Variance component analysis (VCA) was used to model both additive and dominant QTL effects for weight and conformation score on chicken chromosomes 1, 4, and 5. Novel recursive software was used to estimate IBD coefficients. Variance components were estimated using ASreml. Significant dominance effects were found for weight on chromosome 5 and conformation on chromosomes 4 and 5 explaining 6, 8 and 6% of the total variance respectively. To our knowledge this is the first report of a dominance QTL detected within a commercial population using VCA. Future aims are to extend the linear model to include other non-additive effects such as epistasis and to simulate behaviour of the test statistic under varying modes of inheritance, size and structure of pedigree.

S. Rowe, R. Pong-Wong, Chris S Haley, Sara A Knott, D. J de Koning

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 20.09, 2006
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