What are the clinical symptoms and necropsy changes of caustic soda poisoning in broiler chicks

In caustic soda poisoning, broiler chicks show listlessness, ruffled feathers, difficulty standing, lying down unable to rise, stretching the neck and opening the beak, emitting faint screeches; some have diarrhea, some show neurological symptoms, and they die shortly afterward.

Necropsy changes of caustic soda poisoning in broiler chicks: the liver is enlarged with a purple surface and scattered hemorrhagic spots; the inner and outer membranes of the heart and the coronary fat have petechial hemorrhages; the crop is filled with contents, water and gas; the proventricular mucosa sloughs off; the koilin layer of the gizzard is dry with petechial hemorrhages beneath it; the duodenal mucosa is severely hemorrhaged; the kidneys are dark red with blood clots.