Genetic markers linked to quantitative traits in poultry

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Abstract
Summary: This study utilized DNA fingerprints and crosses of two genetically distinct lines of layer‐type chickens to identify genetic markers linked to quantitative trait loci (QTL). In phase I, back‐cross (BC1) hens were separately ranked for each of eight traits and then blood pools were produced in groups along each phenotypic distribution. The DNA was isolated from the blood pools and used in a gradient analysis to screen for DNA fingerprint bands that exhibited intensity gradients associated with the phenotypic traits. To identify linkage of bands with QTL and to estimate band effects, F2 progeny were produced in phase II from the phase I BC, population. A single‐trait animal model was used for analysis of associations of all individual DNA fingerprint bands of sires and their progeny phenotypic performance. Twenty fingerprint bands, only two of which had shown trait‐associated gradients in phase I, were identified by the animal model analysis of the progeny test as QTL linked (P≤005) to specific traits of growth, reproduction and egg quality. These 20 bands warrant further study as potentially valuable molecular markers for QTL.