宁夏地区头胎荷斯坦牛产奶和体型性状基因组估计育种值与表型值相关性案例分析OA

This study aimed to conduct correlation analysis between genomic estimated breeding values(GEBV)and phenotypic values of milk production with conformation traits of first-lactation Holstein cows in Ningxia.We collected and organized the phenotypic and genomic estimated breeding values of first-lactation Holstein cows in 11 large-scale dairy farms in Ningxia from January 2020 to December 2024.4 165 cows had both genomic estimated breeding values and milk production traits,and 1 581 dairy cows had both genomic estimated breeding values and conformation traits.Descriptive statistical analysis and Pearson correlation analysis were performed using the SPSS 25.0 software.The results showed that there was a highly significant weak to moderate positive correlation between the GCPI index of first-lactation Holstein cows in Ningxia and the measured milk yield,milk fat rate,milk fat content,milk protein rate,milk protein content,305-day milk yield,body volume,rump,hooves,dairy characteristics,milking system,and total body shape score,and a weak correlation with SCS.The pheno-typic values of milk yield,milk fat rate,milk protein rate,milk fat content,milk protein content,hooves,and total body shape score had a highly significant weak positive correlation with the corresponding genomic estimated breeding values of the traits,while the phenotypic val-ues of SCS and the milking system had a weak and no significant correlation with the corresponding genomic estimated breeding values of the traits.This study reported the correlation between genomic estimated breeding values and phenotypic values of milk production with body shape traits of first-lactation Holstein cows in Ningxia and revealed the genome selection effect of first-lactation Holstein cows in Ningxia,which might be a reference for future genetic improvement of Holstein cow populations in Ningxia.