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Journal of Animal Science, Vol 79, Issue 11 2812-2819, Copyright © 2001 by American Society of Animal Science

JOURNAL ARTICLE

Detection and characterization of quantitative trait loci for meat quality traits in pigs

D. J. de Koning, B. Harlizius, A. P. Rattink, M. A. Groenen, E. W. Brascamp and J. A. van Arendonk
Animal Breeding and Genetics Group, WIAS, Wageningen University, Wageningen, The Netherlands, 6700 AH.

In an experimental cross between Meishan and Dutch Large White and Landrace lines, 785 F2 animals with carcass information and their parents were typed for molecular markers covering the entire porcine genome. Linkage was studied between these markers and eight meat quality traits. Quantitative trait locus analyses were performed using interval mapping by regression under two genetic models: 1) the line-cross approach, where the founder lines were assumed to be fixed for different QTL alleles and 2) a half-sib model where a unique allele substitution effect was fitted within each of the 38 half-sib families. The line-cross approach included tests for genomic imprinting and sex-specific QTL effects. In total, three genome-wide significant and 26 suggestive QTL were detected. The significant QTL on chromosomes 3, 4, and 13, affecting meat color, were only detected under the half-sib model. Failure of the line-cross approach to detect the meat color QTL suggests that the founder lines have similar allele frequencies for these QTL. This study provides information on new QTL affecting meat quality traits. It also shows the benefit of analyzing experimental data under different genetic and statistical models.


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