I have been giving my Cuckoo Maran hen Duramycin-10 for about 5-6 days, I have mixed with water and added vitamins. This doesn't seem to help her URI to much. She is still sneezin and a wheezin. She seems fine otherwise, eats well, no weight loss, no other symptoms. She is an avid free ranger. My question is, I would like to start giving her Tylan 50 orally, do I have to wait a few days or can I go right into giving her the Tylan 50 tomorrow? Today she was still drinking the water with the Duramycin in it. Thanks for any advice