Never thought I would have this problem. Just lost one of my best hens, a standard Cochin, to egg-binding. The broken eggshell punched right through her guts, and it looks like she died of internal bleeding. The apparent reason for her being egg-bound, on necropsy, is that she had wads and wads of yellow fat around her large intestine and oviduct. We're talking, morbidly obese, absolutely jam-packed full of fat, hardly any room for organs in there. I have personally never seen this much fat on a chicken--only on a goose that had been fattened for slaughter. It honestly never occurred to me that a chicken would get unhealthily overweight, although this particular chicken was indeed always first to the treat bowl and rarely went out in their yard to exercise. However, she always managed to flap her way up to the top perch at night, and that's 4 feet off the ground. These hens get Blue Seal layer feed free choice, a mix of cooked grains and fresh chopped veggies, fish, hardboiled eggs, yogurt and fruit every other day, plus whatever gets cleaned out of the crisper drawer and the cereal canisters once a week and whatever bugs and leaves they dig out of their run. It is the dead of winter up here, and I really do not want to restrict their calories just because of the warmth issue. If it were spring, that'd be different, I wouldn't feel bad about putting chubby hens on a diet. But in winter?