The Belgian Blue is a truly impressive breed of cattle. And more than a little scary! These monster
cows have a condition known as "double muscling," which arises from a genetic flaw: they lack the
gene that turns off the production of muscle.
The Belgian Blue was developed in the 1800s in Belgium, by selectively breeding the most heavily
muscled cows to each other. This good old-fashioned form of genetic manipulation quickly produced a
strain of cattle which grew to truly massive proportions.
. It is also remarkably tender, because the genetic defect means that the cattle lay down more
short-fiber muscle tissue, which is the more tender
The genetic defect which creates the Belgian Blue is also found in other animals. It was found in mice,
where it created an impressively muscled mouse which researchers dubbed "Mighty Mouse."
These cattle have a mutation in the gene which creates the production of myostatin. Myostatin is the
chemical which tells muscles to stop growing. Without myostatin, the muscles just keep piling on the
cells, and quickly create a bodybuilder physique without the work.
The heavy muscling does have some disadvantages. The cattle experience a reduced range of motion
and reduced endurance. The females find it nearly impossible to give birth, even to normal-sized
calves. All Belgian Blues are therefore born by caesarian section.
The meat of the Belgian Blue is said to be nutritionally superior to most other cuts of beef, being very
lean and therefore lower in calories