I recently was looking at ingredients on the bags of feed I buy my flock, and was comparing brands since prices have gone so high. I came across the 'Farmers Best' brand awhile ago, and had decided to try it. Right away I noticed their 'flock raiser' was a grey color, (versus Purina, which is yellow) and I noticed the occasional corn kernel in it. I started to feed it (slowly switching brands in a mixture at first) and quite quickly noticed my hens started dropping off ALOT in the laying dept. I switched back to Purina real quick and they started laying again. Back to my point.... I recently saw Limestone listed as the 3rd ingredient on the 'Farmers Best' brand!! I dont know if feed labels are the same as human food labels, (where the first 5 ingredients are what there is the most of in something), but I just cant imagine feeding ROCKS (albeit in 'crumble' form) to my flock. How can that be considered food? Is there some kind of nutrition in Limestone that I dont know about? Wouldnt it be almost 1/3 of what the feed is made of? Am I missing something? The Purina brand does not have limestone listed as an ingredient anywhere on its list of ingredients. Seems weird to me. Is it actually common and accepted in feed for chicknes?