Cattle on antibiotics must be held from slaughter a certain number of days depending on the antibiotic so it will clear the system. Don't eat kidneys or brains.
Cattle are not given antibiotics to help them consume grain. Antibiotics can be in the feed of just started animals, steers and heifers that are 5-6 months old. They are usually bought from commercial breeders and moved to the feedlot which is the human equivalent of kids being exposed to all kinds of things at school.They do not make it to your table until they are 20-24 months old.. That article is from 2007 things change fast in the food industry. We are not a feedlot operation