It's a challenge to do that because birds are not the same as cattle; cattle are not the same as pigs; pigs are not the same as horses. It depends a lot on the species and depends a lot on the organisms. However, generally the principle is to try to keep the animal—a bird, say— from being exposed to the organism by using multiple barriers. That means making sure that everything they're being fed and the bedding and everything are clean, things like that. We know that humans can bring viruses and bacteria into barns, so it means making sure that the risk from humans is minimized. It means keeping buildings built far enough, as there are airborne kinds of viruses. Those happen.
I'm sorry. I know I'm not really answering your question, but those multiple barriers and trying to make sure that the animal is not exposed is the fundamental principle of biosecurity.