Six-to nine-day-old embryos collected either surgically or nonsurgically from superovulated donor cows were transferred transcervically to recipient cows. Polyethylene tubes and plastic insemination pipettes were used to transfer the embryos. When embryos were transferred under controlled conditions (laboratory transfer) to 12 recipients, 10 (83.3 per cent) and eight (66.7 per cent) were tested pregnant at 45 and 90 days after transfer respectively. When transfers were made to 12 recipients under field conditions (paddock transfer), nine (75 per cent) and five (41.7 per cent) were tested pregnant at 45 and 90 days after transfer respectively. The difference in pregnancy rates between laboratory and paddock transfers was not statistically significant.
- British Veterinary Association. All rights reserved.
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