生物技术通报 ›› 2018, Vol. 34 ›› Issue (6): 102-108.doi: 10.13560/j.cnki.biotech.bull.1985.2017-0806

• 研究报告 • 上一篇    下一篇

无角牦牛体尺性状对体重影响的通径分析

裴杰1,2 ,王宏博1,2 ,褚敏1,2 ,扎西卓玛3 ,包鹏甲1,2 ,梁春年1,2 ,骆正杰4 ,武甫德4 ,丁学智1,2 ,吴晓云1,2 ,阎萍1,2 ,郭宪1,2   

  1. 1. 中国农业科学院 兰州畜牧与兽药研究,兰州 730050;
    2. 甘肃省牦牛繁育工程重点实验室,兰州 730050;
    3. 青海省海西州动物疫病预防控制中心,德令哈市 817099;
    4. 青海省大通种牛场,西宁 810102
  • 收稿日期:2017-09-25 出版日期:2018-06-26 发布日期:2018-07-03
  • 作者简介:裴杰,男,副研究员,研究方向:动物遗传学;E-mail:douglaspei@126.com
  • 基金资助:
    国家自然科学基金项目(31402034),现代农业(肉牛牦牛)产业技术体系建设专项(CARS-37),中国农业科学院科技创新工程(CAAS-ASTIP-2014-LIHPS-01)

Analysis of Effects of Body Sizes on the Weight of Polled Yak

PEI Jie1,2 ,WANG Hong-bo1,2 ,CHU Min1,2 ,ZHA Xi-zhuo-ma3 ,BAO Peng-jia1,2 ,LIANG Chun-nian1,2 ,LUO Zheng-jie4 ,WU Pu-de4 ,DING Xue-zhi1,2 ,WU Xiao-yun1,2 ,YAN Ping1,2 ,GUO Xian1,2   

  1. 1. Lanzhou Institute of Husbandry and Pharmaceutical Sciences,Chinese Academy of Agricultural Sciences,Lanzhou 730050;
    2. Key Laboratory of Yak Breeding Project in Gansu Province,Lanzhou 730050;
    3. Animal disease prevention and control center of Haixi prefecture in Qinghai Province,Delingha 817099;
    4. Datong Cattle Farm in Qinghai Province,Xining 810102
  • Received:2017-09-25 Published:2018-06-26 Online:2018-07-03

摘要: 旨在通过无角牦牛体尺性状对其体重作较为准确的估计,剖分牦牛各体尺性状对体重的影响。实验随机选取247头8-10月龄的无角牦牛为研究对象,其中公牛155头,母牛92头;测量各牦牛的体长、体高、胸围和管围4个体尺数据,并称量其体重;采用逐步线性回归的方法建立无角牦牛体重与体尺的多元线性回归方程;利用通径分析的方法计算各体尺性状对体重的直接作用和间接作用。结果表明,公牛的胸围和管围之间的相关系数未达到显著水平(P>0.05),其他各性状之间的表型相关系数均达到了极显著水平(P<0.01);公牛和母牛体重与体尺的多元线性回归方程分别为Y=-86.969+0.338X1+1.082X3+0.905X4和Y=-85.693+0.440X2+0.860X3+1.972X4,其中Y为体重(kg)、X1为体高(cm)、X2为体长(cm)、X3为胸围(cm)、X4为管围(cm),回归方程算得的体重估计值与体重实际观察值之间差异不显著;胸围对体重的直接作用大于其他体尺性状的直接作用,并大于其他形态性状通过胸围而影响体重的间接作用。结果提示,本研究建立的多元线性方程可应用于无角牦牛的良种选育实践,通径分析结果表明影响无角牦牛体重的主要因素来自于其胸围指标。

关键词: 无角牦牛, 体尺, 体重, 多元线性回归, 通径分析

Abstract: The aim of this study is to accurately estimate the weight of polled yak by its body size,and to subdivide the effects of body parts’ sizes on the weight. In the experiment,247 polled yaks aging 8 to 10 months,155 male yaks and 92 female yaks,were randomly selected as objects of the study. Four body size data of body length,standing height,chest circumference,and cannon bone circumference,as well as a yak’s weight were measured. Multiple linear regression equations were established by stepwise multiple linear regression. Then the direct and indirect effects of each body size on weight were calculated by path analysis. The results suggested that the correlation between chest circumference and cannon circumference of male yak did not reach significant difference(P >0.05),and the phenotypic correlations among other traits reached extremely significant difference(P < 0.01). There was no significant difference between the estimated values and the observed values of the weight. The direct effect of chest circumference on the weight was greater than the effects of the other body parts’ sizes,and greater than the indirect effect of chest circumference through the other body parts’ sizes. In conclusion,the multiple linear regression equations can be used for selective breeding practice in polled yak,and the path analysis suggests that the dominant factor of impacting polled yak weight was the chest circumference.

Key words: polled yak, body size, weight, multiple linear regression, path analysis