Based on chicken' consensus map issued in 2000,17 microsatellites near 4 candidate genes such as IGF2,OBR,GDF8 and APOA1 in 4 chromosomes(chromosome 5,7,8 and 24)were chosen for polymorphism analysis and construction of linkage map.Combining the technique of PCR and the fluorescent semi-automated detection,genome scanning was performed for 440 chickens,which was derived from China Agricultural University chicken resource families within three generations.The individuals of this resource families were genotyped.The results showed that the number of alleles ranged from 4 to 14;heterozygosity(H) of markers was between 0.3116 and 0.9148.Polymorphic information content(PIC)varied from 0.2672 to 0.8679.Microsatellites along with above-mentioned 4 candidate genes doing as general markers were used to construct linkage map.The spans of 4 linkage maps constructed in the part region of chromosome 5,7,8 and 24 were 263.5,79.9,206.2 and 104.2 cM,respectively.The order of markers was consistent with that of counterpart of reported consensus map.However,The spans of linkage map were larger than that of consensus map.The constructed linkage maps laid the foundation for mapping quantitative trait loci(QTL)responsible for economically important traits in chicken.
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