Heritabilities and genetic and phenotypic correlations of litter uniformity and litter size in Large White sows  

作　　者：ZHANG Tian WANG Li-gang SHI Hui-bi YAN Hua ZHANG Long-chao LIU Xin PU Lei LIANG Jing ZHANG Yue-bo ZHAO Ke-bin WANG Li-xian 

机构地区：[1]Key Laboratory of Farm Animal Genetic Resources and Germplasm Innovation, Ministry of Agriculture,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences

出　　处：《Journal of Integrative Agriculture》2016年第4期848-854,共7页农业科学学报（英文版）

基　　金：supported by the Agricultural Science and Technology Innovation Program, China (ASTIPIAS02);the National Key Technology R&D Program of China (2011BAD28B01);the National Natural Science Foundation of China (31201781);the Earmarked Fund for Modern Agro-Industry Technology Research System, China (2011ZX08006-003);the Chinese Academy of Agricultural Sciences Foundation (2014ZL006, 2011cj-5, 2012ZL069 and 2014ywf-yb-8)

摘　　要：Litter uniformity, which is usually represented by within-litter weight coefficient of variation at birth （CVB）, could influence litter performance of sows and the profitability of pig enterprises. The objective of this study was to characterize CVB and its effect on other reproductive traits in Large White sows. Genetic parameters and genetic correlation of the reproductive traits, including CVB, within-litter weight coefficient of variation at three weeks （CVT）, total number born （TNB）, number born alive （NBA）, number born dead （NBD）, gestation length （GL）, piglet mortality at birth （Mo）, piglet mortality at three weeks （M3）, total litter weight at birth （TLW0）, and total litter weight at three weeks （TLW3） were estimated for 2 032 Large White litters. The effects of parity and classified litter size on CVB, CVT, TNB, NBA, NBD, GL, M0, M3, TLW0, and TLW3 were also estimated. The heritabilities of these reproductive traits ranged from 0.06 to 0.17, with the lowest heritability for CVB and the highest heritability for TLW0. Phenotypic and genetic correlations between these reproductive traits were low to highly positive and negative （ranging from -0.03 to 0.93, and -0.53 to 0.93, respectively）. The genetic correlations between TNB and CVB, and between M0 and CVB were 0.32 and 0.29, respectively. In addition, CVB was significantly influenced by parity and litter size class （P〈0.05）. All the results suggest that piglet uniformity should be maintained in pig production practices and pig breeding programs.Litter uniformity, which is usually represented by within-litter weight coefficient of variation at birth （CVB）, could influence litter performance of sows and the profitability of pig enterprises. The objective of this study was to characterize CVB and its effect on other reproductive traits in Large White sows. Genetic parameters and genetic correlation of the reproductive traits, including CVB, within-litter weight coefficient of variation at three weeks （CVT）, total number born （TNB）, number born alive （NBA）, number born dead （NBD）, gestation length （GL）, piglet mortality at birth （Mo）, piglet mortality at three weeks （M3）, total litter weight at birth （TLW0）, and total litter weight at three weeks （TLW3） were estimated for 2 032 Large White litters. The effects of parity and classified litter size on CVB, CVT, TNB, NBA, NBD, GL, M0, M3, TLW0, and TLW3 were also estimated. The heritabilities of these reproductive traits ranged from 0.06 to 0.17, with the lowest heritability for CVB and the highest heritability for TLW0. Phenotypic and genetic correlations between these reproductive traits were low to highly positive and negative （ranging from -0.03 to 0.93, and -0.53 to 0.93, respectively）. The genetic correlations between TNB and CVB, and between M0 and CVB were 0.32 and 0.29, respectively. In addition, CVB was significantly influenced by parity and litter size class （P〈0.05）. All the results suggest that piglet uniformity should be maintained in pig production practices and pig breeding programs.

关 键 词：genetic parameter litter uniformity litter size piglets mortality 

分 类 号：S828[农业科学—畜牧学]