I have a sick cow that I think will like but has something wrong with her legs. I am having to feed her feed and water by hand in a covered area everyday. my vet came and gave her all the necessary medicine to try to get her back up. my question is there is a 14-21 withdraw slaughter time for antiboitcs. why. I know that people are allergic to penacillin. but if I was going to have this slaughtered for myself and I am not allergic, why would this hurt anything. also if the amount of medicine given is absorbed into a 1000 lb animal will the medicine in the meat not be dilluted. will cooking the meat not kill the medicine. also do you really believe people don;t haul cattle everyday to get slaughtered that have this medicine in them. thanks