This disease is a chronic disease caused by parasitism of nasal flies parasitizing in the nasal cavity and frontal sinus of sheep. 1. Pathogen The pathogen of this disease is nymphs of the nose flies. Its adult is a sheep flies and looks like a bee. In the summer and autumn, the female flies produce larvae around the nostrils of the sheep. The larvae crawl into the nasal cavity, sinuses and frontal sinuses along the nasal mucosa. The larvae, like millet grains, grew up in the nose, nasal sinuses and frontal sinuses. They became the third stage larvae after 9-10 months, about 3 cm long, and the color changed from white to yellow and brown again. When the sheep sneezes, the larvae land on the ground and drill into the shallow soil to become bored. After 1-2 months, the pupae become a fly. 2. Symptoms Adult flies in the larvae of the sheep's nostrils make the sheep panic, shake their heads, run, affect the sheep's feeding, rest and activities, physical decline. The larvae penetrate into the nasal cavity and their horny hooks can cause inflammation or ulceration of the nasal mucosa. The purulent nasal discharge that is mixed with blood flows from the nose. Because of the large amount of nasal fluid that plugs the nostrils, it makes breathing difficult and often sneezes. Friction on the ground. Loss of appetite, weight loss. Individual larvae can also enter the cranial cavity, injuring the pleura, causing neurological symptoms, movement disorders, shaking the head, turning around, etc., can cause death. 3. Prevention (1) During the flying season of the nose fly, apply 6 drops of dripping ointment and wood tar around the nostrils to repel the nose flies. (2) At the end of the fall, the nose flies disappeared and they were injected into the nasal cavity with 6 aqueous solutions of trichlorfon, with 50-60 ml of nasal cavity per side; or with trichlorfon taken orally, 10-20 g per kilogram of body weight, and appropriate amount of water, once per serving; Spray 5% of the solution to the nostrils of the sheep. (3) Diarrhea net treatment. The nevus net into 5% of the aqueous solution, nasal spray, spray 10-12 ml into each side of the nostril. China Agricultural Network Editor
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