Abstract
ABSTRACTDeermice (Peromyscus maniculatus) were hormonally induced to ovulate and artificially inseminated with sperm of 13 other rodent species varying in taxonomic distinction from species to family level. These were compared with inter se and sham inseminated controls. Embryos were recovered at various stages from 5 h to 10 days. Hybrid embryos failed to develop fully in all crosses except those within the same species group. Closely allied interspecies group crosses produced implantation embryos, but intersubgeneric and intergeneric crosses did not develop beyond early cleavage. Interfamilial hybrid embryos could not be obtained.
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