I don't kill my hens. They gave me eggs. I don't have too many that don't lay here and there. And I don't check who is laying or not laying either. (That is work) My chickens are totally natural as far as i have had the flock for 10 years in the one place. No artificial light in the winter. The birds really slow down when the days get short. But I think that lengthens their productivity. High Protein food with oyster shell on the side. I have 4 that are broody right now. When I hatch, i eat the cockerels. I kill roosters when I get a better one, I think the old hens are important to the flock. As they get older, they generally succumb to one thing or another that causes me to have to cull them. And I do not consider them pets by a long shot. I kill everything myself .