Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (1): 99-109.doi: 10.11843/j.issn.0366-6964.2024.01.011

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Genetic Mechanism of Broiler Leg Disease Based on Genome-Wide Association Analysis

TANG Xinxin1,2, ZHENG Jumei2, LUO Na2, YING Fan3, ZHU Dan3, LI Sen3, LIU Dawei3, AN Bingxing2, WEN Jie2, ZHAO Guiping2*, LI Hegang1*   

  1. 1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
    2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    3. Xinguang Farming & Animal Husbandry Co. in Gaoming District of Foshan City, Foshan 528000, China
  • Received:2023-08-04 Online:2024-01-23 Published:2024-01-24

Abstract: This study aimed to reveal the genetic mechanism of leg disease in broilers, with the objective of mitigating the incidence of leg disease in broilers. This study employed a comprehensive approach involving 2 331 white-feathered broilers of multi-strain and multi-generation of "Guangming No. 2" independently bred in China. The assessment of leg health and diseases was performed by X-ray analysis at 42 days of age. For genotyping, the "Jingxin No.1" 55K SNP microarray was used for all individuals, and the genome-wide association study (GWAS) of leg health phenotypes was performed utilizing a logistic regression model tailored for dichotomous traits via plink software. After the integration and meticulous quality control of microarray data across diverse populations, a total of 2 330 individuals (including 2 256 healthy and 74 leg disease subjects) and 30 414 SNPs loci were deemed suitable for subsequent analysis. Through the GWAS analysis, 5 potential SNPs loci, distributed on chromosomes 6 and 18, were identified. Additionally, the investigation led to the annotation of 3 functional candidate genes, namely TBCD, SIRT1, and PBLD, which are directly related to leg disease. This study results provide important genetic loci and candidate genes for the healthy leg phenotype of white-feathered broilers, and provides a genetic basis for advancing the breeding process of broiler disease resistance.

Key words: white-feathered broiler, leg disease, genome-wide association analysis, candidate genes

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