Since mid July I have lost (on average) 1-3 chickens per month. The symptoms are typically the same- beginning with a lethargic chicken. They then progress into unbalanced chickens with drooping wings and poop all over their rears. The chickens then proceed to slowly die, typically after twisting their necks back and forth? 
I have tried giving them fish mox (amoxicillin). It helps, until it doesn't.
I have another sick chicken, and honesty I just feel horrible for them! I have no clue what is happening. I am debating killing the whole flock of them.
My oldest hens (2-5 years old) have not died at all. It has only been chickens 1 year and younger. Any advice would be appreciated!

I have tried giving them fish mox (amoxicillin). It helps, until it doesn't.
I have another sick chicken, and honesty I just feel horrible for them! I have no clue what is happening. I am debating killing the whole flock of them.

My oldest hens (2-5 years old) have not died at all. It has only been chickens 1 year and younger. Any advice would be appreciated!
