Calf neocariasis is a nematode disease that is parasitized by calf new roundworms in the calf intestine. It mainly causes symptoms such as enteritis, diarrhea, and abdominal enlargement, and is one of the main parasitic diseases that cause calf death.
1. Pathogens and epidemiology
The pathogen is adult bovine new roundworms, parasitizing the small intestines of calves under 5 months of age.
Adult cattle are mostly parasitic in the migration stage of larvae in internal organ tissues, and adult parasitism is rare.
Cows become infected by eating feed, grass or drinking water contaminated with eggs of infected new roundworms, and the larvae migrate through the cow, passing partly through the placenta to the fetus and partly through milk to the calf. The larvae develop into adults in calves, causing calves to develop disease.
2. Symptoms and lesions
Sick calves can develop depression, indigestion, poor appetite 20 to 30 days after birth; diarrhea, the first discharge of yellow-white dry feces, the back discharge of smelly yellow-white thin feces with mucus; the abdomen is expanded, and the mouth emits a foul smell.
A large number of insect bodies gather into clumps to block the intestinal canal, causing insect-derived intestinal obstruction and even causing intestinal rupture, and severely ill calves often die due to physical weakness. The larvae migrate inside the calves, causing punctate bleeding from the liver and lungs and can cause pneumonia.
3. Diagnosis
Preliminary diagnosis can be made based on the weakness of calves, diarrhea, yellow-white dry feces at the beginning, smelly and mucusy feces in the back, and swelling of the abdomen. Diagnosis requires the detection of eggs or bodies in the stool.
4. Prevention
prophylaxis
Strengthen environmental health management, preventive deworming of calves is an important measure to prevent the disease, many calves are insect-carrying people without symptoms, but the eggs they excrete can pollute the environment and lead to cow infection.
Preventive deworming is performed on pregnant cows, and levamisole is used two months before the cow gives birth to kill the larvae that are lurking in the cows and prevent the invasion of fetal cattle.
treat
Treatment can be optionally levamisole, according to 7.5 mg / kg body weight, once oral or intramuscular injection; or propithiidazole, 10 ~ 20 mg / kg body weight, once oral; can also be selected Chengdu Xingwang Medicine's line mite net for subcutaneous injection, 0.02 ml per kilogram of body weight
