I seem to be having bad luck with my chickens & need some suggestions. I got 7 from Tractor Supply 1 month ago. One didn't make it through the 1st night. The other 6 were happy and healthy, until an outdoor critter got 3 of them. Problem solved, they are safe in the coop, now. We got 3 new babies 1 week ago, and 1 died that night, the 2nd the next day. Respiratoy problems. I began giving all of them Duramycin-10. The 3rd is a strong girl! She has done well. I have been keeping the baby in the kitchen brooder, but the 3 outside have been around her a little. Now, one of the bigger ones outside is sneezing and wheezing. That one is approximately 5 or 6 weeks old. I'm still giving them Duramycin-10, though I did skip yesterday. I think I made a mistake. Any suggestions? No more loss. It's breaking my heart.