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Effect of Seminal Extenders on Equine Fertility¹

Colorado State University, Fort Collins 80523

Abstract

Pregnancy rate, spermatozoan motility and spermatozoan agglutination were significantly lower in an extender containing .349% Tris than in an extender utilizing 2.4% Tris. First-cycle pregnancy rates of 22.2 and 11.1% were obtained with 500 and 100 x 10⁶ motile spermatozoa in a 2.4% Tris extender, and a rate of 61.1% (P < .05) was obtained with 500 x 10⁶ motile spermatozoa in raw semen. After four cycles there was no significant difference in fertility obtained with 2.4% Tris and the raw semen when 500 x 10⁶ spermatozoa were utilized (72.2 vs 88.9%). First cycle pregnancy rates of 37.5, 75.0 and 75.0% were obtained in 1973 when mares were inseminated with 500 x 10⁶ motile spermatozoa extended in 2.4% Tris, and cream-gel extenders and with raw semen, respectively. After three cycles, mares on the Tris-seminal treatment had a pregnancy rate of 75.0%, which was lower (P < .05) than the 95.8 and 91.7% for the cream-gel and raw-seminal treatments, respectively. The presence of glycerol in the Tris extenders may have been at least partially responsible for the depression of fertility. Pregnancy rates of 75.0 and 91.7% were obtained after one and three cycles, respectively, with a mean insemination volume of 1.5 ml of raw semen. Thus, a large insemination volume may not be necessary for maximum fertility in the mare.

¹ Animal Reproduction Laboratory, Department of Physiology and Biophysics. Supported in part by grants-in-aid from American Breeders Service; National Association of Animal Breeders; and the Arabian Horse Registry of America, Inc., through Morris Animal Foundation. Portions of these data were presented at the Fifth N.A.A.B. Tech. Conf. A. I. Reprod., Chicago, IL, 1974, and the "First International Symposium Upon Equine Reproduction," Cambridge, England, 1974.

² Animal Reproduction Laboratory, Department of Physiology and Biophysics. Supported in part by grants-in-aid from American Breeders Service; National Association of Animal Breeders; and the Arabian Horse Registry of America, Inc., through Morris Animal Foundation. Portions of these data were presented at the Fifth N.A.A.B. Tech. Conf. A. I. Reprod., Chicago, IL, 1974, and the "First International Symposium Upon Equine Reproduction," Cambridge, England, 1974.

³ Department of Clinical Sciences.

⁴ Present address: Alberta Department of Agriculture, Animal Industry Division, Edmonton, Alberta, Canada.

⁵ Present address: Gleannloch Farms, Spring-Cypress Rd., Spring, TX 77393.