You can use the dosage at the bottom of this link, either for feed or more accurately mixed in water and given orally by weight:
https://jedds.com/products/medistatin-medpet
My problem with FF is that it was so messy, and mold could be an issue on the ground. I had a lot of chickens at the...
Where did the chick come from? Did you have existing chickens at the time? It sounds like they had some respiratory disease, such as infectious bronchitis or MG, and those may cause problems throughout life, even when symptoms lessen. How is she eating? I tried fermented feed years ago for 7...