This might also be helpful. Alex, @MyPetChickens, clarified this for us a couple of years ago. The post is about halfway down on the thread.
https://www.backyardchickens.com/threads/my-pet-chicken-hatchery.1148343/#post-17943054
https://www.backyardchickens.com/threads/my-pet-chicken-hatchery.1148343/#post-17943054