When you lump things together white,drk. brn.,brn. colored. Say the white egg layers add up the breeds and there average weights you will come up with an average weight and feed in take. Then do drk. brn. then so on and so on thats probably where they came up with that. Probably the brn eggers may have an average of heaverier weight birds, maybe even more brown eggers . So there is why they eat more. Just my guess. I just don't feel like totally doing all the math. I get what I like/want with production in mind but, I'm not going to spend my life feeding a bunch of ugly birds because they eat less. Part of this is for me and my sanity. I like to look out my windows and see my animals...its very relaxing and you have to have the will to care for them Sooo get what you like.