Hoover J E, Drickamer L C
J Reprod Fertil. 1979 Mar;55(2):297-301. doi: 10.1530/jrf.0.0550297.
It was demonstrated that mice treated with urine from pregnant or lactating females experienced longer periods of oestrus than did mice treated with water or urine from singly caged females. Application of urine by means of perforated capsules placed in the cage of the test mouse showed that the factor(s) responsible for the longer periods of oestrus was an airborne pheromone. The females experiencing longer oestrous periods ovulated (ova in oviducts), became pregnant and gave birth.
结果表明，用怀孕或哺乳期雌性小鼠的尿液处理过的小鼠，其发情期比用单独饲养的雌性小鼠的尿液或水进行处理的小鼠更长。通过放置在实验小鼠笼中的穿孔胶囊施用尿液表明，导致发情期延长的因素是一种空气传播的信息素。发情期延长的雌性小鼠排卵（输卵管中有卵子）、怀孕并产仔。
