Genetic Polymorphism of Structural Loci of Milk Protein in Non-dairy Type Goats

doi:10.3321/j.issn:1000-7091.2007.01.014

Abstract

Abstract: The objective of this experiment was to understand the genetic polymorphism of structural loci encoding milk protein in different Chinese non-dairy type goat populations, to reveal the genetic relationship among those goat populations. Genetic polymorphism of 7 structural loci encoding milk protein (enzyme) of 316 individuals from 9 Chinese non-dairy type goat populations was analyzed by PAGE, and the clustering of these goat populations was researched based on the allele frequency of 5 structural loci encoding milk protein. In 9 goat populations, κ-CN, β-CN, α_s1-CN, α_s2-CN, β-Lg, SAand LDH 7 structural loci encoding milk protein (enzyme) took on different extent genetic polymorphism on PAGE gel. The mean gene homozygosity, mean gene heterozygosity and mean number of effective allele is 0.3350, 0.6552 and 1.8199 based on the gene frequency of κ-CN, β-CN, α_s2-CN, β-Lg and SA respectively. The 9 Chinese goat populations were classified as 2 groups based on the gene frequency of κ-CN, β-CN, α_s2-CN, β-Lg and SA. In 9 Chinese non-dairy type goat populations, the structural loci encoding milk protein were relatively abundant system of genetic diversity; we think that structural loci of encoding milk protein have a relatively strong representation in the classification of non-dairy goat populations.

Key words: Non-dairy goat, Milk protein, Structural locus, Genetic polymorphism, Analysis of clustering

CLC Number:

S827.01

BAI Wen-lin, YIN Rong-huan, ZHENG Yu-cai, ZHAO Su-jun, ZHANG Shou-chun, WANG Jie. Genetic Polymorphism of Structural Loci of Milk Protein in Non-dairy Type Goats[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(1): 59-63. doi: 10.3321/j.issn:1000-7091.2007.01.014.

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