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Genome-wide identification of quantitative trait loci for pork temperature, pH decline, and glycolytic potential in a large scale 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

The pH values and temperatures at 45-min, 3, 9, 15, and 24-h postmortem in M. Longissimus dorsi (LD) and M. Semimembranous (SM) and glycolytic potential in LD were measured in 1,030 F₂ animals from a White Duroc x Erhualian resource population. A whole genome scan was performed with 183 microsatellites covering 19 porcine chromosomes to detect quantitative trait loci (QTL) for traits measured. A total of 73 QTL have been identified, including 1% genome-wise significant QTL for 24-h pH in LD and SM on pig chromosome (SSC) 15, and for glycolytic potential, total glycogen, and residual glycogen on SSC3, 6, and 7. Six 5% genome-wise significant QTL were detected for 9-h pH in SM on SSC3, pH decline from 3/9-h to 24 h in SM on SSC7, glycolytic potential on SSC1, and total glycogen on SSC1 and 6. This study confirmed QTL previously identified for pH except those on SSC1, 11, 12, and X, and found 11 new 5% genome-wise significant QTL for glycogen related traits. This is the first time to report QTL for pH development during post-slaughter and for glycolytic potential at 5% genome-wise significance level. In addition, the observed different QTL for pH and pH decline at different times show that causal genes for pH postmortem play distinct roles at specific stages and(or) in specific muscles. These results provide a starting point for fine mapping of QTL for the traits measured and improve the understanding of the genetic basis of pH metabolism after slaughter.

Key Words: glycolytic potential • pH • pig • quantitative trait loci • temperature