Originally Posted by COWCHICK77
Just curious, what is the birth weight of their offspring?
I found this: Belgian Blue - Wikipedia, the free encyclopedia
Breed issues 
The neonatal calf is so large that Caesarean sections are routinely done. Double-muscled cows also can experience dystocia, even when bred to normal beef bulls or dairy bulls, because of a narrower birth canal. In addition to the dam’s reduced pelvic dimensions, the calf’s birth weight and width are increased, in turn making parturition harder. The bull’s testicular weight and semen quantity and quality have been observed as reduced, however this seems to be less of an issue when compared to the dam's difficulties calving.
COWCHICK I don't think these guys would be much fun to run up the fence hey?