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Poult Sci 2006. 85:2079-2096
© 2006 Poultry Science Association
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INVITED REVIEWS

Review of Quantitative Trait Loci Identified in the Chicken

B. Abasht, J. C. M. Dekkers and S. J. Lamont1

Department of Animal Science, Iowa State University, Ames 50011

1 Corresponding author: sjlamont{at}iastate.edu

Methods for mapping QTL are actively used in the chicken to identify chromosomal regions contributing to variation in traits related to growth, disease resistance, egg production, behavior, and metabolic parameters. However, higher-resolution mapping and better knowledge of the genetic architecture underlying QTL are needed for successful application of this information into breeding programs. Therefore, this paper summarizes and integrates original, primary QTL studies in the chicken to identify basic information on the genetic architecture of quantitative traits in chickens. The results of this review show several instances of consensus of QTL locations for similar traits from independent studies. Furthermore, the consensus of QTL location for different traits and evidence for QTL with parent-of-origin effect, transgressive alleles, epistatic QTL, and QTL x sex interaction in chicken are presented and discussed. This information can be helpful in identifying genes or mutations underlying the QTL and in the application of genomic information in marker-assisted breeding programs.

Key Words: chicken • quantitative trait loci • genetic architecture • high-resolution mapping • marker-assisted breeding




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