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[RC] Blood Test Levels - PattiAnd just so you can do the math when selecting a supplement - ppm = mg per kg, divide by 2.2 to get mg per pound (then by 16 to get mg per ounce for a supplement) Selenium 0.6 ppm = 0.272 mg selenium per pound of feed Supplements will "look like" they have higher levels - but you are feeding less. Selenium 35 ppm = 15.9 mg per pound, or 0.99 mg per ounce of supplement. (35 / 2.2) / 16 = 0.99 (This works for any other trace minerals shown in "ppm"). Patti K Vail AZ
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