Females reach puberty around age three while males are sexually mature by age four.The ovarian cycle lasts for 28 days and is characterized by the darkening of the skin surrounding the anogenital region accompanied by menstruation (Catchpole & van Wagenen 1975). Estrus lasts for eight to 12 days, with the day of ovulation occurring at the midpoint of the estrus period.Females have increased sexual activity during ovulation, exhibiting the highest number of copulations seen during the ovarian cycle