ADOLESCENCE OF MACAQUES1

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Abstract
Studies were made of 7 [female] monkeys (Macacus rhesus), with the following conclusions. The vaginal smear technic in correlation with rectal palpation and controlled mating is of value in determining the time of ovulation. Menarche occurs at an avg. wt. of 3400 g. The length of the cycle is irregular (30.6 [plus or minus] 11.8 days). The frequent anovulatory cycles are probably due to insufficient luteinization of the developed follicle. The sterile period ranges from a month to a yr. Spontaneous abortion occurs readily in adolescent monkeys conceiving at the time of initial ovulation.