宁都黄公鸡睾丸质量与不同周龄第二性征的回归与主成分分析  

Regressive and Principal Component Analyses of Testis Weight and Secondary Sexual Characteristics at Different Weeks of Ningdu Huang Roosters

作　　者：周敏[1,2] 朱学农 谭玉文[1,2] 章逸 王远彬 罗锦胜[1] 朱沙 余艳 郑世军 ZHOU Min;ZHU Xuenong;TAN Yuwen;ZHANG Yi;WANG Yuanbin;LUO Jinsheng;ZHU Sha;YU Yan;ZHENG Shijun(Nanchang Normal University,Nanchang 330029,China;Jiangxi Province Key Lab of Genetic Improvement of Indigenous Chicken Breeds,Nanchang 330029,China)

机构地区：[1]南昌师范学院,江西南昌330029 [2]江西地方鸡种遗传改良重点实验室,江西南昌330029

出　　处：《河南农业科学》2019年第9期148-156,共9页Journal of Henan Agricultural Sciences

基　　金：国家自然科学基金项目(31160454,31560630);江西省教育厅科技项目(GJJ18079);江西省自然科学基金项目(2008GZN0043)

摘　　要：为了研究宁都黄公鸡睾丸质量与不同周龄第二性征指标的内在关联性,以宁都黄公鸡为研究对象,测定了16周龄的睾丸总质量和7个不同周龄的第二性征指标,分析了各性状间的相关系数,并对16周龄睾丸总质量与不同周龄第二性征指标进行了回归分析和主成分分析。结果表明,在所测的指标中16周龄睾丸总质量的变异系数最大,为85.89%,冠长、冠高、冠厚、肉垂长、肉垂厚等第二性征性状的变异系数在15.40%~37.90%,胫的变异系数最小,在5.13%~11.77%;除了与16周龄胫直径不相关外,宁都黄公鸡16周龄睾丸总质量与不同周龄鸡冠、肉垂、胫等性状的各指标间存在显著(P<0.05)或极显著(P<0.01)正相关,与16周龄冠长的相关系数最大(0.688);逐步回归分析结果表明,从12周龄开始,冠长对16周龄睾丸总质量的影响最大,其次是肉垂长;由主成分分析结果可知,从12周龄开始,16周龄睾丸总质量与冠长、冠高、冠厚和肉垂长度可归为同一主成分。以上结果提示,可以通过选择12周龄的冠长与肉垂长这2个指标对宁都黄公鸡16周龄睾丸总质量进行间接选育。This experiment was conducted to study the internal correlation between testicular weight and secondary sexual characteristics at different weeks in Ningdu Huang roosters.Total testicular weight at 16 weeks of age and secondary sexual characteristics at 7 different weeks were measured.The correlation coefficients between these traits were analyzed.Moreover,regression and principal component analyses were performed among the total testicular weight at 16 weeks of age and secondary sexual characteristics at 7 different weeks.The results showed that among the characteristics measured,the variation coefficient of total testicular weight at 16 weeks of age was the largest(85.89%).The variation coefficients of secondary sex characteristics such as comb length,comb height,comb thickness,length of wattle and thickness of wattle were 15.40%—37.90%,and the variation coefficients of shank were the smallest(5.13%—11.77%).The total testicular weight at 16 weeks of age was significantly(P<0.05)or extremely significantly positivly correlated(P<0.01)with comb,wattle and shank traits at different weeks,except for shank diameter at 16 weeks,in Ningdu Huang roosters.The correlation coefficient between total testicular weight at 16 weeks of age and the comb length at 16 weeks of age was the largest(0.688).Stepwise regression analysis showed that the comb length had the greatest effect on the total testicular weight at 16 weeks of age from 12 weeks,followed by the wattle length.According to the results of principal component analysis,the total testicular weight at 16 weeks of age,comb length,comb hight,comb thickness and wattle length could be classified into the same principal component from 12 weeks.These results indicated that the comb length and the wattle length at 12 weeks of age should be considered as important indicators in the breeding for total testicular weight at 16 weeks of age in Ningdu Huang roosters.

关 键 词：宁都黄公鸡 睾丸质量 第二性征 回归分析 主成分分析 

分 类 号：S831.2[农业科学—畜牧学]