I went to a Show this weekend and they had a little half hour discussion from two of the top breeders in the area on feeding and fertility. I learned that Purina Layena and a couple of other prominent feeds removed the animal proteins from the feed within the past year. I was informed that animal proteins are needed for good fertility in your flock!!! I have had a rooster with fertility problems for the first time this year and will be changing feeds. I also have a friend that has some nice birds that I hatch for also and she is having fertility issues and we both started using Layena as the only source of feed last fall. So, if you start to notice some problems hatching chicks this could be your problem. Please check your ingredient list to make sure you are feeding your animals what they need. If you only have chickens for laying eggs and pets, then you are fine feeding your gals feed without the animal proteins.