Mapping QTL affecting growth traits in chicken chromosomes 9, 10, 12, 14, 15, 16, 17 and 18 / Mapeamento de QTL nos cromossomos 9, 10, 12, 14, 15, 16, 17 e 18 da galinha doméstica (Gallus gallus) que influenciam características de desempenho

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

An F2 chicken population was developed by crossing broiler line (TT) with a layer line (CC). Seven males TT were mated with seven females CC to generate an F1 population. Each male F1 was then mated with three unrelated females F1 generating approximately 100 individual per family of dam. On the present study 5 families were used, which showed the greatest number of informative markers in previews studies of chromosomes 1 to 5 of the resource population. Phenotypic dada were collected for body weight at 1 (BW1), 35 (BW35) and 41 (BW41) days of age, weight gain (WG35- 41), feed intake (FI35-41) and feed efficiency (FE35-41) from 35 to 41 days of age. The parental and F1 individuals were genotyped for 35 microsatellite markers distributed on chromosomes 9, 10, 12, 14, 15, 16, 17 and 18. The informative markers were genotyped on the F2 from the selected families. Chromosome 16 was excluded, because the only available marker was not informative. On chromosome 17 only one marker was informative, therefore a single marker analysis was used to associate the marker with the selected characteristics. The linkage map of each chromosome was constructed and compared to the consensus map. The linkage maps showed the same marker ordering compared to the consensus map, however small discrepancy between markers distances were presented. Interval mapping using regression methods was applied to a line-cross and least square analysis, using the QTL Express program, on the F2 analyses option. On chromosome 17, two characteristics were associated to the marker genotype: WG35-41 (P<0.05) and FE35-41 (P<0.01). Suggestive QTLs were detected for BW35, BW41, WG35-41 and FE35-41 on chromosome 10. A QTL x family interaction effect was statistically significant for FE35-41. QTLs for BW35, BW41 and WG35-41 showed addictive effects, only FE35-41 showed dominance effect.

ASSUNTO(S)

qtl marcador molecular mapeamento genético gallus gallus cromossomos traços quantitativos melhoramento genético animal galinhas – desempenho microsatellite marker

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