That makes a little more sense, though I have never had reproductive issues do to too much fat. I do not have too much fat on my hens, so maybe that is why. Earlier on before I learned to handle them, I might have had some hens with too much fat, and not known it. I free feed my birds, but they are allowed to range most days at least. I think it is more likely in birds that are fed poorly balanced rations in confinement.
I have a few hens or pullets prolapse through the years. More earlier on with commercial layers than sense then, and they were usually pullets. It seams that every now and then, you get one that seams susceptible. I have had a couple egg bound hens to. Again, more with the commercial layers early on. I can probably think of a few of each over a couple decades so it is at least rare.
I shouldn't have commented. Now I will have two of each this year.
We haven't had much visible fat in our birds, it's been intra-abdominal fat that you would never know was there until you butchered them. Makes it harder to know how your feeding regimen is doing if you can't see the fat building up.