标准化生产牦牛屠宰性状的主成分分析

Principal component analysis of carcass traits of yak under standardized production conditions

为了探究标准化生产的牦牛屠宰性状之间的相关性,选取了年龄和体重相近的麦洼牦牛和金川牦牛各15头饲养100 d后屠宰,测定了11个屠宰性能指标,并进行了主成分分析。结果表明,屠宰后麦洼牦牛脾重为0.75 kg,高于金川牦牛的0.57 kg,且差异极显著(P<0.01),其余各指标无显著差异(P>0.05);麦洼牦牛肝重和肾重变异系数分别为11.28%和14.81%,金川牦牛肝重和肾重变异系数分别为12.39%和11.76%,暗示这两个指标还有一定的选育潜力;主成分分析确定了3个主成分,累积贡献率达70.844%,第一主成分可反映牦牛的体重情况,第二主成分可反映牦牛的脾脏和肝脏发育情况,第三主成分可反映牦牛肾脏重量情况。

In order to explore the difference and correlation of yak laughter traits under standardized production conditions,we selected 15 Maiwa yaks and 15 Jinchuan yaks which with similar age and weight,then all the animals were slaughtered after breeding 100 days.11 slaughter traits such as were determined and analyzed statistically.The results showed that the spleen weight of Maiwa yak was 0.75 kg,higher than that of Jinchuan yak(0.57 kg),and the difference was significant(P<0.01),while the other indicators showed no significant difference(P>0.05).The variation coefficients of liver weight and kidney weight in Maiwa yak were 11.28%and 14.81%,respectively,and those in Jinchuan yak were 12.39%and 11.76%,respectively,which suggesting that these two indexes have breeding potential.Three principal components were identified by principal component analysis,and the cumulative contribution rate was up to 70.844%.The first principal component could reflect the weight of yaks,the second principal component could reflect the development of spleen and liver of yaks,and the third principal component could reflect the kidney weight of yaks.