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Related Experiment Videos

Ultrastructural abnormalities in seven-day-old broilers reared at high altitude.

M H Maxwell1, C W Mbugua

  • 1Agricultural and Food Research Council's Institute for Grassland and Animal Production, Poultry Department, Roslin, Midlothian.

Research in Veterinary Science
|September 1, 1990
PubMed
Summary

High altitude exposure causes fine structural abnormalities in young broilers, affecting the heart, kidney, and lungs. These early changes suggest broiler embryos may be vulnerable to low oxygen tension.

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Area of Science:

  • Veterinary Pathology
  • Avian Physiology
  • Altitude Medicine

Background:

  • High altitude rearing in broilers is associated with ascitic syndrome and tissue abnormalities.
  • Previous studies noted these changes in older birds (four-week-old).
  • The impact of high altitude on very young broilers (seven-day-old) requires further investigation.

Purpose of the Study:

  • To describe fine structural abnormalities in seven-day-old broilers reared at high altitude.
  • To compare early tissue changes with those observed in older, ascitic broilers.
  • To assess the potential risk to broiler embryos from low oxygen tension.

Main Methods:

  • Histological examination of heart, kidney, and lung tissues from seven-day-old broilers reared at high altitude.

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  • Microscopic analysis for myofibril disorganization, mitochondrial changes, tubule morphology, capillary congestion, and nodule formation.
  • Comparison with findings from previous studies on older broilers.

    • Main Results:

    • Seven-day-old broilers exhibited heart abnormalities including myofibril disorganization and mitochondrial hyperplasia.
    • Renal changes primarily involved alterations in tubule morphology.
    • Lung tissues showed capillary congestion, engorged parabronchi, and increased cartilaginous/osseous nodules in older birds.

    Conclusions:

    • Early-onset fine structural abnormalities in young broilers indicate potential risks associated with high altitude rearing.
    • The observed changes resemble those in older birds with ascitic syndrome, suggesting a progressive pathology.
    • Broiler embryos may be particularly susceptible to developmental abnormalities when exposed to low oxygen tension.