Department: University of Delaware. Department of Animal and Food Sciences.
Publisher: EDP Sciences
Date Issued: 2006
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 meattype
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.
Lagarrigue, S., Pitel, F., Carré, W., Abasht, B., Le Roy, P., Neau, A., . . . Douaire, M. (2006). Mapping quantitative trait loci affecting fatness and breast muscle weight in meat-type chicken lines divergently selected on abdominal fatness. Genetics Selection Evolution, 38(1), 85-97. doi:10.1051/gse:2005028