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Signs Indicating Imminent Death in Escherichia coli-Infected Broilers
M G R Matthijs1, J F Nieuwenhuis1, R M Dwars1
1Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, 7 Yalelaan, 3584 CL Utrecht, the Netherlands.
Avian Diseases
|September 29, 2017
Summary
Clinical signs like reduced attention and altered posture in broiler chickens inoculated with E. coli predict imminent death. These observable signs, visible from a distance, can inform timely interventions to prevent animal suffering.
Area of Science:
- Veterinary Medicine
- Animal Health
- Poultry Science
Background:
- Escherichia coli (E. coli) infection is a significant concern in broiler chickens.
- Early detection of disease progression is crucial for animal welfare and flock management.
Purpose of the Study:
- To identify clinical signs in broiler chickens that predict imminent death following E. coli inoculation.
- To evaluate the predictive value of observable signs for timely intervention.
Main Methods:
- Broiler chickens were intratracheally inoculated with E. coli.
- Hourly observations for clinical signs (attention, locomotion, posture, respiration) were conducted.
- Time from first sign observation to death was recorded for individual birds.
Main Results:
- Observable clinical signs, particularly altered attention and posture, were predictive of imminent death.
- 75% of affected birds died within 20 hours of exhibiting these signs.
- Extended clinical measurements showed less predictive value compared to gross observations.
Conclusions:
- Simple, observable clinical signs in broiler chickens infected with E. coli are reliable indicators of impending mortality.
- These findings support the development of protocols for early intervention to mitigate animal suffering.
- Remote observation of broiler chickens can effectively identify birds at high risk of death.
