A few days ago, my breeding Black Copper Maran rooster started wheezing and sneezing. He had discharge coming from the nostrils and gurgled a lot. I called a professor at UC Davis, CA and he said "Go to you feed store and get a bottle of Tylan 50 and a 3CC syringe needle. Inject 1/2 cc into breast one time daily for 3 days." This stuff works like magic, after the first morning my roo was up and chasing the hens already, still a little droopy but way better.