Belgian Blue cattle are a beef breed from Belgium, known in French as Race de la Moyenne et Haute Belgique. Alternative names include Belgian Blue-White, Belgian White and Blue Pied, Belgian White Blue, Blue and Blue Belgian. 
The sculpted, heavily muscled appearance is known as “double muscling”, and is a trait shared by the Piedmontese breed. They are named for their typically blue-grey mottled hair colour, although it can vary from white to black.

(Source: futurenow321)