Our flock now contains five known roosters. 4 of them were supposed to be hens. Now we are having issues with these Roos because they are fighting with our alpha roo over the hens. We figure the only way to solve this is to cull and eat them. We've tried giving them away even with a already laying hen but no progress. About 3 or 4 weeks ago these Roos had tylan injections for a respiratory infection. Is it safe to eat the meat after that?