I recently introduced 4 20-week-old chickens to my existing flock of 5 hens. One of those 4 chickens is a rooster. Here are some positives: 1. Chickens have learned to go into coop at nighttime. 2. There was some pecking at the 4 younger chickens but never to the degree that blood was drawn or injury occurred. Now the negatives: 1. I don't think the 4 new chickens have integrated into the existing flock. They are almost like a second flock coexisting with my original flock of 5. 2. The 4 younger chickens have lost weight. In fact, they don't feel healthy when I pick them up - lots of bones, not much meat. 3. My one rooster (part of the younger flock of 4) has stopped crowing. When he was in the brooder box in my garage he consistently crowed in the early morning. Maybe I'm just not hearing him b/c the coop is a little ways back from my house, but I don't hear him crowing at all when I'm outside during the day. 4. My one rooster is not really acting rooster-like - he runs away from my older girls. Isn't he supposed to be keeping the girls in line, calling the shots, or am I mistaken?? 5. I don't think the rooster is mating with the hens...is he too young?? Will he ever assert himself with the older hens?? Will I ever get fertilized eggs? I know, lots of issues. It's just that things didn't turn out quite like I expected. Have I done something wrong?? Any feedback would be greatly appreciated.