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Influence of Varying the Proportion of Uterus Occupied by Embryos on Maintenance of Pregnancy in the Pig¹

University of Illinois, Urbana²

Abstract

Ninety-seven gilts were used in two studies to investigate the effect of varying the proportion of uterus occupied by embryos on continuation of pregnancy. Embryos were restricted to specific portions of the uterus either by ligating the uterine horn at a certain point or by flushing embryos from one uterine horn and ligating at the uterine body.

A nongravid segment as long as one-sixth of the uterus did not interfere with continuation of pregnancy.Neither did a nongravid segment as long as one-third prevent pregnancy but the percent of gilts pregnant was reduced significantly (P<.05) from control levels in the first study but not in the second.Pregnancy was maintained in only one of 42 gilts with one-half or two-thirds of the uterus unoccupied.

¹ This study was supported in part by Public Health Service Research Grant HD 01987 from the National Institute of Child Health and Human Development.

² Department of Animal Science.