中国美利奴羊生长性状和毛用性状的基因组选择研究

doi:10.16431/j.cnki.1671-7236.2025.10.023

Abstract

Abstract: 【Objective】 This study was conducted to perform a genetic evaluation and estimate the genomic breeding values of growth traits and wool traits in the core population of Chinese Merino sheep,so as to provide a foundation for breeding new ultra-fine wool sheep strains.【Method】 The core population of Chinese Merino sheep at the Xinjiang Gongnaisi Stud Farm was used as the research subject.Pedigree data,phenotypic data (including birth weight,yearling weight,daily weight gain,gross from length,shearing amount,and weight after shearing),and systematic environmental effect data were collected from individuals born between 2013 and 2022.In addition,a reference population consisting of 999 individuals from the 2023 cohort was subjected to low-depth (1×) sequencing to obtain their genotypic data.The least squares method in SAS 9.2 software was used to analyze systematic environmental effects and determine fixed effects in the model.The likelihood ratio test was conducted to compare model 1 and model 2 to assess whether including maternal genetic effects significantly impacted the model.The optimal model under these study conditions was determined and then applied using ASREML software.Genetic parameters and genomic breeding values for various traits were estimated using the ABLUP,GBLUP,and ssGBLUP methods,with validation of accuracy.【Result】 The estimated heritabilities of birth weight,yearling weight,daily weight gain,gross from length,shearing amount,and weight after shearing in the core population of Chinese Merino sheep were found to be 0.1215-0.1647,0.1434-0.3631,0.1954-0.2545,0.1398-0.1781,0.1129-0.2076,and 0.2434-0.3017,respectively,all were low to medium heritability traits.Among the different estimation methods,the highest accuracy for genomic estimated breeding values (GEBVs) was obtained using model 2 with ssGBLUP method.Compared with ABLUP method,the overall accuracy of ssGBLUP method improved by 1.48%-27.02%.【Conclusion】 Under the conditions of this study,the most accurate estimation of genetic parameters and genomic breeding values for growth and wool traits in the core population of Chinese Merino sheep was achieved using a model that incorporated both individual additive and maternal genetic effects in combination with ssGBLUP method.

Key words: Chinese Merino sheep; growth traits; wool traits; genomic selection

CLC Number:

S826.8⁺6

YAN Nana, GULIZGULINA Asghar, HANIKZ Tulav, SMUBATI Guli Shahatynur, GURSIYAR Kanish, MA Junde, WU Weiwei, LIU Lingling. Study on Genomic Selection of Growth and Wool Traits in Chinese Merino Sheep[J]. China Animal Husbandry & Veterinary Medicine, 2025, 52(10): 4776-4784.

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Study on Genomic Selection of Growth and Wool Traits in Chinese Merino Sheep

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