Double-muscled phenotype of Belgian Blue and Piedmontese beef cattle was caused by mutation of 11bp deletion and substitution of conserved base in bioactive region of myostatin gene(MSTN).

• “双肌”肉牛品种比利时蓝(Belgian Blue)和皮德蒙特(Piedmontese)分别是由于MSTN3’保守的生物活性区11bp的缺失和保守碱基的点突变所造成的；