I would like to know why when I changed over to the Purina Layena with Oyster why did I start to get bad eggs? I had no bad eggs before this the hens were laying nice large beautifully hard shelled eggs and then they slowly started to do really funky things. First they began to get smaller, then wrinkled, then the egg shell quality went down, I was getting less and less eggs to where I may have gotten an egg every three days (when they were laying 5 eggs each a week), then I started to get eggs with very light shells that would break when the chicken would expelied it, then with no shells at all and of course the one that came that was just plain stinky and gross. And before you say it I did not take away their oyster shell. I am still having problems with one bird she has not come back from it all yet. THE ONLY thing that I changed at that time was the food. Since I have gone back to the other food that I was feeding prior my production is better not where I want it but better, after all these things do take time and we are in a VERY hot summer and they have begun to molt my egg shell quality is better and the eggs are larger. So can you all tell me WHY?