Cohabitation between male rats after ejaculation: effects on conditioned partner preference

Area of Science:

• Behavioral Neuroscience
• Animal Behavior
• Neuroendocrinology

Background:

• Male rats develop sexual partner preference for females associated with the postejaculatory interval (PEI).
• This suggests exposure to a partner during the PEI is crucial for developing conditioned sexual preference.

Purpose of the Study:

• To investigate if cohabitation between two males during the PEI leads to same-sex partner preference.
• To understand the role of the PEI in social and sexual preference development in male rats.

Main Methods:

• Male rats copulated with a female, then cohabited with a scented male conspecific during the PEI (experimental group) or 7 hours later (control group).
• This conditioning was repeated for ten trials, with partner preference tested on trial 11 using a familiar scented male and an unfamiliar unscented male.

Main Results:

• Males in the PEI group did not develop a preference for the familiar scented male.
• PEI group males interacted less with the familiar male and displayed more agonistic behaviors towards him compared to the unscented male.

Conclusions:

• Cohabitation during the PEI does not induce conditioned same-sex partner preference in male rats.
• Findings suggest potential implications for conditioned hostility in intrasexual competition and highlight the specificity of PEI conditioning for opposite-sex partners.