Why would hindgut fermenters such as a rabbit, eat their feces for nutrients?
The hindguy is posterior to the acid stomach and small intestines. Unlike foregut fermenters who can synthesize vitamin B, essential aa, and recycle nitrogen - hind gut fermintators lack such ablility. The nutrients are not passed through the small intestines and tends to be expelled in the poop. For an animal to gain essentail amino acids, the cellulose proteins must be digested; yet when microbials are located in the cecum, microes are eliminated undigested.