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| Research article summary (published 30 Aug 1998): |
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Identification of quantitative trait loci affecting carcass composition in swine: II. Muscling and wholesale product yield traits.
Full Abstract
A genomic scan was conducted on 540 reciprocal backcross Meishan x White composite pigs for hot carcass weight (HCWT); loin eye area (LOIN); carcass length (CRCL); belly weight (BELLY); and weight of trimmed ham, loin, picnic, and Boston butt adjusted to a constant live (TWPLWT) or carcass (TWPCWT) weight. Genetic markers spanned the entire porcine linkage map and were spaced at approximately 20-cM intervals. Grandparental breed of origin for all chromosomal segments was determined using multipoint linkage procedures, and a least squares regression analysis was conducted. Nominal P-values were converted to a genome-wide level of significance to adjust for the number of tests actually conducted. Seven associations were significant at the genome-wide level relating to chromosomes 1 (SSC 1), 7 (SSC 7), and X (SSC X). The SSC 1 region affected LOIN, TWPLWT, and TWPCWT; SSC 7 affected HWCT and CRCL; and SSC X affected TWPLWT and TWPCWT. Twelve associations relating to seven chromosomal regions (including SSC 1 and X) presented suggestive evidence for quantitative trait loci (QTL), and many of these regions are likely to contain QTL. Chromosomes 8 and 14 had two and three traits with suggestive evidence for QTL, respectively. Many pleiotropic effects were detected for regions on SSC 1, 7, 14, and X in this study and a companion study looking for fat deposition QTL in the same population. In addition, SSC 4 was nearly significant for CRCL in the same region identified as affecting backfat in a wild boar x Large White population. These results expand our knowledge of the inheritance of quantitative traits and are directly relevant to composite populations containing Meishan germplasm.
Author information
Author/s: Rohrer, G A (GA); Keele, J W (JW);
Affiliation: U.S. Meat Animal Research Center, USDA, ARS, Clay Center, NE 68933, USA.
Journal and publication information
Publication Type: Journal Article
Journal: Journal of animal science (J Anim Sci), published in UNITED STATES. (Language: eng)
Reference: 1998-Sep; vol 76 (issue 9) : pp 2255-62
Dates: Created 1999/01/12; Completed 1999/01/12; Revised 2003/11/14;
PMID: 9781480, status: MEDLINE (last retrieved date: 2/18/2009)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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