Coronavirus vaccines for pigs and chickens are far less effective than for other animals; almost worthless, cost effective-wise. The Wuhan virus is proving to be similar, although the cost effectiveness calculation is much different (except to Fauci and Gates).
I never thought about vaccinating pigs or chickens.
I raised very healthy pork, naturally, for years. But they were on the ground and just for family consumption.
Biggest threat to chickens were the predators. Again, not a commercial operation but farmyard chickens.