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Stage of Gestation when Uterine Capacity Limits Embryo Survival in Gilts¹

North Carolina State University, Raleigh 27607

Abstract

Three trials were conducted to define the stage of gestation at which uterine capacity acts to reduce 25-day litter size of gilts. This was done by superinduction, i.e., increasing the number of potential embryos by transferring additional embryos to the uterus of a pregnant recipient. It was assumed that superinduction would significantly increase litter size if it was performed after the stage of gestation in which mechanisms that control uterine capacity are operative.

In two out of three trials, superinduction on Day 7 (onset of estrus Day 0) did not significantly increase 25-day litter size. This indicates that mechanisms which control uterine capacity are operating after Day 7 to reduce litter size to a level characteristic of the gilt uterus. A summary of Day 7 superinduction treatments in all trials demonstrates that 14.9 total embryos and 12.3 live embryos represent the average levels of uterine capacity characteristic of gilts sampled in this experiment.

¹ Contribution from the Animal Science Department and supported in part by Public Health Services Research Grant HD02923. National Institute of Child Health and Human Development. Paper No. 3550 of the Journal series of the North Carolina State University Agricultural Experiment Station, Raleigh. Computing services for this investigation were supported by Public Health Service Grant FR-00011. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of the products named, nor criticism of similar ones not mentioned.

² Present address: Universidad Central de Venezuela, Facultad de Agronomia. Institute de Produccion Animal, Maracay.

³ Present address: Department of Animal Science, University of Florida, Gainesville.

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