I bought a bag of Purina flockraier and Dumor layer crumbles from TSC last weekend. I normally have my hens on Nutrena layer crumbles from my local feed store. My chickens seemed a little thin, bored with the food, i had a coupon and when they were chicks I had used flockraiser before without issue. They are also fed scratch, BOSS, mealworms when available and scrapes. We also had a very tough winter.. I live in upstate NY.. They laid all winter no issues. They were born last spring. I mixed the food so they weren't getting too much protein and gettinng enough layer. Less than a week on it.. I had 2 hens with bloody butts and one dead chicken!! With lots of tlc, reading and research I was able to bring the other two hens around. They are back on Nutrena and have electrolytes/vitamins in thier water until I know the rest of them will be ok. So food gone bad? Switch too much? Dumor crumbles was all the same percentages as Nutrena? I didnt add too much flockraiser at once.. Just kind of as a boost.. All i know is Never again will i use again!!