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Mapping quantitative trait loci affecting fatness and breast muscle weight in meat-type chicken lines divergently selected on abdominal fatness

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Author(s): Lagarrigue Sandrine | Pitel Frédérique | Carré Wilfrid | Abasht Behnam | Le Roy Pascale | Neau André | Amigues Yves | Sourdioux Michel | Simon Jean | Cogburn Larry | Aggrey Sammy | Leclercq Bernard | Vignal Alain | Douaire Madeleine

Journal: Genetics Selection Evolution
ISSN 0999-193X

Volume: 38;
Issue: 1;
Start page: 85;
Date: 2006;
Original page

Keywords: quantitative trait locus | abdominal fat | breast muscle | chicken

ABSTRACT
Abstract Quantitative trait loci (QTL) for abdominal fatness and breast muscle weight were investigated in a three-generation design performed by inter-crossing two experimental meat-type chicken lines that were divergently selected on abdominal fatness. A total of 585 F2 male offspring from 5 F1 sires and 38 F1 dams were recorded at 8 weeks of age for live body, abdominal fat and breast muscle weights. One hundred-twenty nine microsatellite markers, evenly located throughout the genome and heterozygous for most of the F1 sires, were used for genotyping the F2 birds. In each sire family, those offspring exhibiting the most extreme values for each trait were genotyped. Multipoint QTL analyses using maximum likelihood methods were performed for abdominal fat and breast muscle weights, which were corrected for the effects of 8-week body weight, dam and hatching group. Isolated markers were assessed by analyses of variance. Two significant QTL were identified on chromosomes 1 and 5 with effects of about one within-family residual standard deviation. One breast muscle QTL was identified on GGA1 with an effect of 2.0 within-family residual standard deviation.

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