Respiratory Issues and Tylosin/Tylan

[mellephone]

Situation: 10 month old chickens (Easter Egger, Austrolorp, Orpington), eating and drinking and energetic. Some of them have diarrhea and some have white poop painted around their vents. They have tiny white spots on their combs, a few have one or two tiny black/brown spots. Four of them appear to be holding their beak open frequently. Listening to three of them, their breathing sounds clear but the fourth one keeps her mouth open a lot more than the others, I can see a bit of mucus in her throat and the roof of her mouth and when I listen to her breathing with my ear on her back it has a slight sound to it. I suspect a respiratory issue forming. Gapeworm seems less likely. I have brought that chicken inside for the night to watch her closely. She is acting normal, though her comb is paler than normal. They all laid today, and most laid yesterday. I have not had a drop in eggs. I am being super paranoid because I had a chicken unexpectedly die on Monday and I don't want to lose anyone else.

I am going to try and get into the vet in the morning but there are no avian vets here and the vet who usually treats my girls is only somewhat trained on chickens. She does the best she can. If she is not there tomorrow or if i can't get in at all I was thinking about treating them myself with Tylosin. I know time is very important in this and it can't just wait until Monday.

My local Tractor Supply sells Tylosin but the bottle says for horses, cows, goats etc. It doesn't say chickens. Is it ok to use on chickens or is this Tylosin different than the stuff my vet would inject them with? Does anyone know? If I can use it then what is the dose? Thank you to anyone who can help. I really want to get right on this and give them the best chance. Please don't suggest I cull; these are pets in a closed flock and I don't breed or sell.