Purina makes Dumor, but it is a little more powdery, and it costs around a dollar less for 50 lb., but also comes in 25 lb. which might appeal to someone with fewr chickens. I like using medicated at least for 6 weeks to help them build up an immunity to coccidiosis, but some people won't ever use it no matter what. If you read those little labels on the back of the bags, they mostly have the same ingredients. If the food is powdery you can add some water to make it wet, and the chickens will eat it. After trying nearly every brand out there I found that Purina Start and Grow, Flock Raiser, and Layena all are less powdery and worth the extra dollar.