Free Animal Nutrition and Feeding MCQs with Answers
59 Animal Nutrition and Feeding MCQs from Veterinary Science, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Covers carbohydrates, proteins, lipids, minerals, vitamins and water, along with digestion, absorption and energy metabolism in domestic animals. Questions involve feed evaluation, nutrient requirements, ration formulation, forage and concentrate feeds, deficiency disorders, and the differences between ruminant and monogastric nutrition.
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59 questions · page 3 of 3
- 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.
Correct answer: Gross energy intake- 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.
Correct answer: Nitrogen intake exceeds nitrogen loss- 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.
Correct answer: 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.
Correct answer: Supply rumen buffering capacity- 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.
Correct answer: Live beneficial microorganisms46. Which domestic animal commonly requires dietary vitamin C because it cannot synthesize enough of it?
- 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.
Correct answer: Guinea pig- 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…
Correct answer: 2.25 times as much energy- 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…
Correct answer: It removes the diluting effect of water- 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.
Correct answer: Rapid drying before storage- 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.
Correct answer: Feces only- 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.
Correct answer: Lower protein and higher fibre- 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.
Correct answer: Reduce particle size and stimulate saliva secretion- 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.
Correct answer: Cannot synthesize in adequate amounts- 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.
Correct answer: Amino acid requirements55. In a feedlot ration, excessive dietary fat can reduce animal performance primarily because it may:
- 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.
Correct answer: Depress fibre-digesting microorganisms- 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.
Correct answer: Amino acid balance and digestibility- 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.
Correct answer: More lignified cell-wall 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.
Correct answer: Match nutrient supply with changing requirements- 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.
Correct answer: Water dilutes the nutrients per unit weight