silent mutation

T here are more volatile constituents in the urine of sexually active males th an in sexually inactive ones and more in breeding season than in non-breeding season.

结果发现 ,繁殖期雄体尿液中主要包含大约 2 9种挥发性物质 ,性活跃雄性个体的尿液中保留时间短的成分较性不活跃的多 ,2只性活跃雄体与 1只雌体尿液中挥发性成分除 2种成分不同外 ,其余基本一致 ;非繁殖期保留时间短的成分较繁殖期明显减少 。