Question: how to calculate tdn in cattle feed?
Answer: Divide the “as fed” percentage of a particular nutrient by the dry matter percentage calculated in Page 2 step 1. In this example for TDN, 50.79% / 86.8% = 58.51%. For CP, 7.2% / 86.8% = 8.3%. Multiply by 100 to convert the resulting decimal to a percentage.