The most common bypass proteins

Ask 10 ruminant nutritionists about their favorite bypass protein and you’ll get 10 different answers. Some swear by heat-treated soy, others prefer fishmeal or distillers dried grains (DDGS). The truth is, there’s no universal winner — each has strengths and limits depending on the animal, the ration, and the economics. Here’s a field-level look at six of the most widely used bypass protein sources and what they deliver.