1. What is RER and MER?

RER (Resting Energy Requirement) is the number of calories needed for basic bodily functions at rest. MER (Maintenance Energy Requirement) is the total daily calories needed including activity, using an appropriate factor.

2. How Does the Calculator Work?

The calculator uses the following equations:

Where:

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

Explanation: The equation accounts for metabolic scaling where smaller animals have higher metabolic rates per unit body weight.

3. Importance of Calorie Calculation

Details: Accurate calorie estimation is crucial for maintaining healthy weight, supporting growth, pregnancy/lactation, and working animals.

4. Using the Calculator

Tips: Enter weight in kg and select appropriate activity factor. Weigh your pet regularly for most accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why use 0.75 exponent for weight?
A: Metabolic rate scales with body surface area, not directly with weight. The 0.75 exponent accounts for this relationship.

Q2: What if my pet is overweight?
A: Calculate MER based on ideal weight, not current weight, then adjust as weight loss occurs.

Q3: How accurate are these estimates?
A: They provide a good starting point but individual needs may vary by ±20%. Monitor weight and adjust as needed.

Q4: What about very small or large animals?
A: The equation works well for most dogs and cats. For animals under 2kg or over 90kg, consult a veterinary nutritionist.

Q5: Should I feed exactly the MER amount?
A: MER is an estimate. Start with 90% of MER and adjust based on body condition score changes over 2-4 weeks.