猪几个血清蛋白质位点的等位基因频率在选育中的变化趋势

采用淀粉凝胶电泳测定了杜洛克猪的转铁蛋白(Tf)、前白蛋白(Pa)、血液结合素(Hpx)、铜兰蛋白(Cp)和淀粉酶(Am)多态性，统计和计算了表现型数和等位基因频率，并同1968年测得的基因频率进行了比较，揭示了杜洛克猪几个血清蛋白质位点的等位基因频率在长期选育中的变化趋势，即随着人们有目的地进行选育，这些血清蛋白质位点的等位基因数减少，基因频率向某个等位基因集中，形成优势等位基因。目前的优势等位基因是Tf^B、Pa^A、Hpx^3、Cp^B、Am^8。此外，将杜洛克猪的基因频率同湖南部分地方猪进行了比较，计算了它们的平均杂合度、遗传相似系数和遗传距离系数，并做了聚类分析。

Varied Tendency of Allele Frequency of Several Serum Protein Loci in Pigs during Stock Selection

The polymorphism of Tf,Pa, Hpx, Cp, Am, of Duroc pigs was investigated using the method of horizonal starch gel electrophoresis. The number of the phenotypes and allele frequencies were calculated and compared with the allele frequencies determined in 1968 The varied tendency of the allele frequencies of the serum protein loci during stock selection was revealed. The number of alleles of serum protein loci was decreased, and the allele frequencies concentrated on an allele to form the superior allele. The present superior alleles are Tf B, Pa A, Hpx 3, Cp B and Am B. Moreover, the gene frequency of Duroc pigs was compared with that of a Hunan native pig species. Their average heterozygosity, genetic similarity coefficient and standard genetic distance were calculated, and cluster analysis was performed.