I was reading the brochure on the care of DeKalb layers (chickens) and it was saying the protein is NOT as important for weight gain as fat % is. And it gave the appropriate %s for protein, fat, etc during each stage of a chicken's life. Adding vegetable fat in the form of oil, or the fat powder was the biggest change in each stage for higher laying production. I'm seriously considering giving half my hens fed with the higher fat, and half what htey are already eating, and seeing if things change. Of course my study would be better had I started this as chicks, instead of pre laying.