贵州小型猪母猪初产繁殖性状及其相关和通径分析

摘要

Objective To screen the reproductive traits significantly associated with reproductive performance of outbred Guizhou Miniature Pigs.Methods Ten reproductive traits of 30 gilts were determined and analyzed with correlation and path analysis.The traits were as following:totol number of born (X1),number of alive born (X2),average weight at birth (X3) and litter weight (X4),average number alive(X6) and weight (X5) and litter weight (X7) at 21 days,number weaned (X8),average weaning weight (X9) and weaning weight of litter (Y).Result There were extremely significant (P＜0.01) positive correlation between weaning weight of litter and other reproductive traits.Path analysis showed that X7～X9 had positive direct effects on weaning weight of litter but X5～X6 had positive indirect effects,and X1 ～X4 had weak effects.Conclusion Compared with genetic factor,the life environment had decisive influence on weaning weight of litter.%目的 为了揭示母猪繁殖性状间的相互关系,找出影响离乳窝重的主要因子.方法 选取30头普通级封闭群贵州小型猪初产母猪,测定产仔总数(X1)、产活仔数(X2)、初生个体质量(X3)、初生窝重(X4)、21日龄活仔数(X5)、21日龄个体质量(X6)、21日龄窝重(X7)、离乳仔猪数(X8)、离乳个体质量(X9)、离乳窝重(Y)等10个繁殖性状表型值,并对各繁殖性状表型值进行相关及通径分析,以揭示母猪繁殖性状间的相互关系.结果 贵州小型猪母猪离乳窝重与各繁殖性状间均存在极显著(P＜0.01)正相关.通径分析结果表明,X7 ～ X9对离乳窝重以直接正向作用为主,X5 ～ X6对离乳窝重则以间接正向作用为主,X1 ～ X4对离乳窝重的影响则很小.结论 离乳窝重受先天遗传因素的影响较小,而受后天环境的影响较大.