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

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Abstract
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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