Genet. Sel. Evol.
Volume 37, Number 2, March-April 2005
|Page(s)||215 - 228|
Confirmation of quantitative trait loci affecting fatness in chickensDanyel G.J. Jennena, b, Addie L.J. Vereijkenc, Henk Bovenhuisa, Richard M.P.A. Crooijmansa, Jan J. van der Poela and Martien A.M. Groenena
a Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen University, Marijkeweg 40, 6709 PG Wageningen, The Netherlands
b Institute of Animal Breeding Science, University Bonn, Endenicher Allee 15, 53113 Bonn, Germany
c Nutreco, Breeding Research Centre, P.O. Box 220, 5830 AE Boxmeer, The Netherlands
(Received 8 September 2003; accepted 16 August 2004)
Abstract - In this report we describe the analysis of an advanced intercross line (AIL) to confirm the quantitative trait locus (QTL) regions found for fatness traits in a previous study. QTL analysis was performed on chromosomes 1, 3, 4, 15, 18, and 27. The AIL was created by random intercrossing in each generation from generation 2 (G 2) onwards until generation 9 (G 9) was reached. QTL for abdominal fat weight (AFW) and/or percentage abdominal fat (AF%) on chromosomes 1, 3 and 27 were confirmed in the G 9 population. In addition, evidence for QTL for body weight at the age of 5 (BW5) and 7 (BW7) weeks and for the percentage of intramuscular fat (IF%) were found on chromosomes 1, 3, 15, and 27. Significant evidence for QTL was detected on chromosome 1 for BW5 and BW7. Suggestive evidence was found on chromosome 1 for AFW, AF% and IF%, on chromosome 15 for BW5, and on chromosome 27 for AF% and IF%. Furthermore, evidence on the chromosome-wise level was found on chromosome 3 for AFW, AF%, and BW7 and on chromosome 27 for BW5. For chromosomes 4 and 18, test statistics did not exceed the significance threshold.
Key words: quantitative trait loci / advanced intercross line / chicken / fatness traits
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