Yeah, alfalfa is definitely higher in protein and would probably work for cows or real dairy farms. We couldn't use it exclusively because we had no way of keeping the non-lactating or non-pregnant does and wethers out of it. It's way too rich for goats that don't have higher calorie needs and can cause trouble (and fatness!). Goats are a little different from cows and sheep anyway. They can't survive on grass alone. They are more like deer and NEED weeds, seeds, grains and other things to supplement grass.

I was thinking about this thread on my drive home last night. I would bet that cheese (and seasonal butter) could be considered 100% grass depending on what time of year the milk is harvested. I mean, the cow might not be on grass 100% all year, but the milk comes from what the cow has been eating recently. After a spring on nothing but grass, the milk would be all 'grass-produced' (yeah, that's not a real term!). It's a little different than grass fed meat where what the animal ate for its whole life matters more.