Abstract
Recent research in this laboratory has failed to replicate previous findings that the first ejaculatory series of the male is sufficient to induce a high incidence of pregnancy in female laboratory rats (Rattus norvegicus). The incidence of pregnancy and pseudopregnancy in albino and hooded females were compared in a standard experimental paradigm. Eight percent of Sprague-Dawley albino females exhibited a progestational response, while 45% of the Long-Evans hooded females became progestational. On the basis of these findings, and a lack of previous formal comparison of genetic strains, it is suggested that genetic differences among strains may be at least partially responsible for differences observed in the ability of a single ejaculatory series to impregnate female laboratory rats.
Published Version
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