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Effect of Anti-Semen Antibodies on Embryonic Survival in Rabbits¹

Agricultural Research Center, Beltsville, Maryland 20705

Abstract

TO determine the effect of anti-semen antibodies on embryo survival, 5-day and 9-day pregnant rabbits were given intrauterine injections of bovine anti-rabbit semen immune serum (heterologous IS) and rabbit and antirabbit semen immune serum (homologous IS). Three different heterologous IS were used. Injection of normal serum (NS), saline, or non-injected served as the control treatments.

Heterologous NS and IS and homologous IS caused a significant decrease in embryo survival when injected at 5 days. Only one of the heterologous IS caused a decrease in embryo survival when injected into the uteri of rabbits on day 9 of pregnancy. None of the other sera (heterologous NS, homologous NS or IS) caused a decrease, indicating that embryo survival is not affected by normal bovine serum at 9 days, but may be affected by a specific IS.

¹ R. M. Rollins and E. M. Garbina are gratefully acknowledged for their diligent technical assistance.

² Animal Physiology and Genetics Institute, A.R.S., United States Department of Agricutlure.