphorus and supports normal bone mineralization.
Correct answer: Vitamin D- A. Hypoglycemia during weaning
- B. Hypocalcemia around calving
- C. Hypernatremia after exercise
- D. Copper toxicity during pregnancy
Explanation: Milk fever, or parturient paresis, results mainly from a sudden fall in blood calcium around parturition when calcium secretion in milk…
Correct answer: Hypocalcemia around calving- A. Fecal and saliva losses
- B. Protein and starch losses
- C. Urinary and gaseous losses
- D. Mineral and vitamin losses
Explanation: Metabolizable energy equals digestible energy minus energy lost in urine and combustible gases such as methane.
Correct answer: Urinary and gaseous losses- A. Nitrogen multiplied by 4.25
- B. Nitrogen multiplied by 5.00
- C. Nitrogen multiplied by 8.50
- D. Nitrogen multiplied by 6.25
Explanation: Crude protein is conventionally estimated as nitrogen multiplied by 6.25 because proteins contain about 16 percent nitrogen.
Correct answer: Nitrogen multiplied by 6.25- A. Neutral detergent fiber
- B. Soluble sugar
- C. Ether extract
- D. Crude ash
Explanation: Neutral detergent fiber mainly represents structural cell wall components and is associated with rumen fill and slower passage.
Correct answer: Neutral detergent fiber- A. It is the main mineral in eggshells
- B. It is a sulfur-containing essential amino acid
- C. It directly supplies intestinal bacteria
- D. It replaces all dietary energy sources
Explanation: Methionine is an essential sulfur-containing amino acid needed for protein synthesis and other metabolic functions in poultry.
Correct answer: It is a sulfur-containing essential amino acid- A. Undigested protein multiplied by 2.25
- B. Digestible ash multiplied by 2.25
- C. Digestible ether extract multiplied by 2.25
- D. Metabolizable energy multiplied by 2.25
Explanation: TDN includes digestible crude protein, fibre, nitrogen-free extract, and ether extract.
Correct answer: Digestible ether extract multiplied by 2.25- A. Undigested plant lignin
- B. Dietary mineral salts
- C. Absorbed fatty acids
- D. Fermentable carbohydrates
Explanation: Rumen microbes use ammonia as a nitrogen source and fermentable carbohydrates as energy and carbon sources.
Correct answer: Fermentable carbohydrates- A. Small intestine
- B. Large intestine
- C. Oesophageal region
- D. Urinary bladder
Explanation: Pancreatic amylase and intestinal enzymes digest starch mainly in the small intestine, where glucose is absorbed.
Correct answer: Small intestine- A. Vitamin E
- B. Vitamin K
- C. Vitamin C
- D. Vitamin B12
Explanation: Vitamin K is required for the synthesis of important clotting factors in the liver.
Correct answer: Vitamin K- A. Vitamin A toxicity
- B. Simple indigestion from hay
- C. Rumen acidosis
- D. Chronic salt deficiency
Explanation: Rapid grain feeding increases ruminal fermentation and acid production, which can lower rumen pH and cause acidosis.
Correct answer: Rumen acidosis- A. Bile acid
- B. Uric acid
- C. Hydrochloric acid
- D. Lactic acid
Explanation: Lactic acid bacteria convert plant sugars into lactic acid, rapidly lowering silage pH and inhibiting spoilage organisms.
Correct answer: Lactic acid77. Which essential fatty acid is particularly important for normal growth and reproduction in poultry?
- A. Linoleic acid
- B. Palmitic acid
- C. Stearic acid
- D. Butyric acid
Explanation: Linoleic acid is an essential polyunsaturated fatty acid for poultry and supports growth, feather development, and reproductive…
Correct answer: Linoleic acid- A. Vitamin D3
- B. Vitamin B12
- C. Vitamin K2
- D. Folic acid
Explanation: Rumen microbes require cobalt for synthesis of vitamin B12, which supports propionate metabolism and other metabolic reactions.
Correct answer: Vitamin B12- A. Adding limestone powder
- B. Adding wheat straw
- C. Adding vegetable oil
- D. Adding common salt
Explanation: Vegetable oil contains much more energy per unit weight than carbohydrate, so it increases ration energy density.
Correct answer: Adding vegetable oil80. Which volatile fatty acid is produced in the greatest proportion during normal rumen fermentation?
- A. Valerate
- B. Propionate
- C. Butyrate
- D. Acetate
Explanation: Acetate is usually the predominant volatile fatty acid formed in the rumen, especially when forage is a major part of the diet.
Correct answer: Acetate