My flock has been ill with a respitory illness and I have been treating them with tylan 50 injections 1cc for the big birds and 1/2cc for the small ones. I have done this once a day for 5 days and some still show symptoms. Should I continue to inject the ones with symptoms for a longer period of time? Did I give enough medication to begin with? Also how long do we have to wait to eat the eggs after the tylan 50 has been used? We were also giving bactrim tabs to the ones that were worse off and I know the witdrawl period for that is 10 days. Thanks for your time and advise!