Probiotics?? How beneficial?

[MakNat]

Are they good to give. I mean to chickens that are NOT being treated with any meds? Or just when they have been medicated? Is it beneficial for very young birds? Curious, I have some for a group that has been on antibiotics. And just wanted to know if the already healthy ones would benefit from them?

 

[WriterofWords]

I've never used them and never had trouble but my birds are not exposed to others and strangers. I hope someone with experience can give you an answer. I'll bump you up.