Karen L. Jacobsen, BS, DVM, MS Farm Animal Resources & Management (F.A.R.M.), LLC

Example: You want to feed 16 lb of silage dry matter (DM) per cow per day. You discover that the silage is 30% DM.

To calculate how much silage to feed the cows, use the following equation, where X is the unknown amount of silage As Fed. (You are saying that 16 lb is 30% of X amount.)

16 = .30 X

16/.30 = X

X= 53.33 lb silage/cow/day

Thus, you need to feed 53.33 lb silage cow/day.

The "Rule of Thumb" is: Divide the desired pounds of dry matter by the percent dry matter expressed as a decimal.