The extra size I'm talking about is maybe 8 ounces. That's just something I'm experimenting with. My main flock is pure game.
As for what my birds eat in the winter, not be smart alicky, but I really don't know. I just see them constantly foraging. Game chickens have built in survival skills, that have been breed out of domestic chickens. They eat things that domestic chickens won't eat. When there's snow on the ground, both domestic and game will be scratching through the snow. But the domestic chickens won't have much in their craws, while the game chickens craws are fairly full. So, I have to supplement the domestic chickens. Heck, I have to supplement the domestic chickens right now. I call them my worthless chickens. God created chickens to be self sufficient. Man has decided that he can improve on what The Lord did. So, he's breed the self sustainability out of chickens, and turned them into domestic, worthless, dependant chickens.