1. What is the Purina MER Equation?

The Purina MER (Maintenance Energy Requirement) equation estimates the daily calorie needs for cats based on their weight and life stage/condition. It's widely used by veterinarians and pet nutritionists to determine appropriate feeding amounts.

2. How Does the Calculator Work?

The calculator uses the Purina MER equation:

Where:

• \( weight\_kg \) — Cat's body weight in kilograms
• \( purina\_factor \) — Adjustment factor based on life stage/condition:
  • 1.2 — Adult maintenance
  • 1.4 — Weight loss
  • 1.6 — Weight gain
  • 2.0 — Kittens

Explanation: The equation accounts for the non-linear relationship between body weight and metabolic rate in cats.

3. Importance of MER Calculation

Details: Accurate MER estimation is crucial for maintaining optimal body condition, preventing obesity, and supporting growth in kittens or recovery in ill cats.

4. Using the Calculator

Tips: Weigh your cat accurately in kilograms. Select the appropriate Purina factor based on your cat's life stage and condition. For overweight cats, use current weight with weight loss factor.

5. Frequently Asked Questions (FAQ)

Q1: How often should I recalculate my cat's MER?
A: Recalculate whenever your cat's weight changes by 10% or more, or if their life stage/condition changes.

Q2: What if my cat is very active or sedentary?
A: You may need to adjust the factor slightly (e.g., 1.3 for active adults or 1.1 for very sedentary cats).

Q3: Can I use this for pregnant or nursing cats?
A: No, pregnant/nursing cats have much higher requirements. Consult your veterinarian for these cases.

Q4: How accurate is this calculation?
A: It provides a good starting point, but individual cats may vary by ±20%. Monitor body condition and adjust as needed.

Q5: Should I feed exactly the MER amount?
A: MER is an estimate. Start with 90% of MER and adjust based on your cat's body condition and activity level.