Chromosomal abnormalities in early embryos and commercial chicks and hatchability in reproduction flocks of layer and broiler hens
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The frequency of chromosomal abnornalities in 16-18 hour embryos and one-day commercial chicks from parental flocks of layer (Astra S) and broiler (Astra B) hens as well as results of fertilization and hatchability in these flocks were compared. A karyotype analysis of Astra S showed that 6.5% of the embroys and 2.6% of the chicks were with chromosomal abnormalities. In the flock of Astra B hens only 3.0% of the embryos and 1.1% of the chicks had abnormal karyotype.Triploidy and chimerism were the most frequently identified abnormalities in both Astra A and Astra B flocks. No significant differences in the frequency of particular types of chromosomal aberrations were found between Astra S and Astra B flocks, except translocation and <tetraploidy> which were observed only among Astra S hens. The percentage of hatchability from set and fertile eggs in Astra S flock was 80.5 and 84.8 and that in Astra B was 84.3 and 88.3, respectively. The revealed differences in the frequency of chromosome aberrations and in the hatchability between the studied flocks of layer and broiler hens may result from genetic make-up of the strains and lines utilized for production of cross-bred chicken, such as the parental stocks of Astra S and Astra B.
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