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Related Experiment Video

Updated: Jun 5, 2026

Catheterization of Intestinal Loops in Ruminants
17:15

Catheterization of Intestinal Loops in Ruminants

Published on: June 11, 2009

Catheterization of intestinal loops in ruminants does not adversely affect loop function.

G Douglas Inglis1, John P Kastelic, Richard R E Uwiera

  • 1Agriculture and Agri-Food Canada, Lethbridge, Canada. Douglas.Inglis@agr.gc.ca

Comparative Medicine
|January 26, 2011
PubMed
Summary

Catheterized intestinal loops in sheep are a safe and effective model for studying host responses. This method allows for bacterial introduction and assessment of treatments without harming animal health or intestinal function.

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Area of Science:

  • Veterinary Medicine
  • Ruminant Physiology
  • Gastrointestinal Research

Background:

  • Catheterized intestinal loops are proposed as a model for studying host responses in ruminant small intestines.
  • Previous research has not fully established the impact of this technique on animal health and intestinal function.

Purpose of the Study:

  • To evaluate the safety and efficacy of catheterized ileal loops in sheep.
  • To determine if bacterial treatments can be introduced and if antibiotics can sterilize the loops.
  • To assess the impact on animal health, intestinal function, and microbiota composition.

Main Methods:

  • Sheep underwent ileal loop catheterization.
  • GFP-expressing Escherichia coli were introduced into the loops.
  • Tissue integrity and electrical resistance were measured.
  • Expression of key cytokine and nitric oxide synthase genes was analyzed.
  • Antibiotic effects on loop sterilization and microbiota were assessed.

Main Results:

  • Catheterization did not cause abnormalities in tissue appearance or electrical resistance.
  • Bacterial introduction and localization within loops were successful.
  • Gene expression of cytokines (IFNγ, IL1α, IL4, IL6, IL12p40, IL18, TGFβ1, TNFα) and inducible nitric oxide synthase remained unchanged.
  • Broad-spectrum antibiotics did not sterilize loops but reduced bacterial numbers and altered microbiota composition.
  • No significant adverse effects on overall animal health or intestinal function were observed.

Conclusions:

  • Catheterized intestinal loops are a feasible and safe model for studying host responses in sheep.
  • Allowing for animal recovery post-surgery and pharmaceutical clearance is crucial for accurate study outcomes.
  • This model facilitates research into ruminant gastrointestinal treatments and host-pathogen interactions.