PMID: 558230Apr 1, 1977Paper

Maternal age and male behavior in relation to successful reproduction by female rats (Rattus norvegicus)

Journal of Comparative and Physiological Psychology
H N DavisD A Dewsbury

Abstract

This research demonstrated that multiple ejaculatory series may be critically important for successful reproduction by multiparous old females near the end of their active reproductive lives. Multiple series were essential for successful pregnancy, apparently because more than one series was necessary to induce functional luteal activity. Thus, (a) females receiving just one series failed to show the cessation of regular estrous cycles which characteristically follows induction of a functional luteal phase; (b) direct measurement of plasma progestins by radioimmunoassay revealed that only those females receiving more than one series had circulating levels significantly higher than unmated, normally cycling controls; and (c) administration of exogenous progesterone increased significantly the incidence of successful pregnancy among females allowed to mate through only one series. In addition to facilitating the occurrence of pregnancy, multiple series also increased both the number of eggs released at ovulation and the number of embryos present and developing 12 days later. It is concluded that multiple series may function as a behavioral mechanism for prolonging the female's active reproductive life.

Citations

Aug 1, 1979·Physiology & Behavior·S E HendricksG L Oswalt
Apr 1, 1980·Physiology & Behavior·D J Baumgardner, D A Dewsbury
Nov 1, 1981·Physiology & Behavior·C A Bean, D Q Estep
Jul 1, 1984·Physiology & Behavior·M K Matthews, R Kenyon
Jan 1, 1986·Physiology & Behavior·D Austin, D A Dewsbury
Nov 1, 1990·Physiology & Behavior·C Hedricks, M K McClintock
Aug 1, 1979·Hormones and Behavior·D A DewsburyD G Webster
Dec 28, 1981·Brain Research·A Castro-Vasquez, N B Carreno
Jan 1, 1990·Neuroscience and Biobehavioral Reviews·D A Dewsbury

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