Reproduction in Western Forms of the Spotted Skunk (Genus Spilogale)

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Abstract
The reproductive cycle of four western forms of Spilogale is de¬scribed and compared with that of eastern forms of the genus. Most adult males possess spermatozoa in their testes and epididymides by June. Some juvenile males attain sexual maturity by September. Copulation occurs in September, at which time both juvenile and adult females are bred. The zygote undergoes cleavage to form a blastula in a normal manner. Further development of the blastocyst is greatly retarded and the embryos float freely in the uterine lumen for approximately 180 to 200 days. Nidation occurs in April. Most litters are born in May after a gestation period of 210 to 230 days. The physiological, cytological, and morphological data presented suggest that the two (eastern and western) populations of Spilogale are distinct species.

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