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I held over a BBW hen, as a year old she was laying eggs. Then she tried to nest in the weeds and got killed by a family of raccoons. The next year I had an extra hen and a tom, I kept them thinking I could try AI. When they were 1 1/2 years old, I decided that I wasn't going to have time for that project because of my work schedule and lack of help from the family so they went to Thanksgiving dinner. The tom dressed at 38 pounds, I don't remember the hen size, maybe 28 pounds? In 2009 I had an extra BBB hen and tom and thought I could try again now that I am retired. Spring 2010 my heritage toms killed the BBB tom so I just had the one hen. Some things came up so I didn't incubate any eggs, I thought I could try the following spring and breed her to my Regal Red tom. Unfortunately, when she was close to 2 years old a heavy snow load collapsed my building and she broke her leg so I had to put her down. Now I have a BBW hen hatched in spring 2010 and one from this year. Neither has any difficulty getting around, my 6 month old still perches 4 feet off of the ground. Somebody in another group I belong to had a BB tom pass at 9 years old, I believe to heart failure. They took him to schools so kids could interact with a live turkey and he was quite the gentleman. It is very possible to keep a BB turkey alive and thriving. No, they can't fly after they get too big, but they can still have a good life.
It is true to say that they have to be mated with a heritage tom (or AI), but they can be kept more than long enough to produce fertile eggs. The really critical part (in my opinion) is to keep the growth slow during the rapid growth stage. After that, watch corn intake and encourage foraging and exercise.