It is something that shows up with time, the damage that it does to the cockerel. But I can’t jeopardize my hens health. And not that the cockerels life isn’t important but….I do layer feed for all my chickens. I've read how it's better for the roos if you don't, but our girls lay year round and, I think, work harder then the boys. I haven't had any ancient roos, but several ancient hens... and the roos live as long as my average hens.