CMPK SLOW RELEASE BOLUS 50'S, Slow Release CMPK Bolus – Nutritional supplement for cattle, sheep, swine and horses supplies adequate calcium, magnesium, phosphorus and potassium to help prevent milk fever, grass tetany and lactation failure. Dosage: Cattle and horses - 1 bolus per 250 lbs of body weight per day; Sheep & swine - 1/2 bolus per 100 lbs of body weight per day.