Early Postnatal Experience Modifies Activation of the Pituitary Testicular Complex in Male House Mice (Mus Musculus) Exposed to the Odor of Receptive Con- and Heterospecific Females.
Level 5 - mechanism / opinion, no new human data
Preclinical animal research with no human data
PubMed 37833586 · doi:10.1134/S0012496623700539
What was done
Male mice of two closely related species (Mus musculus wagneri and Mus spicilegus) were evaluated to assess how early postnatal experience and maternal rearing affect pituitary-testicular activation (serum free testosterone) upon exposure to odors of receptive conspecific or heterospecific females. M. m. wagneri males were reared either by conspecific mothers or cross-fostered by M. spicilegus mothers.
What was found
The abstract reports directional outcomes without providing numerical data: - Free testosterone was significantly lower in M. spicilegus than in M. m. wagneri. - Conspecifically reared M. m. wagneri males showed significantly lower free testosterone when exposed to heterospecific female odor compared to conspecific female odor. - Cross-fostering M. m. wagneri males with heterospecific females led to an overall decrease in testosterone response to female chemosignals and eliminated the difference in testosterone response between conspecific and heterospecific female odors.
Why it matters
This study demonstrates that early maternal environment and postnatal experience contribute to the physiological and endocrine mechanisms underlying precopulatory reproductive isolation between closely related rodent species.
Limits
The abstract reports no sample sizes, numerical hormone measurements, variability estimates, or exact p-values. As an animal model study, findings cannot be extrapolated beyond rodent reproductive biology.
Cited by
- supports Exposure to the odors of a receptive female causes a spike in testosterone levels in male animals.