Just changed my horses food to Ultium competition by Purina in prep for next years show season for my 2 year old mare. I used to feed her more of an average Omelone type grain with Essential K for added protein. I can tell that the Ultium is very high in usable nutrients and I might reduce her added EK because it looks like she's getting all she needs from the new feed. As her workload increases, I'll keep track and post an update!