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Nutritional status and behavior during lactation

H Pachón1, M K McGuire, K M Rasmussen

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

Physiology & Behavior
|August 1, 1995
PubMed
Summary
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Maternal food restriction impacts rat behavior, with restricted mothers showing more nursing at night. Mild restriction preserves daily activity patterns, while severe restriction reverses them.

Area of Science:

  • Reproductive Biology
  • Behavioral Neuroscience
  • Animal Models

Background:

  • Maternal care is crucial for pup development and survival.
  • Food availability can influence maternal behavior and physiology.
  • Circadian rhythms regulate daily patterns of behavior.

Purpose of the Study:

  • To investigate the effects of chronic maternal food restriction on maternal and pup behaviors.
  • To examine the influence of time of day (diurnal variation) on these behaviors.
  • To assess the impact of varying levels of food restriction on circadian patterns.

Main Methods:

  • Ovariectomized Sprague-Dawley rats were divided into ad libitum (AL), 85% ad libitum (85 AL), and 70% ad libitum (70 AL) feeding groups.
  • Maternal and pup behaviors were observed using a novel instrument during nocturnal and diurnal periods on specific lactation days.

Related Experiment Videos

  • Data were collected during 45-minute observation sessions.

    • Main Results:

    • Food-restricted dams (70 AL and 85 AL) exhibited increased nursing behaviors at night compared to ad libitum (AL) dams.
    • AL dams showed more nursing during the day than at night, while 70 AL dams displayed the opposite pattern.
    • 85 AL dams maintained similar activity levels during both day and night, indicating less pronounced circadian disruption.

    Conclusions:

    • Chronic maternal food restriction alters maternal and pup behaviors, particularly increasing nocturnal nursing.
    • Severe food restriction (70 AL) disrupts normal diurnal activity patterns, while mild restriction (85 AL) has a less pronounced effect.
    • Circadian rhythm alterations in maternal behavior are dose-dependent on the severity of food restriction.