Great question. Less than 5 percent of the whole beans should pass through in the manure. Cracking soybeans into four to eight pieces will increase digestibility. The coarser the better, as fine processing reduces undegrabability. If we see whole or half beans in the manure, no feed value has been derived. Roasting makes the bean hard and less soluble for digestion.
Mike Hutjens, Extension Dairy Specialist, University of Illinois - Illini DairyNET
