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  • Title: Frequency of chromosomal abnormalities in early embryos of the domestic sheep (Ovis aries).
    Author: Long SE, Williams CV.
    Journal: J Reprod Fertil; 1980 Jan; 58(1):197-201. PubMed ID: 7359478.
    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 mouse; 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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