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Purina Feed Calculation:
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The Purina Horse Feed Calculation determines the appropriate daily feed amount for horses based on their maintenance energy requirements (MER), the energy density of the feed, and adjustment factors for activity level, life stage, and other special needs.
The calculator uses the Purina feed equation:
Where:
Explanation: The equation calculates how many pounds of feed are needed to meet the horse's daily energy requirements, adjusted for specific needs.
Details: Accurate feed calculation is crucial for maintaining optimal horse health, preventing obesity or undernourishment, and ensuring proper nutrient intake.
Tips: Enter MER in kcal/day (typically 15,000-30,000 kcal/day for adult horses), feed energy density in kcal/lb (check feed bag label), and appropriate adjustment factor (1.0 for maintenance, higher for performance horses, pregnant mares, etc.).
Q1: How do I determine my horse's MER?
A: MER depends on body weight, with typical values ranging from 15-20 kcal per pound of body weight. A 1,000 lb horse at maintenance needs about 15,000-20,000 kcal/day.
Q2: Where do I find the feed's energy density?
A: Check the feed bag label or manufacturer's specifications. Common values range from 1,200-1,600 kcal/lb for most complete feeds.
Q3: What adjustment factors should I use?
A: 1.0 for maintenance, 1.1-1.2 for light work, 1.3-1.5 for moderate work, 1.6-2.0 for intense work. Consult your vet for special cases.
Q4: Should I adjust for hay or pasture?
A: Yes, if your horse gets significant calories from forage, reduce the calculated feed amount accordingly.
Q5: How often should I recalculate?
A: Recalculate whenever your horse's weight, activity level, or feed type changes, or at least seasonally.