We just got 7 new hens in the spring to add to the two existing hens. All are healthy, doing well, and starting to lay. The three Barred Plymouth Rocks we got have developed into what you would call "healthy" girls if you were trying to be polite. One of them though, Florida, is downright fat. She is in with the rest of the flock; they all get the same feed. I am sparing with the scratch, they get a lot of veggies from the garden, get to free range for a couple of hours every evening and on weekends but this one chicken is huge. She has started to not walk around as much and when out of the run with the others she spends more time lying around. She still makes it up on the perch at night but she is definitely a little lethargic. My question is, is this more common in the Barred Rocks? Could it be another health issue causing the weight gain? All the others seem fine and Florida even seems fine aside from the weight. Any suggestions on how to fix this?