1. What is RER and MER?

RER (Resting Energy Requirement) is the number of calories needed for basic physiological functions at rest. MER (Maintenance Energy Requirement) is the total daily energy requirement including activity, calculated by multiplying RER by an appropriate factor.

2. How Does the Calculator Work?

The calculator uses these equations:

Where:

• \( weight_{kg} \) — Body weight in kilograms
• \( factor \) — Activity multiplier based on life stage and condition

Explanation: The 0.75 exponent accounts for metabolic scaling across different body sizes.

3. Importance of Energy Calculations

Details: Accurate energy requirement calculations are essential for proper nutritional management, weight control, and health maintenance in veterinary patients.

4. Using the Calculator

Tips: Enter accurate body weight in kilograms and select the appropriate activity factor based on the animal's life stage and condition.

5. Frequently Asked Questions (FAQ)

Q1: Why use 0.75 exponent for weight?
A: This accounts for metabolic scaling - larger animals have relatively lower metabolic rates per kg of body weight.

Q2: What are typical factor values?
A: Factors range from 1.2 (sedentary neutered adult) to 3.0 (growing puppy/kitten).

Q3: How accurate are these estimates?
A: They provide good starting points but individual animals may vary by ±20%.

Q4: When should I use MER vs RER?
A: Use RER for hospitalized patients, MER for healthy pets at home.

Q5: How often should I recalculate?
A: Recalculate with significant weight changes (>10%) or life stage changes.