In early April 2006, a veterinary outpatient clinic in our city received two chickens and chickens from a chicken farmer for treatment. After detailed investigation and analysis by the clinic veterinarians to the chicken farmer, according to the clinical symptoms of chickens, post-mortem necropsy changes and laboratory test results, the final diagnosis was chronic fluorosis.
1 Incidence The chicken farmer had more than 200 2-month old broiler chickens. In the past two weeks, 11 broilers had died, and 67 had morbidity. The incidence rate was 33% and the mortality rate was 5%.
2 Clinical symptoms: Chicken cocks are white, squatting down, quivering, filthy feathers, sloppy feathers, leaned forward, lying down, legs outstretched, leg muscles appear ankylosed, leg bones thickened, and change. Soft, easy to fracture, reduced intake. Some chickens showed increased excitability, panic, muscle tremor, and finally died of exhaustion.
3 The autopsy showed that the deformed, thickened and softened leg bones were calcified; the periosteum and tendon sheaths were calcified; the bleeding spots were found in the laryngeal and tracheal mucosa; the mucus was found in the trachea; the hernia sac was empty; the glandular stomach serosa and myogastric mucosa were The lower layer has bleeding spots, extensive duodenal and intestinal bleeding; the liver is slightly swollen, brittle, dark red, with necrotic lesions on the surface; splenomegaly, dark purple, brittle; slightly swollen kidneys, The texture is relatively brittle, the color is dull, and the membrane and the surface have different bleeding points.
4 The laboratory tests sent feeds for broilers to the city's feed testing station and found that the amount of fluorine was excessively exceeded.
5 Etiology analysis As stone powder and calcium hydrogen phosphate have been widely used as calcium and phosphorus supplements in feeds in recent years, stone powder and calcium hydrogen phosphate have high fluorine content. If not, the defluorination treatment or defluorination is not thorough, so that the feed Fluoride content exceeding the safe level (broiler 250 mg/kg, laying hen 350 mg/kg) will cause acute or chronic fluorosis in the chicken after eating the feed. Since the clinical symptoms of the disease are very similar to those of normal calcium and phosphorus deficiency, when testing for feed, it is required to determine the calcium and phosphorus content in the feed at the same time in order to make a final diagnosis.
6 The treatment stopped using the feed containing fluorine exceeding the standard, adding 800 mg/t aluminum sulfate to the feed, and supplemented with multi-dimensional elements.
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