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I know that this CAN happen and there are a lot of warnings in the old literature about it causing decreased egg production. I've only seen a good deal of intra abdominal fat in some cockerels that we had - who were put into a small enough pen that they couldn't run around like lunatics fighting all the time, and they were fed a good deal of corn because it was an exceptionally cold winter for us. Otherwise, our Javas are lean birds with minimal fat anywhere, even in the old hens we've processed. I would say that either this is an isolated occurrence with this one bird and how she processed food, or their diet regimen needs tweaking if you find it in more birds.
Well, for whatever it's worth, I had a group of Naked Necks from Ideal received in September, and growing up outside into the winter in a tractor covered with a tarp, very low tech. It wasn't super cold (I'm in South Texas), they had sufficient shelter, but it was chilly, and definitely not cozy. They were paddocked, but the paddock was quite big. (Yes, I finally got their extravagant coop built.)
Anyway, I culled the extra cockerels I wasn't keeping in late December. They included both NN and Nn boys (with the Nn having noticeably more feathers than the NNs). There was a LOT of fat in the NNs - it was STRIKING (I had the same reaction as you). But it looked healthy, and they were healthy, no fatty liver, etc. Much more than in the Nns. I am thinking that it was their bodies' reaction to the cold. The pullets in this same group (including the NNs with the least feathers) went into lay starting at 20 weeks, and lay REALLY REALLY well, and there's no reason to think they wouldn't have had the same fatty reaction.
I've not seen this when I cull in hot weather.
So, this may not be your situation, but FWIW, I would think that if these birds (however well suited to the cold) had the opportunity to be really cold this winter, it could just be that maybe. I wouldn't worry if you're not feeding them too much corn/scratch and they get exercise. Just enjoy and make some schmalz!!!!
- Ant Farm