BBW and BBB are hybrids and were bred from white Holland turkeys in 1935, if I am not mistaken and they can mate(sort of, for a short period of time) if you hold down their weight. They will litterally eat themselves to death like the cornish cross chickens, but that is not very likely if you do not overfeed them. Their downfall is that they have trumendous breasts that make the males too big in the breast area to mount the female properly, but I found with a restricted diet, the first dozen or so eggs, I got when I raised these birds, were fertie and I hatched out several poults, but some were broad breasted and some were not,and one had a sunken chest ! The BB type turkey have an increased risk of heart attacks and leg broblems, because they get so heavy so fast. I now raise the Holland White heritage breed, which next to the standard bronze are the biggest Heritage Breed of turkeys I know of. The Holland Whites are only a few pounds lighter than the Standard Bronze, and easier to dress doe to their all white feathering.