We are asked this question - weekly... And, it's a difficult one to answer. Buffalo can of course, be raised in small pastures and fed year round... or folks can raise them and perhaps only supplement feed in the winter... or folks can raise buffalo without feeding them (even grass) at all. To do this you need to determine how many acres are needed per animal unit (1 buffalo is 1 animal unit). You can get information from your local county extention office and other agencies like the U.S. Dep.t of Ag. Other factors are if the land is dry or irrigated, etc.