My hens are about 22 weeks old. None are laying yet. They are Light Brahmas so typically lay late. My question is that my rooster who is 2 weeks older has just started to mate with them. They are very submissive, just lay there still with no squawking. My Buff Orps squawk in terror when the roo mounts them. Is it okay for the hen to be mated before they can even lay eggs?