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Nutrient metabolism by gut tissues

R Britton1, C Krehbiel

  • 1Department of Animal Science, University of Nebraska, Lincoln 68583-0908.

Journal of Dairy Science
|July 1, 1993
PubMed
Summary
This summary is machine-generated.

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Ruminant gut tissues, including the rumen, small intestine, cecum, and colon, utilize various metabolites for energy. Understanding these nutrient needs is crucial for assessing animal health and optimizing production.

Area of Science:

  • Animal Nutrition
  • Gastroenterology
  • Metabolic Physiology

Background:

  • The gastrointestinal tract, particularly in ruminants, demands significant energy (25% of total oxygen consumption) despite its relatively small body mass (6%).
  • Accurate assessment of nutrient requirements for gut tissues necessitates a thorough understanding of their specific metabolic fuel utilization.

Purpose of the Study:

  • To investigate the differential utilization of various metabolites (volatile fatty acids, glucose, glutamine, ketones) by distinct segments of the ruminant gut for energy production.
  • To provide insights into the specific metabolic preferences of rumen, small intestine, cecal, and colonic tissues.

Main Methods:

  • Review of net portal absorption data from existing studies.
  • Analysis of metabolite utilization patterns across different gut tissues.

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Main Results:

  • Rumen epithelial tissue utilizes acetate, propionate, and butyrate at 30%, 50%, and 90% of production, respectively, and also consumes glucose, with glutamine being a poor energy substrate.
  • Small intestinal tissue primarily uses glutamine, glucose, and ketones, with limited VFA utilization.
  • Cecal and colonic tissues efficiently use glucose and glutamine, with butyrate being the preferred energy substrate.

Conclusions:

  • Distinct gut segments exhibit specialized metabolic fuel preferences, highlighting the complexity of ruminant energy metabolism.
  • Understanding tissue-specific metabolite utilization is essential for formulating precise nutritional strategies in ruminant production systems.