The causative agent of calf neocarpus disease is the new roundworm of the calf, which parasitizes the small intestine of newborn calves and causes symptoms such as enteritis, diarrhea, abdominal enlargement and abdominal pain. The disease is most common in calves in the southern provinces of China. When a large number of newborn cattle are infected, they can cause death, which is very harmful to the development of the cattle industry.
【Cause】Calf new roundworm insects are large and yellowish. Females lay eggs in the small intestine, and the eggs are excreted with feces. After the cow swallows the infected egg, the larvae escape in the small intestine, go through a series of processes, enter the womb of the pregnant cow, and are swallowed into the intestine by the fetal cow or through the lungs and liver, and migrate to the human intestine to develop. After calves are born, the larvae metamorphose in the small intestine and become adults after 25 to 31 days. Adult worms live in the small intestine for 2 to 5 months and are constantly excreted.
【Symptoms】 The most serious period of calf victimization is after 2 weeks of birth, and its symptoms are indigestion, loss of appetite, enteritis, diarrhea, bloody stools, and a special odor. Abdominal swelling and abdominal pain. Sick cattle are weak and emaciated, mentally weak or restless. The muscles of the hips are relaxed, the hindlimbs are weak, and the standing is unstable. If the intestine parasitizes a large amount of worm body, it can cause intestinal obstruction or intestinal perforation, and cause death. If the larvae invade the liver, in addition to causing digestive disorders, they also destroy the liver tissue. If it migrates to the lungs, it destroys lung tissue, causing punctate bleeding and causing pneumonia. Clinically there is cough, difficulty breathing, and a special sour odor in the mouth. Some have inflammation of the conjunctiva of the eye. 【Diagnosis】The diagnosis of this disease can be based on clinical symptoms and epidemiological characteristics. Clinical symptoms are mainly manifested as diarrhea, sometimes mixed with blood, with a special odor, sick cattle are weak and weak, rough and hairy. The disease occurs mainly in calves up to 5 months of age. The diagnosis must be confirmed by detecting eggs or bodies in the stool.
【Prevention and control measures】
1． Regular deworming Calves are dewormed once at 1 month and 5 months old, and commonly used deworming drugs include halesone, tetraimidazole, or hexachloroethane. The dosage is: HCH for internal use, o. 2～o． 4 g, once a day, for 3 days; Halesone internally, 35 to 50 mg per kilogram of body weight; piperazine phosphate, 0.2 g I tetrathiazole internally, 10-20 mg per kilogram body weight.
2． Prevention It is necessary to pay attention to the cleanliness of the cattle and cattle farms, the mat grass and manure should be cleaned frequently, and the fermentation process should be carried out. When possible, cows and calves are kept in isolation to reduce infection.