Maternal behavior deficits in nulliparous oxytocin knockout mice.

Area of Science:

• Neuroscience
• Behavioral Biology
• Endocrinology

Background:

• Previous studies on oxytocin knockout (OTKO) mice did not reveal maternal behavior deficits.
• The extent of detailed observation in prior studies remains unclear.

Purpose of the Study:

• To compare maternal behaviors between OTKO and wild-type (WT) nulliparous mice toward foster pups.
• To investigate the role of oxytocin (OT) in maternal care behaviors.

Main Methods:

• OTKO and WT nulliparous mice were tested with foster pups over three consecutive days.
• Maternal behaviors, including pup retrieval and licking, were observed and quantified over 3.5-hour sessions.

Main Results:

• OTKO females retrieved significantly fewer pups to a corner compared to WT females.
• OTKO females exhibited significantly lower pup-licking frequencies and a tendency for lower self-grooming.
• OTKO females predominantly mothered pups in the cage center, unlike most WT females.

Conclusions:

• Oxytocin (OT) significantly stimulates pup-licking in nulliparous mice, similar to lactating rats.
• OT may play a role in the motivation for retrieving pups to a secure location.