Variations in the Sexual Performance in Old Male Rats

老年雄鼠性行為表現之差異性

蔡元奮(Yuan-Feen Tsai) ； 蔡宏威(Houng-Wei Tsai) ； 戴美雲(Mei-Yun Tai)

《Zoological Studies》 33卷3期 (1994/07) Pp. 232-234

摘要

Progressively reduced copulatory behavior with age has been reported for male rats. In the present study, the sexual behavior of 197 old male rats (18-19 months) was investigated and four types of behavioral performance observed. Some subjects (16%) displayed the complete copulatory patterns, including mounts, intromissions, and ejaculations (Group A). Others (36%) exhibited mounts and intromissions but no ejaculation (Group B). Only 6% of the subjects exhibited mounts and did not show intromission or ejaculation (Group C). Most subjects (42%) did not exhibit any copulatory behavior (Group D). Comparisons of observed behavioral items among the four groups rendered significant differences (p ＜ 0.005). An exception to this was the first mount data of Groups Band C. These results suggest that at least four qualitatively different types of male sexual performance exist in old rats.

關鍵字

性行為 ； 雄鼠 ； 年齡

並列摘要

Progressively reduced copulatory behavior with age has been reported for male rats. In the present study, the sexual behavior of 197 old male rats (18-19 months) was investigated and four types of behavioral performance observed. Some subjects (16%) displayed the complete copulatory patterns, including mounts, intromissions, and ejaculations (Group A). Others (36%) exhibited mounts and intromissions but no ejaculation (Group B). Only 6% of the subjects exhibited mounts and did not show intromission or ejaculation (Group C). Most subjects (42%) did not exhibit any copulatory behavior (Group D). Comparisons of observed behavioral items among the four groups rendered significant differences (p ＜ 0.005). An exception to this was the first mount data of Groups Band C. These results suggest that at least four qualitatively different types of male sexual performance exist in old rats.

並列關鍵字

Sexual behavior ； Male rat ； Age