Which of the following is primarily used in veterinary science and animal nutrition?

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Question restatement: Which of the following is primarily used in veterinary science and animal nutrition?

Option 1: Metabolic body weight
Explanation: Metabolic body weight (often expressed as body weight raised to the 0.75 power, or kg^0.75) is a scaling concept frequently used in veterinary medicine and animal nutrition to estimate metabolic rate and energy requirements across different species and sizes. It underpins dosing, feed formulation, and comparing energy needs in a way that accounts for size differences beyond simple body weight.

Option 2: Basal metabolic rate
Explanation: Basal metabolic rate (BMR) is a fundamental physiological measure of the minimal energy expenditure at rest in a thermoneutral environment for a fasting, non-reproducing animal. While BMR is widely used in physiology and human nutrition, in veterinary contexts, BMR is less commonly applied directly for day-to-day feed planning across diverse species; energy estimates are more typically derived from allometric or metabolizable energy calculations that incorporate metabolic scaling concepts like metabolic body weight.

Option 3: Resting energy expenditure
Explanation: Resting energy expenditure (REE) is the energy expended by an animal at rest. In principle, it aligns with practical energy needs but in veterinary nutrition, general planning relies on species-, age-, and production-stage adjustments using standardized energy requirements rather than REE alone. REE is more often discussed in research contexts or individual animal assessments rather than as a primary tool for broad veterinary nutrition formulation.

Option 4: Body Mass Index
Explanation: Body Mass Index (BMI) is a human-centric metric used to assess weight status relative to height. It is not a standard or practical metric used in veterinary nutrition or clinical animal health, where body condition scoring, weight, and energy needs are considered instead. Therefore, BMI is not primarily used in veterinary science.

In summary, the concept that best aligns with veterinary science and animal nutrition for estimating energy needs across animals of varying sizes is metabolic body weight, due to its species-wide applicability and its role in scaling metabolic requirements.

ANSC20002_2025_SM2 Metabolic bodyweight and energy balance

Which of the following is primarily used in veterinary science and animal nutrition?

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