Have you asked your county extension agent? There are a few variables, but you need to specify round or square bales, how many cow and breed (size). The agent should be able to guide you on this.
Wow I didn't realize I would receive so many great answers! I wanted to thank you all for replying.Hello I'm in SE Georgia right on the Georgia Florida Line and I was wondering how y'all figure how many bales of hay you need per cow per month over a 3 month winter season. I know the exact number would depend on many different factors but what I'm looking for is a simple "guesstimate" of bales of hay per cow per month. Thanks for your time!