Probably not publicly available data, except in looking at the various flows of cattle. A common one is pasture to weaning, then pasture 'stocking operations, t

Probably not publicly available data, except in looking at the various flows of cattle. A common one is pasture to weaning, then pasture 'stocking operations, totalling one year, followed by 3 months in feedlot. I suspect you could find cattle that spend as much as 50% of their lives in confined feeding operations, but that's a guess, and obviously I couldn't say how prevalent. The 'animal rights' activists clearly insinuate that feedlots are all there is; that seems never to be the case. The actual fractions are moving targets. Even small direct-to-consumer outfits selling quarters and larger (common in Virginia) tend to finish on grain because it makes the meat more palatable.