I use Triple Crown Growth for my pregnant/nursing mare and she thrives on it. She's even got dapples this year, not usual for her (she's a dark bay/seal brown). I talked to one of the distributors at length years ago and he explained to me how each formula is nutritionally balanced for that specific need (mentioned on the bag what each is for) and that it's the best stuff on the market. A bag costs me about $25 I will probably always buy it, my horses are worth it.