My daughter's 4-H meat birds have grossly green breast meat next to the breast bone. The problem is only in the muscle that is next the breast bone, the outer breast muscle looks healthy. We have slaughtered 23 and 5 have had this problem. The birds are Cornish crosses. The meat is soft and has a green color to it. The rest of the meat looks normal. We did have few with some respiratory problems, weezing and sneezing. They weigh 6 to 8 lbs at slaughter, 8 weeks old. They were fed Purina Chicken Start and Grow Any ideas what the problem might be? We threw away the discolored meat, is the rest of the meat safe to eat? Thanks for any help!