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Influence of Progesterone-Estrogen Implants on Early Embryonic Mortality in Swine¹

Missouri Agricultural Experiment Station,² Columbia

Abstract

The reproductive performance of 132 gilts and sows was determined to evaluate the effects of exogenous progesterone and estrogen when administered as an implant on the rate of early embryonic mortality. The administration of 100 mg. progesterone caproate and 50 mcg. of estradiol benzoate per 100 lb. body weight on the 11th day after mating failed to induce a statistically significant improvement in embryonic survival, although a trend toward increased litter size was observed. In a second experiment the percentage of corpora lutea represented by living embryos was not increased in gilts and sows implanted with progesterone caproate and estradiol benzoate on the seventh day of pregnancy.

¹ Contribution from Missouri Agricultural Experiment Station Journal Series No. 2540. Approved by Director.

² The authors gratefully acknowledge the generosity of The Squibb Institute of Medical Research, New Brunswick, New Jersey, for supplying the hormones used in this study.