Factors affecting the fertility of ewes after intrauterine insemination with frozen-thawed semen during the non-breeding season.

In this study, two successive field trials were conducted during the non-breeding season to investigate various factors affecting on fertility of Suffolk ewes after intrauterine insemination with frozen-thawed semen. In the first year (Experiment 1), three sperm numbers per insemination dose (0.25, 0.