All Free Veterinary Science MCQs with Answers

• A. Gross energy intake
• B. Urinary energy loss
• C. Methane energy loss
• D. Milk energy output

Explanation: Digestible energy equals gross energy consumed minus the energy lost in feces.

• A. Nitrogen loss exceeds nitrogen intake
• B. Nitrogen intake exceeds nitrogen loss
• C. Nitrogen intake equals nitrogen loss
• D. Urinary nitrogen is completely absent

Explanation: Positive nitrogen balance means that more nitrogen is retained than lost, allowing tissue growth, pregnancy, or production.

• A. 3.0 to 4.0
• B. 4.5 to 5.5
• C. 6.0 to 7.0
• D. 8.0 to 9.0

Explanation: Cellulolytic rumen microbes function best in a mildly acidic to near neutral environment, usually around pH 6.0 to 7.0.

• A. Replace essential amino acids
• B. Increase dietary protein content
• C. Destroy feed moulds
• D. Supply rumen buffering capacity

Explanation: Sodium bicarbonate helps neutralize acids in the rumen and supports a more stable pH.

• A. Live beneficial microorganisms
• B. Digestive enzymes only
• C. Synthetic growth hormones
• D. Inorganic mineral salts

Explanation: Probiotics are live microorganisms supplied in adequate amounts to benefit the host, often by supporting intestinal microbial balance.

• A. Cattle
• B. Guinea pig
• C. Goat
• D. Sheep

Explanation: Guinea pigs cannot synthesize vitamin C because they lack functional gulonolactone oxidase, so dietary supplementation is necessary.

• A. The same amount of energy
• B. Twice as much energy
• C. 2.25 times as much energy
• D. Four times as much energy

Explanation: Fat provides about 9 kilocalories per gram, whereas carbohydrate provides about 4 kilocalories per gram, giving fat roughly 2.25 times the…

• A. It prevents all nutrient losses
• B. It increases the feed protein content
• C. It measures only mineral nutrients
• D. It removes the diluting effect of water

Explanation: Dry matter comparison removes differences caused by variable moisture content and allows the actual nutrient concentrations of feeds to be…

• A. Rapid drying before storage
• B. Increasing particle size after storage
• C. Adding untreated water before feeding
• D. Storing forage in open sunlight

Explanation: Rapid drying lowers moisture and restricts the growth of moulds and spoilage microorganisms in hay.

• A. Urine only
• B. Feces only
• C. Expired gases only
• D. Sweat and saliva

Explanation: Apparent digestibility compares nutrient intake with the nutrient recovered in feces.

• A. Higher protein and lower fibre
• B. Higher moisture and lower lignin
• C. Lower protein and higher fibre
• D. Lower fibre and higher digestibility

Explanation: Maturing forage develops more structural cell-wall material and lignification, while its crude protein concentration generally falls.

• A. Increase particle size before swallowing
• B. Move all digesta directly into the abomasum
• C. Prevent microbial fermentation in the rumen
• D. Reduce particle size and stimulate saliva secretion

Explanation: Regurgitation and rechewing reduce feed particle size and promote mixing with saliva.

• A. Cannot synthesize in adequate amounts
• B. Uses only for energy production
• C. Stores mainly in adipose tissue
• D. Excretes unchanged in the urine

Explanation: Essential amino acids must be provided by the diet because the animal cannot produce enough of them to meet metabolic needs.

• A. Energy losses in feces
• B. Amino acid requirements
• C. Water consumption pattern
• D. Mineral excretion rate

Explanation: Ideal protein contains essential amino acids in a pattern that matches the animal's needs for maintenance and production.

• A. Increase rumen fibre digestion
• B. Convert protein directly into glucose
• C. Depress fibre-digesting microorganisms
• D. Eliminate the need for minerals

Explanation: High levels of unsaturated or total dietary fat can interfere with rumen microbes, especially fibre-digesting organisms.

• A. Crude fibre concentration alone
• B. Ash content without mineral analysis
• C. Feed colour and particle size
• D. Amino acid balance and digestibility

Explanation: Protein value depends on both the availability of its amino acids and their balance relative to the animal's requirements.

• A. More lignified cell-wall material
• B. More soluble sugars and protein
• C. Less structural carbohydrate
• D. More available essential amino acids

Explanation: Late-cut hay usually has a greater proportion of mature, lignified stems and less readily digestible leaf material.

• A. Provide the same diet at every age
• B. Match nutrient supply with changing requirements
• C. Prevent birds from consuming water
• D. Replace vaccination with nutrition

Explanation: Broilers change their requirements for energy, amino acids, minerals, and other nutrients as they grow.

• A. Water converts fibre into starch
• B. Moisture increases crude protein chemically
• C. Water dilutes the nutrients per unit weight
• D. Moisture removes all mineral matter

Explanation: As-fed weight includes both dry matter and water, so greater moisture means fewer nutrients are present in each unit of feed weight.

• A. It supplies passive immunity through immunoglobulins
• B. It prevents all digestive diseases throughout life
• C. It replaces the calf's need for milk during rearing
• D. It increases body temperature by stimulating rumination

Explanation: Colostrum contains immunoglobulins that provide passive immunity because the calf is born with limited circulating antibodies.