MyoG基因对猪部分生长性状的影响

XUE Hui-Liang , ZHOU Zhong-Xiao
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引用次数: 12

摘要

采用PCR-SSCP技术对长白猪、大白猪、杜roc猪、山西黑猪和马山猪进行MyoG基因单核苷酸多态性检测,并分析MyoG基因对仔猪初生重、断奶重、6月龄体重和背膘厚的影响。根据已公布的猪MyoG基因序列,设计了10对引物,用In2-3引物扩增的PCR产物中发现1个多态性。结果表明:(1)长白猪、大白猪和杜洛克猪品种差异显著(P <山西黑、马山品种基因型分布差异0.05);(2)根据固定效应模型,不同MyoG基因型仔猪出生体重和背膘厚差异显著,断奶体重和6月龄体重差异不显著;(3)通过最小二乘分析,发现BB基因型个体的(P <0.01)出生体重比AA和AB基因型高,排序为:AA>AB>BB;AA基因型猪的血清素含量显著降低(P <0.01)背膘厚比AB和BB基因型高,顺序为AA<AB<BB。这些结果表明,基因型对个体初生体重和背膘厚度有显著影响,且在初生体重和背膘厚度方面有利于A等位基因的选择。
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Effects of the MyoG Gene on the Partial Growth Traits in Pigs

Single-nucleotide polymorphisms of the MyoG gene were tested using PCR-SSCP in different pig breeds including Landrace, Large White, Duroc, Shanxi Black, and Mashen pigs, and the effects of the MyoG gene on the birth weight, the weaning weight, the 6-month body weight, and the backfat thickness were also analyzed. On the basis of the published sequence of the porcine MyoG gene, ten pairs of primers were designed, and one polymorphism was found in the PCR product amplified with In2-3 primers. The results showed that: (1) the Landrace, the Large White, and the Duroc breeds differ significantly (P < 0.05) in genotype distribution from the Shanxi Black and the Mashen breeds; (2) On the basis of the fixed effect model, significant differences were found in the birth weight and the backfat thickness among the different MyoG genotypes, whereas no significant differences existed in the weaning weight and the 6-month body weight; (3) Using least square analysis, it was seen that individuals of the BB genotype had significantly less (P < 0.01) birth weight than those of the AA and AB genotypes, with the order being AA>AB>BB; the pigs of the AA genotype had significantly lower (P < 0.01) backfat thickness than those of the AB and BB genotypes, with the order being AA<AB<BB. These results suggest that the genotype has significant effects on the individual birth weight and the backfat thickness, and that the selection of the A allele is favored with regard to the birth weight and the backfat thickness.

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