1. What Is RER?

RER (Resting Energy Requirement) is the amount of energy required by an animal at rest in a thermoneutral environment. It represents the basic metabolic needs for maintaining vital body functions.

2. How Does the Calculator Work?

The calculator uses the RER equation:

Where:

• \( RER \) — Resting Energy Requirement (kcal/day)
• \( BW \) — Body Weight in kilograms (kg)

Explanation: The equation uses the metabolic weight concept (BW^0.75) which accounts for the non-linear relationship between body size and metabolic rate across different species.

3. Importance of RER Calculation

Details: Accurate RER calculation is essential for determining appropriate nutritional requirements, formulating diets, and managing the health of companion animals and livestock.

4. Using the Calculator

Tips: Enter body weight in kilograms. The value must be valid (weight > 0). The calculator will compute the resting energy requirement in kilocalories per day.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between RER and MER?
A: RER is the energy needed at complete rest, while MER (Maintenance Energy Requirement) includes normal daily activity and is typically 1.2-1.6 times RER.

Q2: Can this equation be used for all animals?
A: This equation is primarily used for dogs and cats. Other species may require different coefficients or equations.

Q3: How accurate is the RER calculation?
A: The equation provides a good estimate for most healthy adult animals, but individual variations in metabolism should be considered.

Q4: When should RER be adjusted?
A: RER should be adjusted for factors like age, reproductive status, activity level, and health conditions (illness, surgery, etc.).

Q5: Is this suitable for weight management?
A: Yes, RER serves as the foundation for calculating appropriate calorie intake for weight loss, maintenance, or gain programs.