I use a good Timothy/Alfalfa mix. I've never had a problem giving alfalfa hay as long as the goats are not overfed. They love the stuff and will gorge themselves. That may be why some people have a problem with bloat. It is very rich and if you switch to alfalfa you must do so gradually. I give alfalfa to my goats after they kid. You must also remember to supply a free-choice mineral block. When I dry my goats off I use a lesser quality hay or orchard grass. The quality of the hay will effect your milk yield. Some people use alfalfa pellets or alfalfa blocks, but I've never tried them.