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Maternal behavior deficits in nulliparous oxytocin knockout mice.

C A Pedersen1, S V Vadlamudi, M L Boccia

  • 1Department of Psychiatry, The University of North Carolina at Chapel Hill. Chapel Hill, NC 27599-7160, USA. cort_pederson@med.unc.edu

Genes, Brain, and Behavior
|April 6, 2006
PubMed
Summary

Oxytocin knockout (OTKO) mice showed deficits in retrieving pups and reduced pup-licking. These findings suggest oxytocin (OT) is crucial for pup retrieval motivation and licking behaviors in new mothers.

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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.

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  • 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.