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My western washington hay is plenty good for the cows and llamas. The sheep would rather not eat it, but they can get by through the winter here even on the slow growing grass. IOf course the problem with making hay on our side of the mountains is that you can't even take your baler out of the barn until July. So, I have to mow in early spring to get the timing correct. Your cows will need 35 lbs dry matter per day through the winter.
Pigs and cows can share a pasture. If it's high quality grass which you have seeded, though, they will root up a fair ammount and kill it. So, I like to put my pigs in odd spaces where I can't get the tractor to mow, or is ditches, or too steep. They plow it up for me saving me hard work, and to them it's just playing.
Grass Fed: 90% of their diet must be grass, milk or forage. Depending on how old the animal is, you can squeeze in some grain fattening at the end if you feel you must. But, it defeats the whole point and the 90% rule may become 100% soon.
Grass Fed/Grass Finished: 90% gras, milk, forage and no grain fattening. It's what we raise and sell.