There are literally thousands of papers on this subject: do you have access to a literature database? Even Google scholar (as suggested by the answerer above) will give you a start. The part of your question I don't understand is the "ruminant" part; you want to use fungi in conjunction with digestion by animals? If you explained that part to us, you might be able to narrow your search.
Thank @Nina Shish off. The ruminant part has to do with feed digestibility of ruminant diet which is mostly foraged based. Digesting highly fibrous feed material like straw, crop by-producuct is also important for farmer who cannot afford high concentrate diet.