1. What is the Purina MER Equation?

The Purina MER (Maintenance Energy Requirement) equation estimates the daily caloric needs for cats based on their weight and activity level. It provides a scientifically validated method to determine appropriate food portions.

2. How Does the Calculator Work?

The calculator uses the Purina MER equation:

Where:

• \( weight\_kg \) — Cat's weight in kilograms
• \( factor \) — Activity level multiplier (1.2-2.0)

Explanation: The equation accounts for the metabolic scaling of energy requirements with body weight, using the 0.75 power law that's well-established in veterinary nutrition.

3. Importance of MER Calculation

Details: Accurate MER estimation is crucial for maintaining optimal weight, preventing obesity or malnutrition, and ensuring proper nutrition for cats at different life stages.

4. Using the Calculator

Tips: Weigh your cat accurately in kilograms. Select the appropriate activity factor based on your cat's life stage and condition. For weight management, consult your veterinarian.

5. Frequently Asked Questions (FAQ)

Q1: Why use 0.75 exponent for weight?
A: Metabolic rate scales with body weight to the 0.75 power, not linearly. This accounts for how larger animals have relatively lower metabolic rates per unit of body weight.

Q2: What are typical MER values for cats?
A: Most adult cats need 20-30 kcal per pound of body weight daily, but this varies significantly with age, activity level, and health status.

Q3: How often should I recalculate my cat's MER?
A: Recalculate whenever your cat's weight changes by 10% or more, or if their activity level significantly changes (e.g., becomes more sedentary).

Q4: Are there limitations to this equation?
A: The equation may need adjustment for very young kittens, pregnant/lactating females, or cats with certain medical conditions like hyperthyroidism.

Q5: Should this be used for sick cats?
A: Cats with illness may have different energy requirements. Always consult with a veterinarian for cats with health conditions.