I have 14 8 week old chicks that I have had since they were a day old. They are in a coop with a 16x20 fenced, covered yard. Not sure if it matters, but in case it does, they are: 3 Barred Rocks, 3 Delawares, 4 Cuckoo Marans and 4 Black Sex Links. I brought home 5 chickens the other...