Abstract

Embryo production was studied in 1,263 donor cows. The number of transferable (good) embryos per collection was highly correlated with the total embryos and ova in a collection (r = 0.64). Total ova and embryos per collection averaged 10.1 with a range from 0–70; the number of good embryos averaged 4.5 with a range from 0–37. Of all collections, 15.3% failed to yield any embryos or ova, and 32.4% did not yield any good embryos. The percentage of good embryos averaged 46.1 while the ratio of good embryos produced (5,680) to total embryos and ova produced (12,699) was 0.45.

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