In the Chinese Merino prolific meat strain, the genotype frequencies of BB, B+ and ++ were 51%, 30% and 19%, respectively, whereas all the other flocks had only the wild-type (++) genotype.

• 在中国美利奴肉用多胎品系中BB、B+和++基因型频率分别为51%25、30%25和19%25；而其他品种（系）羊中则仅有++基因型。