HI, I have a mix of Cornish and several other varieties from tractor supply. They told me to put antibiotics in there water (1 teaspoon a gallon) (terramycian /oxymycilliam) for the first week. We have added additional birds to the group several times, so the oldest birds have all had antibiotics for close to 3 weeks now, and the youngest birds are over a week now. I tried now mixing in any antibiotics yesterday, and within 8 hours there was sneezing and loose stools. I added the antibiotics back in and the sneezing is virtually gone and stools seem back to normal. Any ideas how I should proceed? These are my meat birds and I want to have them off antibiotics as long as I can before processing. Thanks Jamie Neenah, WI p.s. They are inside. I keep the bedding dry, I stir up the bedding / add new bedding / remove damp bedding / add DE, once to twice twice a day. The birds act fine and look to be in excellent health.