30 lbs a day of forage seems to be the number
not sure how many days to slaughter
http://www.thebeefsite.com/articles/3154/how-much-forage-does-a-beef-cow-consume-each-day
I had a friend that raised beef critters, when I was a kid. As I recall, it was about a year from him getting the calf to him selling it. (I'm sure it's different from critter to critter....)
Anyhoo, so figure - 30 lbs * 365 days = about 5-1/2 tons of forage. Total. Grazing, grains, the works. Which still sounds a little high, but I could buy it, I suppose.
Man, I've shovelled a lot of cow flops. Copious though they are...a cow just can't PROCESS as much food as the article claims.
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