I've got ten hens and one drake, all mixed breed, Ancona, Rouen/Khaki, Khaki/Runner, Pekin, Cayuga, etc. I feed them Purina Layena Crumble, no added oyster shell. I was feeding them cracked corn, which apparently lowers their protein which is needed for laying, so I stopped the corn, which was something I did in winter to fatten them up. I have a 40w bulb that's on from 8 to 1030pm. They have fresh water every day and a pool they unfortunately and inevitably drink from, but which I change every week. I recently got rid of two extra drakes and began feeding them extra food, not realizing I was only feeding them all about two pints of food, so now about a quart's worth, supplemented by the occasional bread/veggie/fruit scraps. They graze in an ~80x40 fenced area and are secured in their overconstructed coop (2x4 and tin) at night between 830pm-8am. Any suggestions? I've done tons of research and often refer to Dave Holderread's Raising Ducks Guide.