It doesn't matter where you get them, there will always be a dud every now and then, and sometimes the whole lot will be duds. Don't beat yourself up about it. Even buying from proven breeders brings duds occasionally too.
I temporarily forgot your particular circumstances, sorry, lol, was busy with other threads too, trying to be helpful. Really I'm still quite the learner myself, but some things everyone takes for granted are new things to others, you never know what will help.
I guess with your chooks I would just keep trying to treat through diet and keep an eye on them. Not much else you can do unless you're willing to spend out on a lab diagnosis which may not help at all. The panting is a bit worrying but no point fretting if you can help it; they'll either make it or they won't. Sorry, not much help, it's one of those things. Best wishes.
I temporarily forgot your particular circumstances, sorry, lol, was busy with other threads too, trying to be helpful. Really I'm still quite the learner myself, but some things everyone takes for granted are new things to others, you never know what will help.
I guess with your chooks I would just keep trying to treat through diet and keep an eye on them. Not much else you can do unless you're willing to spend out on a lab diagnosis which may not help at all. The panting is a bit worrying but no point fretting if you can help it; they'll either make it or they won't. Sorry, not much help, it's one of those things. Best wishes.