I bought 4 6wk old hens that are now 12 weeks. one has started crowing and chasing the others, it looks like a rooster. he's beautiful and I want to keep him, but I also want to have edible eggs. Can anyone tell me what age they start being fertile, is it okay to let them have one batch of chicks (its late summer where I live), how long do they stay fertile? how do I prevent them from mating after that (can he be nutered?). I've read several books on chickens but cant find the answers!