Necrotic enteritis in laying hens is a digestive tract infectious disease caused by *Clostridium perfringens* types A and C. It is characterized by pathological necrosis of the intestinal mucosa in affected birds and occurs mainly in chicks aged 2-5 weeks. Sudden changes in feed, excessive fish meal or wheat in the feed, and disruption of the normal intestinal microecological environment due to antibiotic misuse can all trigger the disease.
Clinical signs: depression, reduced appetite, diarrhea, and sudden death.
Necropsy findings: The small intestine, especially the jejunum, is dilated and filled with gas. The intestinal wall is thin, fragile, and hemorrhagic; the mucosa is necrotic, forming a necrotic pseudomembrane.
Prevention:
1, formulate feed ingredients appropriately and avoid excessive fish meal and wheat bran.
2, prevent coccidiosis and other intestinal diseases, and avoid factors that can damage the intestines of chicks.