Eguibar Jose R, Cortes Carmen, Toriz Cesar G, Romero-Carbente Jose C, González-Flores Oscar, Fernández-Guasti Alonso
Benemerita Universidad Autonoma de Puebla, Research Office of the Vice-rectory of Research and Postgraduate Studies, Puebla, Pue. C.P. 72000, Mexico.
Institute of Physiology, Puebla, Pue. C.P. 7257072000, Mexico.
Physiol Behav. 2016 Jan 1;153:84-90. doi: 10.1016/j.physbeh.2015.10.030. Epub 2015 Oct 29.
The temporal organization of masculine sexual behavior in rats is highly stereotyped; involving a sequence of mounts, intromissions and ejaculations. Sexual behavior has been described in exogamic and genetically manipulated rodent species. In this work, we compare the male sexual behavior of outbred Sprague-Dawley (SD) to those of rats inbred for high (HY)- and low (LY)- spontaneous yawning frequency. In the first experiment, the percentage of inexperienced rats' ejaculatory behavior is significantly lower in the HY and LY respect to Sprague-Dawley rats. The latency to ejaculate for inexperienced HY was shorter than the LY and SD rats. In the second experiment, we examined the differences between inbred sublines and Sprague-Dawley rats once the subjects had become sexually experienced after four copulatory sessions. HY rats still have slower proportion of ejaculators respect to LY and SD rats. Additionally, postejaculatory latencies were longer for HY rats, with longer intercopulatory intervals and higher number of copulatory bouts that delayed ejaculation. Both sublines show lower copulatory efficiency respect to SD rats. In conclusion, both sublines show alterations in the temporal organization of sexual motor pattern that are due at least partially to strong inbreeding process to select them.
大鼠雄性性行为的时间组织具有高度刻板性；包括一系列的爬跨、插入和射精行为。在远交和基因操纵的啮齿动物物种中都对性行为进行过描述。在这项研究中，我们比较了远交的斯普拉格-道利（SD）大鼠与高（HY）-和低（LY）-自发打哈欠频率的近交系大鼠的雄性性行为。在第一个实验中，与斯普拉格-道利大鼠相比，HY和LY品系中无经验大鼠的射精行为百分比显著更低。无经验的HY大鼠射精潜伏期比LY和SD大鼠短。在第二个实验中，我们在实验对象经过四次交配变得有性经验后，研究了近交亚系与斯普拉格-道利大鼠之间的差异。与LY和SD大鼠相比，HY大鼠射精者的比例仍然较低。此外，HY大鼠射精后的潜伏期更长，交配间隔更长，延迟射精的交配回合数更多。两个亚系的交配效率均低于SD大鼠。总之，两个亚系在性运动模式的时间组织上都表现出改变，这至少部分归因于为选择它们而进行的强烈近亲繁殖过程。
