I have just started with Chickens a few month ago. I have two cocks and six female chicken. After about one month one Hen started incubating her eggs and hatched 9 out of 10 eggs. A few weeks later four other hens started to Incubate. I candled the eggs and only two of ten eggs where showing development. What could be the cause of this low fertility in so many hens? Could it be that I fed them something that is not good for them? Or could it be that the Cock is the Problem? I noticed that there is a big spot at the underside where there is no feathers. New feathers are developing but very slow, and the skin in that area is read. Waiting to hear what others have experienced.