Does anyone have any idea what could be mixed with my barred rock chicken. I believe it is a rooster. He is 15 weeks old. He is twice as big as the other chics I bought at the same time and also those I bought 3 weeks earlier. There is a metalic gold feathering around his neck, on his back and wings. It's kind of hard to see in the pictures, but it is in the areas that look lighter and shiny. The other barred rock bought at the same time looks normal. What do you think. Also, he doesn't crow yet and is very gentle. Thanks.