Prediction of crude protein degradability and intestinal digestibility of rumen undegraded protein of protein supplements in cattle

Crude protein degradability and intestinal digestibility of rumen undegraded protein were predicted for Vitex fodder yeast, soybean meal, meat and bone meal and fish meal. The evaluations were performed in vitro using enzymatic methods. In order to determine crude protein degradability,,the enzymatic method with bromelain was used. To determine the intestinal digestibility of rumen undegraded protein, the combined enzymatic method with bromelain and pancreatin was applied. The results were adjusted using regression equations for cereals and protein concentrates. The crude protein degradability was 79% (adjusted by regression equation 72%) for Vitex yeast, 77% (70%) for soybean meal; 65% (59%) for meat and bone meal, and 55% (50%) for fish meal. The intestinal digestibility of rumen undegraded protein was 79% (adjusted by regression equation 87%) for Vitex yeast, 90% (98%) for soybean meal, 61% (70%) for meat and bone meal, and 85% (94%) for fish meal.