My sister is raising chickens for the first time. She thought she was buying all female chicks, but as they have grown, one definitely appears to be a rooster. She thinks this is okay. But he seems to be getting super fat. She says he just hangs out by the food and chows down while all the others are roaming around. He can barely walk! 1. Will having a rooster around be an issue? For example, won't he try to mate with all the hens? 2. Is his weight a concern? Is there any way to cut back his food? He is with the whole flock, so he has access as long as all the others do.