Squirrel monkey reproduction: the "fatted" male phenomenon and seasonal spermatogenesis.
Records of reproduction in a Miami colony of squirrel monkeys living in a seminatural state and of monkeys in the field indicate that the male undergoes an annual testis cycle. The spermatogenic phase is associated with the seasonal acquisition of a secondary sexual characteristic which we have termed the "fatted" condition. Body weights, measurements of subcutaneous fat, and testicular histology studied over a 12-month period further establish this cycle. Climatological analyses suggest that this cycle is associated with the precipitation cycles of the respective environments.
D000818:Animals; D002980:Climate; D000882:Haplorhini / Q000502:physiology*; D008297:Male; D012098:Reproduction; D012621:Seasons; D013094:Spermatozoa; D013737:Testis / Q000033:anatomy & histology / Q000502:physiology*