Abstract
The subjects consisted of adult male rhesus macaques (N = 22) that had been born and reared in the laboratory and had failed to ejaculate in standardized tests of sexual behavior in adulthood. As infants they had been given regular but limited social experience, and as juveniles and adults they had been housed in individual cages. Saphenous vein blood (3 ml) was taken on each of 5 days; the plasma was removed and stored for later assay for testosterone (T) and dihydrotestosterone (DHT). The males were then released into a 1-acre outdoor enclosure with 8—14 adult females. Behavior was observed daily for 2 hr, and blood was taken from the males once a week for hormone assays. During the first 8 weeks, four males ejaculated, and they were removed from the enclosure. During the second 8 weeks, four additional males ejaculated, and they were also removed from the enclosure. The remaining 14 males were never observed to achieve intromission or to ejaculate during the 28 weeks in the enclosure, but 11 masturbated to ejaculation. There was no evidence that individuals with high plasma T levels were more sexually active or more dominant than males with lower T levels. Mean levels of plasma T were within the range observed in wild-born rhesus males, but the level of sexual performance was not. At the end of the 12th week, all of the females initially in the enclosure were removed and 13 different adult females were introduced. Three females became pregnant.
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References
Eaton, G. G. (1978). Longitudinal studies of sexual behavior in the Oregon troop of Japanese macaques. In McGill, T. E., Dewsbury, D. A., and Sachs, B. D. (eds.),Sex and Behavior: Status and Prospectus Plenum Press, New York, pp. 35–59.
Fox, C. A., Ismail, A. A. A., Love, D. N., Kirkham, K. E., and Loraine, J. A. (1972). Studies on the relationship between plasma testosterone levels and human sexual activity.J. Endocrinol. 52: 51–58.
Gerall, H. D., Ward, I. L., and Gerall, A. A. (1967). Disruption of the male rat's sexual behaviour induced by social isolation.Anim. Behav. 15: 54–58.
Goldfoot, D. A. (1977a). Rearing conditions which support or inhibit later sexual potential for laboratory-born rhesus monkeys: Hypotheses and diagnostic behaviors.Lab. Anim. Sci. 27: 548–556.
Goldfoot, D. A. (1977b). Sociosexual behaviors of nonhuman primates during development and maturity: Social and hormonal relationship. In Schrier, A. M. (ed.),Behavioral Primatology Advances in Research and Theory, Vol. 1, Lawrence Erlbaum, Hillsdale, N.J., pp. 139–184.
Gordon, T. P., Rose, R. M., and Bernstein, I. S. (1976). Seasonal rhythm in plasma testosterone levels in the rhesus monkey (Macaca mulatta): A three year study.Horm. Behav. 7: 229–243.
Gordon, T. P., Bernstein, I. S., and Rose, R. M. (1978). Social and seasonal influences on testosterone secretion in the male rhesus monkey.Physiol. Behav. 21: 623–627.
Goy, R. W., and Goldfoot, D. A. (1974). Experiential and hormonal factors influencing development of sexual behavior in the male rhesus monkey. In Schmitt, F. O., and Worden, F. G. (eds.),The Neurosciences: Third Study Program, Vol. 3, MIT Press, Cambridge, Mass., pp. 571–581.
Goy, R. W., Wallen, K., and Goldfoot, D. A. (1974). Social factors affecting the development of mounting behavior in male rhesus monkeys. In Montagna, W., and Sadler, W. A. (eds.),Reproductive Behavior Plenum Press, New York, pp. 223–247.
Hanby, J. P., Robertson, L. T., and Phoenix, C. H. (1971). The sexual behavior of a confined troop of Japanese macaques.Folia Primatol. 16: 123–143.
Harlow, H. F. (1965). Sexual behavior in the rhesus monkey. In Beach, F. A. (ed.),Sex and Behavior Wiley, New York, pp. 234–265.
Mason, W. A. (1960). The effects of social restriction on the behavior of rhesus monkeys. 1. Free social behavior.J. Comp. Physiol. Psychol. 53: 582–589.
Michael, R. P., and Keverne, E. B. (1971). An annual rhythm in the sexual activity of the male rhesus monkey,Macaca mulatta, in the laboratory.J. Reprod. Fertil. 25: 95–98.
Missakian, E. A. (1969). Reproductive behavior of socially deprived adult male rhesus monkeys (Macaca Mulatta).J. Comp. Physiol. Psychol. 69: 403–407.
Missakian, E. A. (1972). Effects of adult social experience on patterns of reproductive activity of socially deprived male rhesus monkeys (Macaca mulatta).J. Pers. Soc. Psychol. 21: 131–134.
Modahl, K. B., and Eaton, G. G. (1977). Display behaviour in a confined troop of Japanese macaques.Anim. Behav. 25: 525–535.
Phoenix, C. H. (1974). Effects of dihydrotestosterone on sexual behavior of castrated male rhesus monkeys.Physiol. Behav. 12: 1045–1055.
Phoenix, C. H. (1978a). Steroids and sexual behavior in castrated male rhesus monkeys.Horm. Behav. 10: 1–9.
Phoenix, C. H. (1978b). Sexual behavior of laboratory- and wild-born male rhesus monkeys.Horm. Behav. 10: 178–192.
Phoenix, C. H., Dixson, A. F., and Resko, J. A. (1977). Effects of ejaculation on levels of testosterone, cortisol and luteinizing hormone in peripheral plasma of rhesus monkeys.J. Comp. Physiol. Psychol. 91: 120–127.
Plant, T. M., Zumpe, D., Sauls, M., and Michael, R. P. (1974). Annual rhythm in plasma testosterone of adult male rhesus monkeys maintained in laboratory.J. Endocrinol. 62: 403–404.
Resko, J. A., Malley, A., Begley, D., and Hess, D. L. (1973). Radioimmunoassay of testosterone during fetal development of the rhesus monkey.Endocrinology 93: 156–161.
Robinson, J. A., Scheffler, G., Eisele, S. G., and Goy, R. W. (1975). Testosterone and dihydrotestosterone concentrations of laboratory-housed male rhesus monkeys (Macaca mulatta).Biol. Reprod. 13: 203–210.
Rose, R. M., Gordon, T. P., and Bernstein, I. S. (1972). Plasma testosterone levels in the male rhesus: Influences of sexual and social stimuli.Science 178: 643–645.
Rose, R. M., Bernstein, I. S., and Gordon, T. P. (1974). Consequences of social conflict on plasma testosterone levels in rhesus monkeys.Psychosom. Med. 37: 50–61.
Van Horn, R. N., Beamer, N. B., and Dixson, A. F. (1976). Diurnal variations of plasma testosterone in two prosimian primatesGalago crassicaudatus crassicaudatus andLemur catta.Biol. Reprod. 15: 523–528.
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This study is publication No. 1068 of the Oregon Regional Primate Research Center. This study was supported in part by Grant RR-00163 and HD-05969 from the National Institutes of Health, U.S. Public Health Service.
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Phoenix, C.H. Copulation, dominance, and plasma androgen levels in adult rhesus males born and reared in the laboratory. Arch Sex Behav 9, 149–167 (1980). https://doi.org/10.1007/BF01542266
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DOI: https://doi.org/10.1007/BF01542266