摘要
逐个测定 139头F2 代杂交猪 (Susscrofa) (英系大白猪×梅山猪 )的初生重、180日龄活重 (LWT180 )、日增重(ADG)、相对生长率 (RGR)和KR值等 5个生长性状 ,对每一个体分别进行 2 4个微卫星座位的基因分型。对性别、家系和标记与生长性状的关系进行分析 ,结果显示 :它们与这些生长性状没有显著关联 (P >0 0 5 )。以 2 4个中性微卫星座位的杂合度来表示个体基因杂合度 ,比较猪生长性状在各个体基因杂合度水平间的差异 ,并分析其变化规律。结果表明 :初生重从个体基因杂合度水平为 1( 1 5 185kg)时至杂合度水平为 2 ( 1 30 6 3kg)时达性状最低值 ,之后随基因杂合度水平的增加而增加 ;180日龄活重、日增重、相对生长率和KR值等 4个重要经济性状随个体基因杂合度的增加呈近似于正弦函数曲线变化 ,在个体基因杂合度水平 2 (杂合度为 0 5 796 )时的性状值最高 ,之后随着个体基因杂合度的增加而降低。同一性状在不同的个体基因杂合度水平表型值不同 ,在某一特定的杂合度水平时达最高 ,提示在猪选配时将个体基因杂合度控制在恰当的水平 ,可以使目的性状的表型值最高。
Genotypes of 24 microsatellite loci were assayed in total of 139 F 2 finishing pigs from resource population(Large White×Meishan) in the present study.There were not significant correlation in sex,family and microsatellite loci effects on birth weight (BW),average daily gain (ADG),adjusted weight of 180 d (LWT180),relative growth rate (RGR) and kleiber ratio (KR).Individual gene heterozygosity (H i) was estimated by using 24 microsatellites.The 139 individuals were classified into five clusters based on H i by stepwise 0.05 and the traits mentioned above were compared between H i levels.Birth weight decreased significantly from gene heterozygosity level 1(0.5101 H i and 1.5185 kg) to level 2(0.5796 H i and 1.3063 kg,P<0.05),the difference was 0.2123 kg equal to 14.66% of population average birth weight (1.4479 kg).And then the birth weight increased significantly with the gene heterozygosity increasing (P<0.05).There were nonlinear relationships between LWT180,ADG,RGR,KR and individual gene heterozygosity,and mostly like the pattern of sinusoidal curve.The peaks were located at about heterozygosity level 2(averagely H i 0.5796).ADG,RGR and KR at heterozygosity level 2 were significantly higher than level 4(28.7 g/d,0.0375 and 0.0003 respectively,P<0.05).The differences were equal 7.38%,3.99% and 2.20% to respective average population values.
基金
"973"国家重大基础研究项目 (编号 :G2 0 0 0 0 16 10 5 )
国家高技术研究发展计划专项经费及博士点基金资助~~
关键词
个体基因杂合度
日增重
活重
杂种优势
猪
individual gene heterozygosity
average daily gain
liveweight
heterosis
swine
