There are rescue charities here that solely rescue commercial hens from slaughter....battery and barn hens are slaughtered before moult at 18months. The charity go in, pay the farmer a nominal fee for release and usually have waiting lists for rehoming
my profile picture on here is one of my hens with a before and after shot....before is 2 weeks ago- her comb, wattles and face are pale, the after shot is just yesterday

amazing the difference being allowed to behave like a proper hen does to them x