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, calculated by multiplying RER by an appropriate factor.

2. How Does the Calculator Work?

The calculator uses these equations:

Where:

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

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

3. Importance of Nutrition Calculation

Details: Accurate calorie calculation is crucial for maintaining healthy weight, supporting growth in young animals, and managing weight loss programs.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between RER and MER?
A: RER is baseline calories needed at complete rest, while MER includes calories needed for normal activity and maintenance.

Q2: How do I choose the right factor?
A: Use 1.2 for neutered adults, 1.4 for intact adults, 1.6 for active/working animals, 2.0 for weight loss, and 3.0 for growing puppies/kittens.

Q3: How often should I recalculate?
A: Recalculate whenever the animal's weight changes by 10% or more, or if their activity level/life stage changes significantly.

Q4: Are there limitations to these equations?
A: These are estimates. Individual needs may vary based on metabolism, health status, and environment. Monitor body condition and adjust as needed.

Q5: Can I use this for all pets?
A: These equations work well for dogs and cats. Other species may require different calculations.