Hi, I have 2 roosters who are 20 wks old. They have just (in the last 2 weeks) started making lame attempts to treat the mature hens in my flock. One is starting to gain some ground and the ladies are being nicer to him. My question is, if a rooster is starting to do this does that mean he is probably mature enough to fertilize eggs? Or do they start doing this before they are actually able to fertilize eggs?