One of my younger cockerels (22 weeks, a Marans) has been attacked through the fence by my older rooster. My injured bird's crop has been cut open, about a 1/2" cut. It seems to be near the top of his crop. I've isolated him in a large cage in our mudroom, but haven't done anything else. He seemed pretty stunned, so I was concerned about stressing him out more tonight. It's such a small tear, I'm not sure how or even if I should try to repair it. Flies here have gotten out of control, so I'm concerned about them. He's one of the cockerels that I was planning on using for breeding and he's such a great bird, so I want to be sure he heals well. What can I do?