基于基因组信息估计中国美利奴羊羊毛纤维直径和弯曲性状的遗传参数

doi:10.16431/j.cnki.1671-7236.2025.10.026

Abstract

Abstract: 【Objective】 The genetic parameters of wool fiber diameter and bending traits were estimated using genomic information in Chinese Merino sheep from the Xinjiang Gongnaisi sheep farm.【Method】 Whole genome resequencing was performed for 1 520 yearling sheep and 836 adult ewes from 2022 to 2023.Pedigree data were collected,and 8 traits,including mean fiber diameter (MFD),fiber diameter standard deviation (FDSD),fiber diameter coefficient of variation (FDCV),percentage of fiber content with diameter less than 30 μm (CF),standard deviation of average fiber diameter along profile (APSD),curvature number (CN),mean fiber curvature (MFC),and fiber curvature standard deviation (FCSD),were measured using OFDA and other instruments to yield a total of 18 496 data points.Kinship matrices were constructed based on pedigree and genome information respectively,and multi-trait animal models were established to estimate genetic parameters using ASREML software with the average information maximum likelihood method.【Result】 The heritability ranges for wool traits based on pedigree information were 0.066-0.859 and 0.088-0.782 in yearlings and adults respectively,and the heritabilities of all traits based on genomic information were high for yearlings (0.349-0.684),and medium to high for adult ewes (0.125-0.941).The four traits of CF,APSD,CD,and CDSD,investigated for the first time in Chinese Merino sheep,had the higher heritability values of 0.445,0.403,0.684 and 0.635 respectively in yearlings,and moderate to high heritability of 0.776,0.125,0.471,and 0.624 respectively in adult ewes.The MFD estimated based on genomic information in yearlings and adult ewes showed a high positive genetic correlation with FDSD (P＜0.01),and a high negative genetic correlation with CF (P＜0.01);MFC and FCSD showed a high positive genetic correlation (P＜0.01).【Conclusion】 Based on genomic information,it was estimated that the wool fiber diameter and bending traits of Chinese Merino sheep were highly heritable in yearlings ewes,and moderately to highly heritable in adult ewes.There was a high negative genetic correlation between CF and MFD in yearlings and adult ewes,while the genetic and phenotypic correlations between MFC and FCSD were the highest.The estimation of genetic parameters based on genomic information had improved accuracy,providing a reference for understanding the variation in fiber diameter and bending traits in the Chinese Merino sheep population and further improving breeding programs.

Key words: Chinese Merino sheep; wool traits; pedigree; genome; genetic parameters

CLC Number:

S826

TANG Liping, YU Lijuan, ZHANG Yanwei, ZHENG Peiyu, WANG Jiajun, XIE Mengwan, MA Haiye, LIU Xuan, SONG Nannan, LI Jingping, YUE Chengguang, ZHANG Qianwen, LI Zhonghui, LI Wenrong, DI Jiang. Estimation of Genetic Parameters for Fiber Diameter and Bending Traits of Wool Fibers in Chinese Merino Wool Based on Genomic Information[J]. China Animal Husbandry & Veterinary Medicine, 2025, 52(10): 4809-4821.

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Estimation of Genetic Parameters for Fiber Diameter and Bending Traits of Wool Fibers in Chinese Merino Wool Based on Genomic Information

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