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Detailed Explanation of the Pathological Lesions of Chicken Infectious Anemia
The most characteristic necropsy lesion of uncomplicated chicken infectious anemia is bone marrow atrophy. The bone marrow of the femur is fatty-colored, pale yellow, or pink; the thymus is atrophied and congested, and in severe cases may undergo complete involution. As the age of affected chickens increases, thymic atrophy is more readily observed than bone marrow lesions. Bursal atrophy is not obvious and is often transient; sometimes the weight is reduced and the volume is decreased, while in most affected chickens the bursa of Fabricius appears semi-transparent. In severely affected cases, the liver and kidneys may be seen to be enlarged, yellowed, and friable. Hemorrhage of the proventricular mucosa and subcutaneous and muscular hemorrhages are sometimes observed.
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Basic Methods and Procedures for Diagnosing Chicken Diseases: Laboratory Pathological Diagnosis
Take the typical tissues and organs of a dead chicken, cut them into pieces 1.5-3mm x 5mm in size, soak the tissues in 10% formalin solution or 95% alcohol for fixation, then section and stain the fixed tissue samples, and examine the pathological changes under a microscope. In poultry disease diagnosis, histopathological examination is used for: Marek's disease of chickens and avian leukosis to examine tumors; infectious laryngotracheitis of chickens, inclusion body hepatitis of chickens, fowl pox, etc. to examine inclusion bodies; avian encephalomyelitis, Marek's disease of chickens, etc. to examine brain and spinal cord lesions. The histopathology of certain infectious diseases in chickens has relatively characteristic changes
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What are the pathological changes of aflatoxin poisoning in pigs?
In acute cases, anemia and hemorrhage occur, with massive bleeding in the thoracic and abdominal cavities, and petechial spots often on the serous membrane surfaces. Hemorrhage occurs in the subcutaneous muscles in front of the thigh and under the scapula. The liver is enlarged with bleeding points. In the part of the liver adjacent to the serous membrane there are pinpoint or ecchymotic hemorrhages, obvious hemorrhages are common on the epicardium and endocardium, and hemorrhages are often present throughout the body muscles. In chronic cases, there is proliferation and sclerosis of the liver bile ducts, yellow fatty degeneration of the liver, white spots or necrotic lesions on the liver surface, and effusion in the thoracic and abdominal cavities. The renal cavity is pale and swollen. The systemic lymph nodes are congested and edematous.
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Symptoms and Pathological Features of Snake Venom Poisoning in Animals
Snake venom poisoning is an acute toxic disease caused by venomous snake bites in animals, in which the venom enters the body through the wound and causes hemolysis, paralysis of sensory nerve endings and shock as its characteristic features. It can occur in all kinds of animals, and is commonly seen in grazing animals and dogs. 1. Clinical symptoms The sites where animals are bitten by venomous snakes are mostly the lips, nose tip, face and lower parts of the limbs. In horses, cattle and sheep, the bite sites are mostly near the hock joint or fetlock joint, while in pigs and dogs they are mostly on the limbs and nose tip. The closer the bite site is to the central nervous system and to areas rich in blood vessels, the
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