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Assessment of Sexual Behavior of Male Mice
Published on: March 5, 2020
Behavioral characterization of non-copulating male mice
W Portillo1, E Antonio-Cabrera, F J Camacho
1Instituto de Neurobiología Universidad Nacional Autónoma de México, México. portillo@unam.mx
Hormones and Behavior
|May 16, 2013
Summary
Non-copulating (NC) male mice show reduced sexual motivation and olfactory interest in females. Their accessory olfactory system is less active, indicating a lack of sexual drive, not hormonal issues.
Area of Science:
- Neuroscience
- Animal Behavior
- Endocrinology
Background:
- Non-copulating (NC) males exhibit a lack of mating behavior despite opportunities.
- NC males have been observed across various species, including rodents.
Purpose of the Study:
- To behaviorally characterize NC male mice.
- To investigate their sexual incentive motivation, olfactory preferences, and accessory olfactory system (AOS) activity.
- To determine if hormonal treatments can induce sexual behavior in NC males.
Main Methods:
- Evaluated sexual incentive motivation and olfactory preferences in NC and copulating (C) male mice.
- Measured Fos-immunoreactivity (Fos-IR) in the AOS in response to estrous odors.
- Administered estradiol and dopamine treatments.
- Compared testis weight and penile spine counts.
Main Results:
- NC males showed no preference for female incentive zones and spent less time investigating female odors.
- No increase in Fos-IR was observed in the AOS of NC males exposed to estrous odors.
- Estradiol supplementation did not induce sexual behavior in NC males; testis weight and penile spine counts were normal.
Conclusions:
- NC male mice exhibit deficits in sexual motivation and olfactory responses to females.
- These deficits are not attributable to low gonadal hormone levels.
- NC males appear to lack sexual motivation towards receptive females and their odors.
