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Dry Matter Basis Formula:
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Dry matter basis is a method of comparing pet foods by removing the moisture content, which allows for accurate comparison of nutrient levels between different products regardless of their moisture content.
The calculator uses the dry matter basis formula:
Where:
Explanation: The equation converts the "as fed" nutrient value to what it would be if all moisture were removed, allowing direct comparison between wet and dry foods.
Details: Pet foods vary widely in moisture content (from 6% in dry kibble to 80% in canned food). Dry matter basis is essential for accurate nutritional comparison between different types of pet food.
Tips: Enter the nutrient percentage as shown on the pet food label and the moisture content (also from the label). Moisture must be less than 100% for valid calculation.
Q1: Why can't I just compare the "as fed" values?
A: "As fed" values include moisture, which varies between products. A 10% protein wet food might actually have more protein per calorie than a 30% protein dry food when moisture is accounted for.
Q2: Where do I find the moisture content?
A: Look for "moisture" or "water" in the guaranteed analysis section of the pet food label. If not listed, assume 10% for dry foods and 75% for canned foods.
Q3: Does this work for all nutrients?
A: Yes, you can convert protein, fat, fiber, or any other nutrient percentage to dry matter basis using this method.
Q4: Should I use dry matter basis for calorie comparison?
A: No, calories should be compared on a "per 100 kcal" or "per kg" basis since they're already energy measurements.
Q5: How does this affect my pet's actual intake?
A: While dry matter basis helps compare foods, your pet consumes the food "as fed," so portion sizes should be adjusted based on the actual food's calorie density.