Characteristics of the menstrual cycle in nonhuman primates. II. Ovulation and optimal mating times in macaques.

An analysis of the results of 1,259 limited-duration matings was conducted on colonies of Macaca arctoides and M. fascicularis. Maximum conception occurred at a day of breeding/cycle length (DB/CL) ratio of 0.40--0.41 with a range of DB/CL ratios for successful matings from 0.39 to 0.44. These values are compared with published values for various endocrine parameters equated to cycle length.