Some french chickens have a very finely textured flesh too - perhaps it's this texturing which responds better & the makes it worth doing? If it works with pigs though, why not with RIRs, NHRs, etc?
Sorry to hear about the predators & pests around you - it must be really annoying!
Some breeds like Barbezieux, coucou de rennes, and Malines were/are fed special diets for a week or two before eating. I suppose it tenderises an flavours the meat - like milk-fed pork?