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Genome-wide association study of bone mineral density trait among three pig breeds

  • B. Jiang (a1), M. Wang (a1) (a2), Z. Tang (a1), X. Du (a3), S. Feng (a1), G. Ma (a2), D. Ye (a1), H. Cheng (a1), H. Wang (a3) and X. Liu (a1) (a2)...

Abstract

Leg weakness (LW) issues are a great concern for pig breeding industry. And it also has a serious impact on animal welfare. To dissect the genetic architecture of limb-and-hoof firmness in commercial pigs, a genome-wide association study was conducted on bone mineral density (BMD) in three sow populations, including Duroc, Landrace and Yorkshire. The BMD data were obtained by ultrasound technology from 812 pigs (including Duroc 115, Landrace 243 and Yorkshire 454). In addition, all pigs were genotyped using genome-by-sequencing and a total of 224 162 single-nucleotide polymorphisms (SNPs) were obtained. After quality control, 218 141 SNPs were used for subsequent genome-wide association analysis. Nine significant associations were identified on chromosomes 3, 5, 6, 7, 9, 10, 12 and 18 that passed Bonferroni correction threshold of 0.05/(total SNP numbers). The most significant locus that associated with BMD (P value = 1.92e−14) was detected at approximately 41.7 Mb on SSC6 (SSC stands for Sus scrofa chromosome). CUL7, PTK7, SRF, VEGFA, RHEB, PRKAR1A and TPO that are located near the lead SNP of significant loci were highlighted as functionally plausible candidate genes for sow limb-and-hoof firmness. Moreover, we also applied a new method to measure the BMD data of pigs by ultrasound technology. The results provide an insight into the genetic architecture of LW and can also help to improve animal welfare in pigs.

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Genome-wide association study of bone mineral density trait among three pig breeds

  • B. Jiang (a1), M. Wang (a1) (a2), Z. Tang (a1), X. Du (a3), S. Feng (a1), G. Ma (a2), D. Ye (a1), H. Cheng (a1), H. Wang (a3) and X. Liu (a1) (a2)...

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