Belgian Blue
Belgian Blue cattle are also called "monster cows". They are a heavily-bred breed, producing incredible amounts of meat. The problem is that they have trouble supporting themselves and they are unable to give birth without caesarean section.
Some countries (including Sweden) do not allow Belgian Blues.
This breed has a natural mutation of the gene that codes for myostatin, a protein that counteracts muscle growth. The truncated myostatin is unable to function in this capacity. This mutation also interferes with fat deposition, resulting in very lean meat.
Their sculpted, heavily muscled appearance is known as "doubled muscled", a trait shared by the Piedmontese breed.
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