Lets hope after having them on Tylan for a couple days you'll begin to noticed improvements. But remember to give the Tylan the full time it says to.There bedding is large shavings and cleaned once a week. I feed the laying pellets. I really thinks a virus of some sort because 2 od my 4 ducklings are coughing now and they have the same routin as far as cleaning I'm switching to the Tylan and hopefully a video soon thanx again