I would like the answer to this question as well!! My girls are 6 1/2 months old, and I have gotten a whopping 3 eggs from them!! ARGH!!
And now I am only getting one egg a day, from the new cochin ladies that were added last week, and not from my 6 1/2 month olds. And since my mom has taken all her girls home (YAY!) we are no longer getting fresh eggs, save one egg from the Cochins....
ARGH!! 
I use the feed from my local feedstore, not sure what brand, but it is in pelleted form. They eat it fine, but I don't like it. Seems like the bag runs dry faster than crumbles. Mash lasts even longer it seems, but the girls had a hard time eating the mash. The feed store where I normally get my crumbles was closed until yesterday. They had closed down to remodel or something. I am wondering if I switch back to the crumbles, maybe I will get eggs? They were on the crumbles when I got 3 eggs before.