以180只3个品系的温岭草鸡为材料, 采用PCR-RFLP方法对鸡MSTN基因外显子1的2个多态位点进行研究, 并分析对屠体性状的遗传效应。Bsh1236Ⅰ识别G(2100)A突变, 产生MN和NN 2种基因型, MspⅠ识别G(2109)A突变, 产生AA、AB和BB 3种基因型, 联合2个位点分析出现了5种基因型。基因型频率在品系间的c2检验表明差异均不显著(P＞0.05)。方差分析显示不同基因型的屠宰率有显著或极显著的差异(P＜0.01或P＜0.05)。多重比较显示：杂合型MN的腹脂重和屠宰率显著(P＜0.05)高于突变型NN; 杂合型AB的胸肌重和胸肌率显著(P＜0.01或P＜0.05 )高于基因型AA, 基因型AA的腹脂重和腹脂率都极显著(P＜0.01)高于突变型BB, 在腿肌重性状上, BB型显著(P＜0.05)低于AA型和AB型；2个位点联合分析时, NA/MA基因型的腹脂重、腹脂率和胸肌率均极显著(P＜0.01)高于或低于其他基因型。

Two polymorphic sites in the first exon 1 of MSTN gene in 180 Wenling grass-chicken including 3 lines were studied by PCR-RFLP method,and its genetic effects on carcass traits were researched. The results showed that 2 genotypes (MN and NN) in G(2100)A locus were identified by Bsh1236Ⅰand 3 genotypes (AA, AB and BB) in G(2109)A locus were identified by MspⅠ, and 5 genotypes were emerged while com-analyzing 2 loci. The c2 test indicated genotype frequencies had no significant deviation (P > 0.05) among lines. The analysis of variance showed that the different genotypes had significant deviation (P < 0.01 or P < 0.05) in carcass percent. The multiple comparisons were made. The abdominal fat weight and carcass percent of heterozygosis MN were significantly higher (P<0.05) than that of mutant NN,and the breast muscle weight and breast muscle percent of heterozygosis AB were significantly higher (P < 0.01 or P < 0.05) than that of AA indi-viduals. In addition,the abdominal fat weight and abdominal fat percent of AA individuals were significantly higher (P < 0.01) than that of mutant BB individuals,but BB individuals were significantly lower (P < 0.05) than AA and AB individuals in leg muscle weight trait. The abdominal fat weight,abdominal fat percent and breast muscle percent of genotype NA/MA individuals were significantly higher or lower (P < 0.01) than those in other genotype individuals while com-analyzing 2 loci.