IMMUNOLOGICAL STUDIES ON FERTILITY AND STERILITY

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Abstract
Rabbit embryos were treated at 1 or at 9 days of age with cattle immune sera produced against rabbit se-men and rabbit erythrocytes. Immune sera against semen did not produce a consistent effect on the survival rates of 1-day-old embryos, but did produce a significant increase in death rate among embryos that were treated at 9 days of age. No significant differences were observed in the survival rates of embryos treated at either stage of development with normal sera and immune sera produced against rabbit erythrocytes.