A COMPARATIVE STUDY 0N THE MAIE SEXUAL BEHAVIOR IN AND JAPANESE MONKEYS
Ⅺ0NG Chengpei, WANG Qishan
1991, 11(1):
13-22.
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The male sexual behavior of Thibetan and Japanese monkeys was studied. Study subjects were the Thibetan monkeys of Huangshan Yulingkeng troop(observed for a total of 807h.)and the Japanese monkeys of Shiga A1 troop (observed for a total of 178.2h.) The males or females of Thibetan and Japanese monkeys may solicit for copulation, In Thibetan monkeys, 82.4% of 539 sexual solicitations were perfromed by the males, while Japanese monkeys were observed to perfromed at a percentage freqency of 37.8% of 112 sexual solicitations. 448 complete copulations of Thibetan monkeys were recorded and they were single mount-to-ejaculators, duration of mounts averaged 23.2 sec. (4-67 sec.), and the ejaculation generally occured after 4-25 sec. (averaged 21.6 sec.), in which males averaged 20 pelvic thrusts(6-45 sec.), the rate of thrusting averaged 1.4/sec. In Japanese monkeys, 125 complete copulations were observed and they were multiple mount-to-ejaculators, duration of per mount averaged 2 sec. (0.5-9 sec.), which duration of ejaculatory sequencesn averaged 8.2min, (ranged 2-33 min), in which males mounts averaged 10.6 times(ranged 2-42), the rate of thrusting averaged 1.1/sec. (Table 1). In Thibetan monkeys, alpha was a main copulator in troop that occupied 70.9% of the copulations, while 2nd-, 3rd-male and low-ranking males(n=4) only occupied 22.5%, 3.5% and 3.1% respectively. However, low-ranking males(n=24) were main copulations in Japanese monkeys, they occupied 64% of the copulations, alpha and 2nd- male occupied 5.5%; and 3rd-, 4th- and 5th-male occupied 17%, 3%and 21% respectively(Table 2). Thibetan monkey's alpha, 2nd- and 3rd-male were more often to select mid- and old-aged females for their copulations, while low-ranking males tended to copulated with the pubescents. In Japanese monkeys, as a trend, the males were more often to copulate with old- and mid-aged females. (Table 3). Harassment from high-ranklng males may interrupt the copulation of low-ranking males，but the copulation of high-ranking males was rarely interrupted by harassment of low-ranking males in Thibetan monkeys．In Japanese monkeys，only 54.3 % of thecopulations of low-ranking males were interrupted by the harassment of high ranking males，and harassments from low-ranking males weren't observed.
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