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Frequency of chromosomal abnormalities in early embryos of the domestic sheep (Ovis aries)


Frequency of chromosomal abnormalities in early embryos of the domestic sheep (Ovis aries)



Journal of Reproduction and Fertility 58(1): 197-201



ISSN/ISBN: 0022-4251

PMID: 7359478

DOI: 10.1530/jrf.0.0580197

Embryos or unfertilized eggs were collected 2 or 3 days post-coitum from mature sheep of various breeds and crosses. The karyotypes of 89 of the 376 collected were established. There were 44 embryos with 2n = 54XX, 30 with 2n = 54XY; 1 was a 2n/1n mosaic; 4 had 2n + 1 chromosomes giving an incidence of trisomy of 4.7% and 1 unfertilized egg had n = 28. The incidence of chromosomal abnormalities was 6%, and 1.3% of the eggs or embryos had a cracked zona pellucida.

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Accession: 005487435

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