First time raising Cornish Cross, got 4 chick that about 4 to 5 weeks old and they look terrible, as in ugly. Missing a lot of feathers on the back, tail, and belly. Some more than others. They seems fine , very plump, moving around the best they can , eating and drinking well. Is this normal ? I have read that the X chicken tend to look "ratty" Is this what they are referring to ? -Thanks