Artificial donor insemination frozen versus fresh semen.

The results of artificial insemination by fresh and frozen donor semen (A.I.D.) are reported. Life table conception results were 66.3 +/- 3.8 after 6 months for the fresh semen group. Similar results for 2 consecutive programmes of A.I.D. of frozen semen were 44.0 +/- 4.6 and 64.2 +/- 3.4, respectively. The latter group's cumulative pregnancy rate is high and probably reflects improvement in both sperm preservation and insemination techniques. Using improved freezing techniques, the results of A.I.D. with frozen semen are equal to those with fresh semen.