Cardiac lesions in broilers which died without clinical signs.

Area of Science:

• Veterinary Pathology
• Avian Medicine
• Cardiovascular Studies

Background:

• Sudden death in broiler chickens often lacks clear clinical signs or gross lesions.
• Understanding the underlying histopathological changes is crucial for diagnosing mortality causes.

Purpose of the Study:

• To investigate the histopathological findings in broiler chickens experiencing sudden death.
• To identify the primary lesions associated with unexplained mortality in broiler flocks.

Main Methods:

• Histopathological examination of 54 broiler chickens that died suddenly.
• Microscopic analysis focused on cardiac tissues, specifically coronary arteries and myocardium.
• Topographical analysis to correlate necrotic areas with vascular changes.

Main Results:

• Arteriolosclerotic changes, characterized by intimal smooth muscle cell proliferation in small coronary arteries, were observed in 96.2% of cases.
• Myocardial necrosis or scarring was present in 74.1% of cases, predominantly in the left ventricle.
• A close topographical relationship between arteriolosclerosis and myocardial necrosis was noted in 26 cases.

Conclusions:

• Arteriolosclerosis of small coronary arteries is a significant finding in sudden death cases of broiler chickens.
• Myocardial necrosis is frequently associated with these vascular changes, suggesting a potential link.
• Further investigation is needed to elucidate the exact etiology, especially in cases without clear arteritis.