Quantitative trait loci for fatty acid composition in longissimus dorsi and abdominal fat: results from a White Duroc x Erhualian intercross F2 population.

A whole-genome scan was performed on 660 F(2) animals including 250 barrows and 410 gilts in a White Duroc x Erhualian intercross population to detect quantitative trait loci (QTL) for fatty acid composition in the longissimus dorsi muscle and abdominal fat. A total of 153 QTL including 63 genome-wide significant QTL and 90 suggestive effects were identified for the traits measured. Significant effects were mainly evident on pig chromosomes (SSC) 4, 7, 8 and X. No association was detected on SSC3 and 11. In general, the QTL detected in this study showed distinct effects on fatty acid composition in the longissimus muscle and abdominal fat. The QTL for fatty acid composition in abdominal fat did not correspond to those identified previously in backfat and the majority of QTL for the muscle fatty acid composition were mapped to chromosomal regions different from previous studies. Two regions on SSC4 and SSC7 showed significant pleiotropic effects on monounsaturated (MUFA) and polyunsaturated fatty acid (PUFA) in both longissimus muscle and abdominal fat. Another two QTL with significant multi-faceted effects on MUFA and PUFA in the longissimus muscle were found each on SSC8 and SSCX. Chinese Erhualian alleles were associated with increased ratios of MUFA to saturated fatty acid at most of the QTL detected, showing beneficial effect in terms of human health.

Guo T ，Ren J ，Yang K ，Ma J ，Zhang Z ，Huang L ... -  《-》

Genome-wide identification of quantitative trait loci for carcass composition and meat quality in a large-scale White Duroc x Chinese Erhualian resource population.

Carcass and meat quality traits are economically important in pigs. In this study, 17 carcass composition traits and 23 meat quality traits were recorded in 1028 F(2) animals from a White Duroc x Erhualian resource population. All pigs in this experimental population were genotyped for 194 informative markers covering the entire porcine genome. Seventy-seven genome-wide significant quantitative trait loci (QTL) for carcass traits and 68 for meat quality were mapped to 34 genomic regions. These results not only confirmed many previously reported QTL but also revealed novel regions associated with the measured traits. For carcass traits, the most prominent QTL was identified for carcass length and head weight at 57 cM on SSC7, which explained up to 50% of the phenotypic variance and had a 95% confidence interval of only 3 cM. Moreover, QTL for kidney and spleen weight and lengths of cervical vertebrae were reported for the first time in pigs. For meat quality traits, two significant QTL on SSC5 and X were identified for both intramuscular fat content and marbling score in the longissimus muscle, while three significant QTL on SSC1 and SSC9 were found exclusively for IMF. Both LM and the semimembranous muscle showed common QTL for colour score on SSC4, 5, 7, 8, 13 and X and discordant QTL on other chromosomes. White Duroc alleles at a majority of QTL detected were favourable for carcass composition, while favourable QTL alleles for meat quality originated from both White Duroc and Erhualian.

Ma J ，Ren J ，Guo Y ，Duan Y ，Ding N ，Zhou L ，Li L ，Yan X ，Yang K ，Huang L ，Song Y ，Xie J ，Milan D ，Huang L ... -  《-》

Quantitative trait loci mapping for fatty acid composition traits in perirenal and back fat using a Japanese wild boar x Large White intercross.

Nii M ，Hayashi T ，Tani F ，Niki A ，Mori N ，Fujishima-Kanaya N ，Komatsu M ，Aikawa K ，Awata T ，Mikawa S ... -  《ANIMAL GENETICS》

The effects of single and epistatic quantitative trait loci for fatty acid composition in a Meishan x Duroc crossbred population.

Uemoto Y ，Sato S ，Ohnishi C ，Terai S ，Komatsuda A ，Kobayashi E ... -  《-》

A genome scan for quantitative trait loci affecting three ear traits in a White Duroc x Chinese Erhualian resource population.

Ma J ，Qi W ，Ren D ，Duan Y ，Qiao R ，Guo Y ，Yang Z ，Li L ，Milan D ，Ren J ，Huang L ... -  《-》