Are we feeding our dairy heifers too much protein?

摘要

Ruminant animals, such as dairy cows, are very good at extracting energy from things we cannot eat, such as grass, and converting it into things we can eat or drink, like milkHowever, they are not particularly efficient at using feed protein. On average, European cows use about 28% of the protein they are fed to make milk protein, meaning the other 72% is excreted.