They don't crow every time they want to mate. They crow when they want to mate and don't have any females around, like when I raise meat birds and have 30 roosters together. I usually have 6-8 roosters and 30+ hens. Some days I don't hear a single crow, but my eggs still hatch just fine. Also fertility will last up to a week in these birds, he only needs to breed her once ever 5-6 days for the eggs to be good to hatch.