I know someone who HIGHLY recommends Pennfield. She feeds it to her horse, and she does a lot of nutrition stuff for a big feed store. She's gone to several different feed manufacturing plants, and she says that Pennfield is the best. She did say that the feeds she absolutely wouldn't go for, are Triple Crown, if its from the plant in California, they have some quality issues from what she said, and then the Nutrena feeds. Triple Crown from anywhere else is also one of the top feeds she would give, and she would also recommend Purina feeds. Keep in mind though, that I have no idea what credentials she has if any, just that she is big into nutrition, and this is what she's figured out.