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Poultry Science, Vol 77, Issue 8, 1150-1155
Copyright © 1998 by Poultry Science Association

Articles

Pathogenesis of enteric diseases

FJ Hoerr

Department of Pathobiology, College of Veterinary Medicine, Auburn University, Alabama 36830, USA. fhoerr@mindspring.com

The pathogenesis of digestive disease in poultry involves the cellular events and reactions that result in a deviation from normal structure and function. To a degree, the differentiation of disease and normal in commercial poultry also involves an economic perspective. Factors external to the digestive tract may mimic digestive disease, including reductions in the density of various nutrients and feed refusal. Antinutritional factors, such as certain storage polysaccharides and proteins, are inaccessible to endogenous enzymes and are either indigestible or act as blockers of the digestion of other nutrients. Changes in digestive secretions that result in either excess or deficiency also influence digestive structure and function. Infectious agents and toxins that cause degeneration and necrosis are especially injurious because a series of critical repair events must occur in order to regain function. The consequences range from lethal injury of the host animal to diminished performance. The digestive tract has a large component of lymphoid tissue and impairment of the immune system influences the course of protozoan, bacterial and viral enteric diseases.


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