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Related Experiment Videos

Multiple concurrent stressors in chicks. 2. Effects on hematologic, body composition, and pathologic traits.

J M McFarlane1, S E Curtis, J Simon

  • 1Department of Animal Sciences, University of Illinois, Urbana 61801.

Poultry Science
|April 1, 1989
PubMed
Summary

Multiple stressors like ammonia, beak trimming, coccidiosis, electric shock, heat, and noise impact broiler chicks. Their combined effects on health and body composition can be predicted by summing individual stressor impacts.

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Area of Science:

  • Animal Science
  • Poultry Science
  • Environmental Stressors

Background:

  • Poultry production often involves concurrent environmental and physiological stressors.
  • Understanding the cumulative impact of these stressors is crucial for animal welfare and productivity.

Purpose of the Study:

  • To investigate the effects of six concurrent stressors on Hubbard x Hubbard broiler chicks.
  • To determine if the effects of multiple stressors are additive or synergistic.

Main Methods:

  • A 2(6)-factorial experiment was designed with treatments including aerial ammonia, beak trimming, coccidiosis, electric shock, heat stress, and noise.
  • Hematologic parameters, body composition (water, dry matter, crude protein, chloroform-methanol extract), and lesion severity were assessed.

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Main Results:

  • Aerial ammonia and heat stress increased packed-cell volume (PCV), while coccidiosis decreased it.
  • Heterophil percentage increased and lymphocyte percentage decreased with aerial ammonia, electric shock, heat stress, and increasing stressor order.
  • Body composition traits generally responded similarly whether stressors were applied singly or concurrently.

Conclusions:

  • Individual stressors had predictable effects on hematologic and body composition traits, even under multiple concurrent stress conditions.
  • The cumulative effects of multiple, unrelated stressors on broiler performance can be approximated by summing the effects of individual stressors.