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Frequency of chromosomal abnormalities in embryos from superovulated Merino ewes

Summary. Chromosomal analysis was carried out on 48 Day 2–7 embryos collected from superovulated Merino ewes. Three embryos had abnormal chromosome complements (1 x IN, 1 x 1N/2N, 1 x 3N), yielding an incidence of 6·25% abnormal embryos. It is concluded that superovulation does not cause an increase in the incidence of chromosomal abnormalities in embryos of Merino sheep.