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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.

|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.

Keywords:

imminent death predictive signs welfare parameters

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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.