I have two Wyandottes that are about a year old now. When I first got them in January they had lice, worms, and they were sneezing. I gave them some vitamins, probiotics, wormers, etc and they made a full turn around. The problem I have now is that they (one more than the other) are seriously over weight. They pig out every day and have giant crops every night. One is so large I can barely pick her up and I can barely feel her keel bone! I have done the obvious.. Cut out all treats.. No scratch grains, and I am giving vitamins. We had a sudden warm up over the weekend and the 2 girls were sleeping a lot and panting. Sometimes even standing tail down. I think they are too heavy to tolerate the heat. Unfortunately my flock has been exposed to Mareks disease, so I am worried that I'm wrong and it's Mareks again. However.. When we brought the two chubby girls in the garage where it was cooler they seemed to do better. The heavier one is having a hard time breathing some times. I just wish there was something else I could do. Does it take a long time for chickens to lose weight?? Not looking for suggestions saying I should put her down or have these two for dinner. Our chickens are our pets and we care about them. Thanks for any advice anyone might have.