Before this thread gets any further off track, i'm not disputing the fact that a cow/goat/sheep can eat moldy hay and not suffer the same effects that a horse would. However, the OP is discussing keeping goats with horses, so cannot feed moldy hay if she keeps them both together. I drink what comes from my goats, I want their milk to be as good as possible both in terms of flavour and nutrition, so only feed them horse quality alfalfa. Not to mention it is a lot more convenient than having two different supplies of hay. Commercial dairy cows eat all kinds of crap, that doesn't mean I want it in our food supply.