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[Postileal nutrient digestibility in cattle].

J Bartelt1, K P Götz, H Bergner

  • 1Fakultät für Landwirtschaft und Gartenbau, Humboldt-Universität zu Berlin, Institut für Ernährungsphysiologie.

Archiv Fur Tierernahrung
|August 1, 1991
PubMed
Summary

This study measured nutrient and water losses in cattle colons, finding significant losses in crude fiber, NDF, ADF, hemicellulose, crude protein, and dry matter. These findings are crucial for understanding cattle digestive efficiency.

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Area of Science:

  • Animal Nutrition
  • Digestive Physiology
  • Ruminant Metabolism

Background:

  • Understanding nutrient utilization and losses in the bovine colon is essential for optimizing animal diets and feed efficiency.
  • The ileocecal junction plays a critical role in regulating digesta flow and nutrient absorption before fecal excretion.

Purpose of the Study:

  • To quantify nutrient and water losses occurring in the colon of cattle fed hay-based rations.
  • To determine the digestibility of various feed components within the colon.

Main Methods:

  • Ileocecal re-entrant cannulation in four heifers to collect digesta quantitatively over 24 hours.
  • Analysis of digesta and fecal samples to calculate nutrient and water losses.
  • Rations included hay, wheat meal, molasses, urea, and minerals.

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Main Results:

  • No significant differences in nutrient losses were observed between two hay variants.
  • Average colonic losses (digestibility) were: crude fiber 10.6%, NDF 10.4%, ADF 11.9%, hemicellulose 7.4%.
  • Apparent digestibility losses included: crude protein 12.1%, crude fat 10.7%, N-free extracts 18.9%, ash 31.2%, dry matter 17.5%.
  • 8.2 liters of water were excreted in feces out of 23.4 liters supplied in ileal digesta.

Conclusions:

  • The bovine colon significantly contributes to the loss of various nutrients and water.
  • Specific nutrient losses in the colon, such as crude fiber and N-free extracts, are substantial and need consideration in feed evaluation.
  • These findings highlight the importance of colonic function in overall nutrient metabolism and water balance in cattle.