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Updated: Aug 14, 2026
Assessment of Sexual Behavior of Male Mice
Published on: March 5, 2020
Adrenal modulation of parental behavior in neonatally gonadectomized C57BL/6J male mice
Abstract:
C57BL/6J male mice ordinarily kill neonatal mouse pups even if they are rendered androgen deficient by neonatal castration. Experiment 1 showed that adrenalectomy during adult life significantly decreased the tendency of neonatally gonadectomized males to kill newborns. Experiment 2 demonstrated that testosterone exposure (via silastic implants) during adult life prevented the effects of adrenalectomy in that killing was elevated and retrieving was reduced in neonatally gonadectomized males. Adrenal androgens may be responsible for maintaining killing behavior in neonatally castrated C57BL/6J male mice.
Insights
Even after castration, male mice often kill pups. Adrenal androgens, not just testicular androgens, appear to maintain this killing behavior in C57BL/6J mice.
Area of Science:
- Behavioral Endocrinology
- Neuroscience
- Animal Behavior
Background:
- Male C57BL/6J mice exhibit pup-killing behavior, even when androgen-deficient due to neonatal castration.
- This suggests a potential role for non-gonadal androgens in maintaining this behavior.
Purpose of the Study:
- To investigate the role of adrenal androgens in maintaining pup-killing behavior in neonatally castrated male mice.
- To determine if testosterone replacement affects this behavior and the influence of adrenalectomy.
Main Methods:
- Neonatal castration was performed on male C57BL/6J mice.
- Adult adrenalectomy was conducted in a subset of castrated mice.
- Testosterone replacement therapy using silastic implants was administered to some mice.
Main Results:
- Adrenalectomy significantly reduced pup-killing behavior in neonatally castrated males.
- Testosterone replacement in neonatally castrated males counteracted the effects of adrenalectomy, increasing killing and decreasing retrieving.
- These findings indicate adrenal androgens contribute to the maintenance of killing behavior.
Conclusions:
- Adrenal androgens play a crucial role in maintaining pup-killing behavior in neonatally castrated male C57BL/6J mice.
- Testosterone from the testes is not the sole determinant of this behavior; adrenal hormones are significant.
- Further research into adrenal androgen pathways could offer insights into aggression and related behaviors.
