Sexual behavior in aging male rhesus macaques: Effects of test duration on sexual performance |
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Authors: | Charles H Phoenix Kathleen C Chambers |
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Institution: | (1) Department of Primate Behavior, Oregon Regional Primate Research Center, 97007 Beaverton, Oregon, USA |
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Abstract: | The sexual behavior displayed by nine old (20-year and older) rhesus (Macaca mulatta) males in 10-min tests was compared to that displayed in 1-hr tests. The tests were part of a long-term study on the decline
in male sexual activity that accompanies old age. The males were paired with 10 ovariectomized, estrogentreated females in
two blocks of 10 tests; each male was tested once with each female in each test block. The percentages of males that achieved
intromissions and ejaculated in the two test blocks were the same (P < 0.05). Although the percentage of tests in which males
displayed these behaviors was higher in the longer-test block (P > 0.05), there was a significant positive correlation of
performance in 10-min tests with performance in 1-hr tests. Assuming a random distribution of contacting, mounting, intromission,
and ejaculation throughout the hour, we would have predicted a significantly lower number of these behaviors in the first
10 min of the 1-hr tests than we actually observed. The mean percentages of 1-hr tests with contacting, mounting, intromission,
and ejaculation was significantly lower than that of 10-min tests conducted with the same males 11 years earlier. Thus, the
decline in sexual performance was not an artifact of the limited (10-min) test duration. |
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Keywords: | Macaca mulatta male rhesus sexual behavior old age test duration |
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