I don't know the answers, but find the topic fascinating.
It's an odd coincidence that just this morning I came across this study of salt toxicity and chickens from 1926. I had fun reading it. I have no idea if the information is accurate.
http://www.google.com/url?sa=t&rct=...sKXnDQ&usg=AFQjCNE6wEcReo9bxE1_DBu4MyfG7v5-cQ
Imp
It's an odd coincidence that just this morning I came across this study of salt toxicity and chickens from 1926. I had fun reading it. I have no idea if the information is accurate.
http://www.google.com/url?sa=t&rct=...sKXnDQ&usg=AFQjCNE6wEcReo9bxE1_DBu4MyfG7v5-cQ
Imp