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Fertilization Rates Obtained with Boar Semen Stored for Zero and Twelve Hours^{1, 2,}

University of Wisconsin,^,4 Madison

Abstract

Twenty pairs of gilts were artificially inseminated from split ejaculates with fresh semen or semen stored for 12 hours. Observations were recorded showing the type and percent motility, the percent of gilts conceiving, and the percent of recovered ova that were fertilized. An analysis of variance indicated there were no significant differences among boars, among ejaculates within boars or between fresh semen or semen stored for 12 hours. The average percent fertility for all fresh semen samples was 76.9% as compared to 83.6% for the stored samples, while the average conception rate was 90.0% and 95.0%, respectively. The association between the percent motile sperm in the fresh semen and the percent fertile ova was not significant, but the type of motility and percent fertile ova were significantly related (r=0.89, P<0.01). These factors were not significantly associated in the stored semen.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

² This study was supported in part by grants from Oscar Mayer & Co., Jones Dairy Farm, and by the Research Committee of the Graduate School with funds from the Wisconsin Alumni Research Foundation.

³ Presently, Head, Department of Dairy Science, University of Arizona.

⁴ Departments of Animal Husbandry and Dairy Husbandry.