At first i was buying layena crumbles and it seemed like my chickens just went crazy over it. There was significant difference in appearance also, their combs got brighter and bigger and their feathers shiny and more colorful, one of my hens laid 5!!! eggs in one day! With crumbles they laid 2-3 eggs a day, And now im getting at least 1 egg from each hen a day. When giving them purina oyster crumbles the eggs had nice glossy shell with a good shape, but i decided about a month ago that they must like pellets better and now im struggling with it they dont want to eat the pellets, they would eat crumbles untill its gone, but with pellets they will only eat some, and shells of some eggs are porous now, some are different texture. Its taking them a long time to finish this 50lb bag of pellets, and i can't wait to get rid of it and buy crumbles again. Hopefully i don't have to buy another brand because my dog food is purina brand too.