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Related Experiment Videos

Nutritional status, suckling behavior, and prolactin release during lactation

K J Schulze1, K M Rasmussen

  • 1Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853.

Physiology & Behavior
|November 1, 1993
PubMed
Summary

Food restriction impacts prolactin (PRL) release in lactating rats. Suckling intensity influences PRL levels, particularly in early lactation, but dam behavior also plays a role.

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Area of Science:

  • Reproductive Endocrinology
  • Lactation Physiology
  • Nutritional Neuroscience

Background:

  • Chronic food restriction (CR) affects maternal physiology during lactation.
  • Prolactin (PRL) is crucial for milk production and maternal behavior.
  • Understanding PRL regulation is key to maternal health and offspring development.

Purpose of the Study:

  • To investigate if reduced suckling vigor in food-restricted rats causes lower prolactin (PRL) levels.
  • To examine the influence of dietary treatment and litter type on PRL release.
  • To determine how lactation stage affects PRL regulation in response to suckling.

Main Methods:

  • Rats were fed ad lib (AL) or chronically restricted (CR) to 50% of AL intake.
  • Lactating rats nursed their own or a cross-fostered litter for 90-minute periods.

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  • Blood samples were collected via catheter at early and peak lactation.

    • Main Results:

    • An interaction between dietary treatment and litter type affected PRL in early lactation.
    • No significant differences in PRL were found when comparing own vs. other litters within AL or CR groups.
    • CR dams' inattentive behavior may have attenuated their PRL response; peak lactation PRL was influenced by catheter recovery time.

    Conclusions:

    • Suckling contributes to PRL differences between AL and CR dams in early lactation.
    • Maternal behavior, not just suckling, modulates PRL release in food-restricted dams.
    • The regulation of prolactin release changes throughout lactation.