I have several hens that are going on 6 months old. They are 2 weeks away from being 6 months old. A few weeks ago, I noticed the two roosters mating with several of them on different occasions. Today, they mated with half a dozen hens out of at least 20 girls several times. That means they are fertile but I am getting ZERO eggs. I have looked everywhere--they are not hidden. They are simply not laying. I assumed only fertile hens got mated with and that meant they were laying. Where are the eggs?