ok, I was searching the forum for info on dog food and found this thread, a friend who has had chicks for a while told me that he was giving his the Costco dog-food "Nutro-Nuggets" Lamb and Rice and that when he used it they laid a lot more double yolked eggs and seem to really like it. I bought some and use it as a treat and to boost protien intake in the winter especially - I won't use cat-food because of the taurine, but you still want to be careful not to overfeed any dog food since they all have some salt and you don't want to give them too much, but my chicks love it and they have been laying a LOT of EGGS and BIG eggs while others in the area say their numbers are low during the winter, so for now I'm gonna stay with it, it's only about $23 for 40 pounds and even with 70 chicks, it lasts at least a month (I give them about 2- 4cup scoops a day)