I have one drake and 2 hens. I have hatched 2 broods from the drake and original hen, and the second hen is their offspring. He mates with both girls numerous times per day, and always has. I took 6 of their eggs to incubate (3 from each hen) and after 6 days they are obviously non-fertile. It is not the incubator, as others are developing. The male is not in molt, and has his colors and tail curl. Any ideas as to why these eggs would not be fertile? Lack of fertility was not even a consideration of any possible issues. Oh...one hen and the drake are 4, and the other hen is 3. Thanks for any ideas or suggestions!