Not sure as to the size of yoru Brewery, but if you are smaller (7 - 20 Bbl) it is real hard finding a place to "give" the yeast to. It must be sterilized (killed) to feed to cattle.
We ended up buying a 500 gallon tank for our 7 Bbl and pumping the spent yeast into that. A liquid waste service (same folks who do Honey Buckets) comes and pumps it out. We bought a 1,300 gallon for our larger 15 Bbl Brewery.