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Incidence of chromosomal aberrations and primary sex ratio were examined in first-cleavage golden hamster eggs obtained after natural mating and ovulation. Fertilized eggs were 413 (97.6%) of 423 eggs prepared. Among them 408 eggs (98.8%) were in mitosis, and the chromosomes could be analysed in 336 eggs (82.4%). The incidences of numerical chromosome aberrations were 1.2% for triploidy, 0.9% for hyperdiploidy and 0.6% for hypodiploidy. The incidence of structural aberrations was 1.5% of the eggs analysed. Sexing was achieved in 285 eggs (85.3%), including 281 diploid and 4 triploid eggs. The diploid eggs contained 155 males and 126 females, giving a sex ratio of 55.2% without significant deviation from equality. Sex-chromosome combinations in the triploid eggs were XXX in 3 eggs and XXY in 1 egg, and no XYY constitution was observed. Jpn. J. Zootech. Sci., 61 (9): 824-830, 1990

An Analysis of Chromosome Abnormalities and Sex Ratio in 1-cell Stage Golden Hamster Embryos