Very interesting article. Thanks for the post.
Two items jump out at me. One is:
" A 1,500-pound cow needs 50 per cent more forage per day than a 1,000-pound cow"
which implies a 1500 lb cow needs 25% more than a more realistic (imho) 1200 lb cow, Or a 1900 lb cow needs approximately 58% more than a 1200 lb cow, both lactating and producing essentially identical 205 day calves.
The other is the typical academic discussion of how many "tons of forage" are in an acre.
Personally I am not real good at understanding or estimating tons per acre when I look at some grass in a pasture.
I can tell the difference between 10" tall grass and 4" tall grass. And I am starting to be able to correlate the grass I see with the number of days a number of cows can be on it and take 10" grass down to 4". I think cow-days is a much more understandable and calculateable/useful measure of grass than tons.
But useful info. Thanks. Jim