Moldy hay can cause abortions, as well as general stomach upset. I avoid feeding moldy hay to females. I chuck out the really discoloured/slimy/white mouldy stuff, and the better stuff around the mould patch I feed to the steers and wethers. Moldy grain goes to the pigs. They love it, and seem to do better on the mouldy stuff than the good stuff :roll: go figure.