乳蛋白位点对泌乳性状遗传效应的研究  

GENETIC EFFECTS OF MILK PROTEIN LOCI ON FIRST LACTATION TRAITS

作　　者：罗军[1] 邱怀[1] 王双合 

机构地区：[1]西北农业大学动物科学系,甘肃省宁县农业局

出　　处：《畜牧兽医学报》1996年第4期308-314,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：博士点基金

摘　　要：本文采用聚丙烯酰胺凝胶电泳法分析了７４７头中国黑白花奶牛乳样中的４种乳蛋白的基因型，同时利用最小二乘模型和基因替代模型研究乳蛋白位点对奶牛第一胎泌乳性状的遗传效应，并首次提出数量性状的位点决定遗传力（Ｌｏｃｉ－ｄｅｃｉｄｉｎｇＨｅｒｉｔａｂｉｌｉｔｙ，ｈ）的概念。结果表明，Ｋ－ＣＮ基因型对乳脂率和干物质率有显著效应，β－ＬＧ基因型对乳中干物质率的效应值显著。α＿（ｓ１）－ＣＮ位点Ｂ基因对Ｃ的替代显著影响３０５ｄ产奶量，对乳脂率无显著效应，β－ＣＮＡ￣１基因的替代对３０５ｄ产奶量、乳脂率和乳蛋白率均有显著影响作用。３０５ｄ产奶量、乳脂率、乳蛋白率和乳中干物质率的乳蛋白位点决定遗传力分别为９．４％，８．８％，９．２％和６．７％。The milk protein genotypes of 747 Chinese Holstein were analysed using PAGE tostudy the genetic effects of milk protein loci on the first lactation traits by least squaremodel and gene substitution model.The new concept which defined as the“Loci-deci-ding Heritability,h”of quantitative trait was proposed in this study for the firsttime.The results showed that genotypes of к-CN had a significant effect on milk fatand dry matter percentage;there was a significant effect of β-LG genotypes on milkdry matter percentage.Gene substitution of B for C at αS1-CN locus showed a greateffects on 305-d milk yield and not on fat percentage,gene substitution of A1 at β-CN locus exerted a significant effect on 305-d milk yield,fat percentage and milkprotein percentage.The Loci-deciding heritability of milk protein loci for 305-d milkyield,fat percentage,milk protein percentage and dry matter percentage were 9.4%,8.8%,9.2%and 6.7%respectively.

关 键 词：乳蛋白位点 基因替代模型 位点决定遗传力 

分 类 号：S823.91[农业科学—畜牧学]