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The Postpartum Interval and its Relation to Fertility in the Cow, Sow and Ewe

University of Wisconsin,¹ Madison 53706

Abstract

THE postpartum interval is considered as the interval beginning with parturition and ending with a designated event. This event may be the first ovulation, the first estrus, the completion of uterine involution, the first breeding, or conception. Rather than implying an interval of status quo, there usually is the implication of a series of changes during the interval.

A relationship exists between the postpartum interval and the breeding season. The calendar year in the life of a breeding female is comprised of the total time in gestation in its broadest sense (intervals from insemination to parturition) plus the total time in seasonal anestrus plus total time in intervals of postpartum adjustment returning to the potentially fertile state. The seasonal anestrus and the postpartum interval may be telescoped together until it is unclear which is the cause of infertility.

Let us consider patterns of breeding seasons, assuming that in the wild, all animals have a breeding season.

¹ Laboratory of Genetics.