I've tried Mazuri in the past before and wasn't entirely pleased with the results I experienced in the 9 month trial. The prices are also a bit more expensive because I have to have it shipped in. Right now I am trying horse chunks designed for older horses. The ingredients are ideal and it runs $12 CDN for a 50lb bag. Only downfall is the low fat. I am going to look in to the extruded feeds next time I am there to see what their levels are at. Horse feeds are truly incredible in how much they can vary... anywhere from 2-30 percent fat. The only problem is finding something with the correct levels that will also fit in a hopper