My first chickens started laying a month ago. I have ten standard sized and three silkies. One of my silkies turned out to be a rooster and I am wondering if he is actually mating with my standard sized hens (barred rocks). He's much smaller and I've never seen him mate with them. In fact the hens pick on him! I'm wondering if someone can tell me if these eggs are fertilized just by looking at the yolks.