Abstract
A total of 44 ova with apparently normal morphology were collected nonsurgically from Holstein cows (I to VII-para) for basic breeding. They were transported to a place about 70 km distant and transplanted into the uterine horn on the same side with the ovary containing a corpus luteum in 44 nulliparous Holstein cows. These cows were selected in such manner that they showed estrus 24 hours or less before or after that in the donor cows. The transplantation was completed in 4-8 hours after collection when it was done by operation at the flank or by way of the cervical canal.
As a result, 18 cows (40.9%) were judged to be pregnant by the rectal examination performed about 40 and 60 days after estrus noticed before the transplantation. It was anticipated that this technique might make it possible to apply the transplantation of fertilized ova to practical purposes.
