Hindgut fermenters use microbes (bacteria only) and fermentaion in their hindgut, the caecum and proximal colon.
Microbes that are washed out cannot be digested and therefore high-quality protein is lost.
Examples of hindgut fermenters are horses, koalas, possums, wombats and pigs. (not pigs, because only herbivores have hindgut or foregut)
Foregut Fermeters have two sacs (a tubiform and a sacciform fore stomach) containing lots of microbes. These microbes consume glucose from cellulose but produce fatty acids that the animal can use for energy.
(Microbes can also be digested further along the digestive tract as they are also a source of protein)
Forgut Fermentation is a slower digestive process.
Examples of foregut fermenters are sheep, cattle, hippopotamus, wallabies and pademelons. (generally larger animals)
Read more: http://wiki.answers.com/Q/What_is_the_differences_between_hindgut_and_foregut_fermenters#ixzz251pG6L9i