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Selective breeding for infant vocal response: a role for postnatal maternal effects?

S A Brunelli1, M A Hofer, A Weller

  • 1Department of Psychiatry, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA. sab9@columbia

Developmental Psychobiology
|April 25, 2001
PubMed
Summary
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Maternal care after birth does not influence ultrasonic vocalization (USV) rates in NIH rats. Cross-fostering experiments showed no significant changes in USV, indicating other factors may be involved.

Area of Science:

  • Behavioral Neuroscience
  • Developmental Biology
  • Animal Models

Background:

  • NIH rats were selectively bred for high or low ultrasonic vocalization (USV) rates in response to isolation at 10 days of age.
  • Understanding generational trait transmission is crucial for developmental and behavioral studies.

Purpose of the Study:

  • To investigate the role of postnatal maternal effects on the transmission of divergent ultrasonic vocalization (USV) traits in selectively bred rat lines.
  • To determine if maternal care influences the development of high or low USV phenotypes.

Main Methods:

  • Cross-fostering of pups between High-USV and Low-USV rat lines shortly after birth.
  • Comparison of USV rates in cross-fostered pups versus in-fostered (control) pups within each line.
  • Measurement of pup weight on the day of testing.

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Main Results:

  • Cross-fostered pups in both High-USV and Low-USV lines exhibited USV rates not significantly different from in-fostered controls.
  • High-USV line pups cross-fostered to Low-USV dams showed significantly lower body weight compared to in-fostered pups.
  • No evidence found for postnatal maternal contribution to the USV phenotype.

Conclusions:

  • Postnatal maternal care does not appear to be a significant factor in the generational transmission of ultrasonic vocalization (USV) rates in these rat lines.
  • Prenatal and/or perinatal maternal influences on the USV phenotype remain possibilities that warrant further investigation.