Horse feed tag
Feed tags and hay analyses often list ingredients as “ppm” or parts per million. Does this confuse you? You aren’t alone. The best way to think of ppm is as milligrams per kilogram (mg/kg) of feed (since a mg is a one-millionth “part” of a kg). Therefore, when using mg/kg, all you have to do is make sure you’re dealing with kg of feed (instead of lbs) before doing your calculations. Consider this example: Your hay contains 0.2 ppm (mg/kg) of selenium. How many mg of selenium does 20 lbs of hay contain? First, you need to convert the lbs to kg. Since there is 0.454 kg in one lb, make the conversion by multiplying lbs by 0.454. So, 20 lbs multiplied by 0.454 equals 9.08 kg (20 x 0.454 = 9.08).
Now that you have your hay measure in kgs, you’re ready to calculate mg of selenium. Multiply 9.08 kg of hay by 0.2 ppm (or mg/kg) (9.08 x 0.2 = 1.816). That rounds to 1.8 mg of selenium in your 20 lbs of hay. Formulas to remember when working with ppm:• Convert lbs to kg: lbs x 0.454 = kg• Calculate to find mg: kg X ppm (or mg/kg) = mg
What about percentages?
The concentration of many nutrients can be presented as a percentage instead of ppm. Protein, fat, carbohydrates, and major minerals are measured as grams, rather than mg.
- Let's say you would like to know the number of grams of protein in 20 lbs of your horse's hay. It contains 8% crude protein.
- First step, convert lbs to grams: 20 lbs hay X 454 g/lb = 9080 grams.
- Next, multiply the grams of hay by the percentage (move the decimal point left two spaces): 9080 lbs of hay X .08 = 726.4 grams of protein.
- Formulas to remember when working with percentages:• Convert lbs to grams: lbs x 454 = grams• Calculate to find grams: grams X percentage (move left two decimals) = grams
Juliet M. Getty, Ph.D. is an independent equine nutritionist with a wide U.S. and international following. Her research-based approach optimizes equine health by aligning physiology and instincts with correct feeding and nutrition practices. Dr. Getty’s goal is to empower the horseperson with the confidence and knowledge to provide the best nutrition for his or her horse’s needs.
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