It depends on the confinement, the overcrowding of industrial production may be unadaptable. There are still enough instincts programmed that unfamiliar males would rather avoid each other.
I do not beleive that industrial breeding is selecting for anything that makes such prison life tolerable. Birds in production generally aren't reproducing, so nothing in the henhouse is affecting evolution.
I do not beleive that industrial breeding is selecting for anything that makes such prison life tolerable. Birds in production generally aren't reproducing, so nothing in the henhouse is affecting evolution.