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A genome scan for quantitative trait loci affecting male reproductive traits in a White Duroc x Chinese Erhualian resource population

Key Laboratory for Animal Biotechnology of Jiangxi Province and the Ministry of Agriculture of China, Jiangxi Agricultural University, 330045, Nanchang, China

Lushenghuang{at}hotmail.com

Abstract

Chinese Erhualian boars have dramatically smaller testes, higher levels of circulating androgens and less Sertoli cells than Western commercial breeds. To identify quantitative trait loci (QTL) for boar reproductive traits, testicular weight, epididymal weight, seminiferous tubular diameter at 90 d and 300 d, and serum testosterone concentration at 300 d were measured in 347 F₂ boars from a White Duroc x Chinese Erhualian cross. A whole genome scan was performed with 183 microsatellites covering 19 porcine chromosomes. A total of 16 QTL were identified on 9 chromosomes, including 1% genome-wide significant QTL for testicular weight at 90 d and 300 d and seminiferous tubular diameter at 90 d on SSCX, and for epididymal weight and testosterone concentration at 300 d on SSC7. Two 5% genome-wide significant QTL were detected for testicular weight at 300 d on SSC1 and seminiferous tubular diameter at 300 d on SSC16. Nine suggestive QTL were found on SSC1, 2, 3, 5, 7, 13, and 14. Chinese Erhualian alleles were not systematically favorable for higher reproductive performance. This study confirmed the previous significant QTL for testicular weight on SSCX and for epididymal weight on SSC7, and reported QTL for seminiferous tubular diameter and testosterone concentration at the first time. The observed different QTL for the same trait at different ages reflect the involvement of distinct genes in the development of male reproductive traits.

Key Words: reproductive trait • quantitative trait loci • boar

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