I've had had more success with weight gain and fat cover with Producers. But I don't feed just straight feed either, my goal is always to keep the rumen healthy. I'm not sure where you are but they are in Bryan, TX. I've used Lissey and Eckel and also Excel. Honestly, they all look like they have the same ingredients anyway and range from $ 9.50 to $ 12.50 a bag depending on where you buy it. Purina was just more expensive so I've never used it..