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F. H. BRONSON, B. E. ELEFTHERIOU and E. I. GARICK

Summary.

Inseminated deermice (Peromyscus maniculatus bairdii) were exposed for 24 hr to strange male or female (1) P. m. bairdii; (2) P. m. gracilis (an inter-fertile subspecies); or (3) C57BL/10J house mice (members of a different family of rodents). Implantation was significantly affected except in the case of exposure to bairdii or C57BL/10J females. Exposure to male bairdii and male gracilis caused the highest incidence of blocked pregnancies. Differences between the sexes in producing implantation failures in inseminated bairdii were marked in bairdii and negligible in gracilis and C57BL/10J mice.