Haemonchus contortus is a nematode of the genera Nematoda, which is hairlike and pale red due to blood absorption; the neck mastoid is conspicuous, conical, extending to the posterolateral side, with a pointed tip, a small bursa, and a There is a back spear-like small tooth; males are 15 to 19 mm long and females are 27 to 30 mm long. Because the white reproductive organs surround the red bloody intestines, they form a red and white line appearance, so it is called Haemonchus contortus, also known as the transfer of stomach parasites. Haemonchus contortus is parasitized in the stomach of ruminants and occasionally in the small intestine. The eggs are released to the outside with the feces, and develop the third stage of infectious larvae in approximately 1 week under appropriate conditions. Infectious larvae have a sheath and can survive in a dormant state for a year and a half in a dry environment. Infectious larvae are fed by the terminal host and are de-sheathed in the rumen, then reach the true stomach and enter the mucous membrane. They mature after 18 to 21 days. Adults are free in the stomach cavity and adult life does not exceed 1 year. The disease is characterized by anaemia and debility. According to relevant data, 2000 parasites parasitized in the real gastric mucosa and sucked blood up to 30 mL per day. A total of 80 sheep raised by a farmer in Linxi County, Chifeng City, were injected with the vaccine virus No. 5, and there was a phenomenon of water feeding and death. There were 22 deaths from April 20 to May 10. Township veterinarians used anti-inflammatory and stomach-stimulating remedy to treat recurrent rumen drugs. The effect was not obvious. They were suspected to have been caused by vaccination. Therefore, one goat was pulled and the disease was analyzed, diagnosed and treated on the spot. The treatment results are reported as follows: 1 symptoms The household has 80 herds of sheep, and no insect repellent measures have been implemented since 2002. Sheep are generally thin and have occasional deaths. The diseased goats were goats, suffering from malnutrition, rough coats, standing unpredictable, pale conjunctiva, high anaemia, edema between the mandibular and lower abdomen, rapid breathing, 82 heart beats, body temperature 37 °C, forcibly unable to stand. 2 necropsy 2.1 The diseased sheep were phlebotomy, lethal, and autopsied. The blood was light red, thin as water, and the subcutaneous fat was capsule-like. There was a water-like capsule-like substance under the neck, and the organs were pale. No other abnormalities were seen. 2.2 There are grass and corn in the rumen. A few reddish worms are found on the stomach wall. Some are red and white. The stomach and flaps have more worms in the stomach. Real stomach food lice are few, but there are layers of interweave. A mass of insects. 2.3 After cleaning the rumen, reticulum, valve-stomach, stomach and intestinal worms with water, more than 3,560 worms were found. 2.4 Microscopic examination of serum in the laboratory, no bacteria were detected, and the eggs were examined by fecal floatation. 3 Diagnosis According to clinical symptoms, anatomy and laboratory tests, it was diagnosed as Haemonchus contortus. As parasites are heavily parasitized, they cause severe anemia and weight loss in the sheep and cause death. As a result of the injection of vaccines, stress response promoted the accelerated death of the diseased sheep. 4 treatment 4.1 The worms were commonly dewormed with ivermectin at a body weight of 1 mL/100 kg, and the insects were repeatedly repelled at intervals of 7 days. 4.2 Intensive treatment for severely ill sheep that cannot eat grass or stand up, and increase nutrition and strengthen nursing care. 4.3 Feed supplements rich in protein and minerals (especially iron). After 15 days, all the sick sheep recovered. 5 Preventive measures 5.1 Preventive insecticide. The entire group of sheep was dewormed according to the local parasite's infection. Planned anthelmintic insecticides are usually carried out once each in the spring and autumn. In winter, they are killed by highly effective anthelmintic drugs to eliminate ovulatory climaxes in the mucous membranes. 5.2 Drug Prevention. In areas where parasites are severely endemic, diphenylamine sulphides may be mixed in concentrates or salt for self-cooking during grazing. Each sheep consumes about 0.5 to 1.0 g per day for 2 to 3 months. Good preventive effect. 5.3 Strengthen feeding management. Grazing sheep as far as possible to avoid the wet zone, try to avoid the larvae active time, in order to reduce the chance of infection; to establish a clean drinking water point, pay attention to the clean drinking water. Rational supplement of concentrates and minerals to improve the body's own resistance. 5.4 Comprehensive planning of pasture. Planned rotational grazing and timely transfer of grazing land. In order to increase the utilization of grassland, rotational grazing can be carried out with different kinds of livestock. 5.5 Improve pasture management and control the amount of livestock carried. Strengthen manure management in captivity.
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