Differential organization of male copulatory patterns in high- and low-yawning-frequency sublines versus outbred Sprague–Dawley rats

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 outbre...

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Published in:Physiology & behavior Vol. 153; pp. 84 - 90
Main Authors: Eguibar, Jose R., Cortes, Carmen, Toriz, Cesar G., Romero-Carbente, Jose C., González-Flores, Oscar, Fernández-Guasti, Alonso
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01.01.2016
Subjects:
Animals
Animals, Outbred Strains
Anxiety
Copulation - physiology
Dopamine
ejaculation
Ejaculation - genetics
Female
Grooming
inbreeding
Male
males
Maternal
Penile erection
Psychiatry
Rats
Rats, Inbred Strains
Rats, Sprague-Dawley
sexual behavior
Strain
Stress
Yawning - genetics
Maternal
Grooming
Dopamine
Penile erection
Anxiety
Stress
Strain
ISSN:0031-9384, 1873-507X, 1873-507X
Online Access:Get full text
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Summary: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 •The learning rate for male sexual behavior is slower in the high-yawning rats.•Inbreeding affects sexual performance in high-yawning rats.•The percentage of non-copulators and sluggish rats is higher in high-yawning rats.•High-yawning rats are less motivated to copulate.•High-yawning rats had more penile erections but a deficient copulatory display.
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ISSN:0031-9384
1873-507X
1873-507X
DOI:10.1016/j.physbeh.2015.10.030