Atherosclerosis is a common cardiovascular disease in birds, especially chickens. It is caused by the accumulation of fatty substances such as cholesterol, cellular waste products, and calcium (referred to as plaque) inside arteries. The buildup of plaque results in the obstruction of blood flow, and will travel to other parts of the body.
Chickens can develop atherosclerosis from any one or combination of the following:
- Poor Diet: Consumption of a high-cholesterol diet, a diet low in polyunsaturated fatty acids (PUFA) and high in saturated fatty acids, or a high-fat diet enriched in linoleic acid.
- Viral induced: Infection with the Marek's disease virus, which is known to cause atherosclerotic-like lesions in the arteries. It can also infect the smooth muscle cells, leading to accumulation of cholesterol in the arteries.
Signs of Atherosclerosis in Chickens
Chickens won't usually develop any clinical signs of the disease until the advanced stages, when the artery is severely narrowed or completely blocked. Many times, the first indication of the disease is sudden death related to an unknown cause.
When clinical signs do occur, they are usually associated with cardiac failure, caused by reduced blood flow through the arteries. Which may include lethargy, exercise intolerance, difficulty breathing, ataxia, and behavioral changes.