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A Novel Automated System Yields Reproducible Temporal Feeding Patterns in Laboratory Rodents.

Thomas W Tilston1, Richard D Brown1, Matthew J Wateridge1

  • 1Neuroscience and Mental Health Research Institute and School of Biosciences, Cardiff University, Cardiff, United Kingdom.

The Journal of Nutrition
|July 10, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method for controlling rodent feeding patterns, enabling precise temporal feeding studies. This technique accurately delivers food in grazing or meal patterns, crucial for understanding nutritional science impacts.

Keywords:
automated blood samplingautomated feedingcorticosterone profilesfeeding patternsghrelingrazingmeal microstructuremeal-feeding

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Area of Science:

  • Nutritional science
  • Rodent models
  • Physiology

Background:

  • Temporal feeding patterns are critical in nutrition but difficult to study in rodents due to food hoarding.
  • Lack of reliable methods hinders research on the physiological impact of feeding timing.

Purpose of the Study:

  • To develop and validate a reliable method for imposing controlled temporal feeding patterns in rodents.
  • To enable prolonged studies on the effects of specific feeding schedules.

Main Methods:

  • An experimental feeding station was programmed to deliver standard or high-fat diets in nocturnal grazing or meal-feeding patterns.
  • Studies were conducted on male Sprague-Dawley rats and C57/Bl6J wild-type (WT) and ghrelin-null (Ghr-/-) mice.
  • Feeding patterns were precisely controlled to deliver specific amounts of food at set intervals or during defined periods.

Main Results:

  • The method achieved accurate and consistent feeding events in rats for both grazing and meal-feeding patterns.
  • High-fat diet (HFD) consumption led to increased meal size in rats over time.
  • While grazing induced hyperphagia in WT mice, this was not observed in Ghr-/- mice, indicating a role for ghrelin.
  • Neither feeding pattern elevated corticosterone in rats, but meal-feeding synchronized ultradian pulses.

Conclusions:

  • A consistent, measurable, and stress-free method for imposing temporal feeding patterns in rodents has been established.
  • This new approach facilitates research into the physiological effects of feeding timing.
  • The findings pave the way for deeper understanding of how meal timing influences health and metabolism.