I have 3 hens and a rooster of one breed in a separate pen from the other chickens. He would constantly mount the 3 hens even if he had to catch them. Now, it's been a month since he started loosing interest and now refuses to mate. He started really slowing down a few weeks ago only mating one hen and now he won't do it at all! I've also noticed one of the hen's eggs are not no longer fertile. It's been pretty hot here, maybe weather conditions?