1. What is the MER Equation?

The MER (Maintenance Energy Requirement) equation estimates the daily calorie needs for pets based on their weight and activity level. This formula is commonly used by Purina and other pet nutrition experts to determine appropriate feeding amounts.

2. How Does the Calculator Work?

The calculator uses the MER equation:

Where:

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

Explanation: The equation accounts for the non-linear relationship between body weight and metabolic rate, with different factors for different activity levels and life stages.

3. Importance of MER Calculation

Details: Accurate MER estimation is crucial for maintaining optimal body condition, preventing obesity, and ensuring proper nutrition for pets at different life stages.

4. Using the Calculator

Tips: Enter weight in kilograms and select the appropriate activity factor based on your pet's life stage and condition. All values must be valid (weight > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why use 0.75 as the exponent for weight?
A: The 0.75 exponent reflects the metabolic scaling relationship between body size and energy requirements in animals.

Q2: What are typical MER values for different pets?
A: A 10kg neutered adult dog typically needs about 700 kcal/day, while a 5kg kitten may need 1000 kcal/day.

Q3: When should I adjust the activity factor?
A: Adjust if your pet's activity level changes significantly, or if they are pregnant, nursing, or recovering from illness.

Q4: Are there limitations to this equation?
A: Less accurate for very small or very large breeds, and for pets with significant health conditions affecting metabolism.

Q5: Should this be the only factor in determining food amounts?
A: No, also consider the pet's body condition score, food type, and manufacturer's feeding guidelines.