Prenatal stress alters maternal aggression in mice

Area of Science:

• Neuroscience
• Reproductive Biology
• Animal Behavior

Background:

• Prenatal stress is a known environmental factor impacting offspring development and behavior.
• Maternal aggression and parental care are crucial for offspring survival and well-being.

Purpose of the Study:

• To investigate the effects of prenatal stress (heat and restraint) on maternal behavior and reproductive outcomes in Rockland-Swiss (R-S) albino female mice.
• To examine the impact of prenatal stress on offspring growth and development.

Main Methods:

• Rockland-Swiss (R-S) albino female mice were subjected to prenatal stress (heat and restraint).
• Maternal aggression, nestbuilding behavior, and reproductive parameters were assessed.
• Offspring birth weights, body weight gain, and anogenital distances were measured.

Main Results:

• Prenatal stress reduced pregnancy-induced and elevated postpartum aggression in female mice.
• Nestbuilding was slightly reduced during early pregnancy, with a slight increase in male offspring.
• Offspring exhibited deficits in birth weights and body weight gain.
• Anogenital distances were shorter in prenatally-stressed females, suggesting altered fetal testosterone exposure.

Conclusions:

• Prenatal stress significantly impacts maternal aggression and reproductive success in mice.
• Offspring born to stressed mothers show impaired growth and development.
• Altered fetal testosterone exposure may underlie the observed behavioral and reproductive disruptions.