Hey thought someone might need this, so last year one of my chickens started to limp then she started hoping on one leg I did a lot of research and found out it was a vitamin definitionce and chickens can die very quickly from it . So I found something that's called poultry cell, I gave some to the whole flock, in just a few days she went from barely walking out of the coop to running around like nothing happened! Hope this helps someone's little feathery friends!