摘要
繁殖性状是养羊业中重要的经济性状之一。本研究旨在探究影响天目多胎羊繁殖性状的非遗传因素及其遗传参数,所用数据来自浙江赛诺生态农业有限公司2014—2022年的5335头天目多胎羊的繁殖性能记录,包括胎产羔数、胎羔羊平均初生重、胎总产羔重和胎羔羊存活数。运用SAS8.1和DMU软件分析非遗传因素对繁殖性状的影响,估计遗传参数和育种值,并进一步探讨遗传趋势和表型趋势。结果表明:胎次、产羔年份和产羔类型对各性状均有极显著影响(P<0.01)。胎产羔数、胎羔羊平均初生重、胎总产羔重和胎羔羊存活数的直接遗传力估计值分别为0.016、0.063、0.049、0.034,均为低遗传力性状。胎产羔数与胎羔羊平均初生重在遗传和表型上均呈负相关,胎羔羊平均初生重与胎羔羊存活数在遗传上呈正相关,但两者在表型上呈负相关,其余性状在遗传和表型上均呈正相关。胎产羔数的平均育种值呈先上升后下降趋势,平均表型值整体呈上升趋势;胎羔羊平均初生重和胎总产羔重的平均育种值整体呈先下降后上升趋势,平均表型值呈先上升后下降趋势;羔羊存活数的平均育种值和平均表型值均呈先上升后下降趋势。本研究为天目多胎羊繁殖性状的遗传改良奠定了基础,同时也为育种工作提供了指导。
Reproductive traits are one of the important economic traits in the sheep industry.The purpose of this study was to explore the non-genetic factors affecting the reproductive traits of Tianmu multiparous sheep and their genetic parameters.In this study,the reproductive performance records of 5335 Tianmu multiparous sheep from 2014 to 2022 were collected from Zhejiang Sino Ecological Agriculture Co.,Ltd.,including litter size at birth(LSB),litter mean weight per lamb born(LMWLB),total litter weight at birth(TLWB)and litter survival lamb numbers(LSLN).SAS 8.1 and DMU softwares were used to analyze the effects of non-genetic factors on reproductive traits,estimate genetic parameters and breeding values,and further analyze genetic trends and phenotypic trends.The results showed that birth parity,year of lambing and type of lambing had extremely significant effects on all traits(P<0.01).The direct heritability estimates of LSB,LMWLB,TLWB and LSLN were 0.016,0.063,0.049 and 0.034,respectively,indicating that these were low heritability traits.The LSB was negatively correlated with LMWLB both genetically and phenotypically.The genetic correlation between LMWLB and LSLN was positive,but their phenotypic correlation was negative.The genetic and phenotypic correlations of the remaining traits were both positive.The average breeding value of LSB first increased and then decreased,and the average phenotypic value showed an overall upward trend.The average breeding values of LMWLB and TLWB first decreased and then increased,and the average phenotypic value first increased and then decreased.The average breeding value and average phenotypic value of LSLN first increased and then decreased.This study has laid a foundation for the genetic improvement of reproductive traits of Tianmu multiparous sheep,and also provided guidance for breeding work.
作者
李雪
洪巍
刘桂芬
魏晨
何军敏
张果平
张文静
龙丽
杨存明
田可川
黄锡霞
LI Xue;HONG Wei;LIU Guifen;WEI Chen;HE Junmin;ZHANG Guoping;ZHANG Wenjing;LONG Li;YANG Cunming;TIAN Kechuan;HUANG Xixia(Institute of Animal Science and Veterinary Medicine,Shandong Academy of Agricultural Sciences,Jinan 250100,Shandong,China;College of Animal Science,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China;Zhejiang Sino Ecological Agriculture Co.,Ltd.,Hangzhou 311300,Zhejiang,China)
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2024年第6期954-962,共9页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
山东省农业科学院农业科技创新工程专项资金项目(CXGC2023F10,CXGC2023A33)。
关键词
天目多胎羊
繁殖性状
遗传参数
育种值
遗传趋势
Tianmu multiparous sheep
reproductive traits
genetic parameters
breeding value
genetic trend
