Hello, I bought a bag of 22% game bird starter by mistake and didn't realize it until I had the bag open and poured it into my feed container. Is it okay to feed this to my chicks? I have standard chicken varieties such as road island reds, buff orps, slow grow broilers, black astrolorps and ameracuans. some are 5 weeks old and some are 2 weeks old. Please advise. Also, at what age to I need to provide grit?