It's a matter of calculating it out. It's been awhile since I did the calculation and the last time I tried it, I actually couldn't get it to pencil, but Georgia actually uses the same value (790) that I calculated many years ago when I couldn't actually find a reference. I know (remember anyway) that I calculated the 790 value using 365 days a year and divided that be 12 months, used 1,000 lbs of live animal weight (by definition, 1 Animal Unit) (most cows weigh 1,200-1,400 lbs so 1.2-1.4 AUs each) and I think I used 3% as the percentage of body weight an animal takes in in terms of forage on a daily basis. An AU (animal unit) = 1,000 lb live weight, An AUM (Animau Unit MOnth) is the quantity of forage this AU consumes in a month = 790 lbs.
