A while back there was a lot of controversy over Purina feeds. Chickens fed with this slowed down their laying. It also happened with Dumor feeds. I read that there was going to be a study on the feeds with a comparison to other feeds. Does anyone know about this? I have not ever seen anything on it. I know at that time I was using Dumor. I swapped to Kalmbach and I have never looked back. My chickens went to laying more. The Kalmbach feeds cost less than the Dumor where I was buying it so another benefit. Anyone?