However, due to the widespread distribution and serious harm of house dust mite, it can be considered that house dust mite is a parasitic disease that consumes nutrition for a long time, harms health and causes serious economic losses to cattle.
Inner Mongolia Ximeng Animal Husbandry Research Institute cooperated with our station to carry out the experiment of pesticide fenthion crude oil to control yak skin fly larva disease in our province.
A regional control experiment was conducted in Datong cattle farm. Yaks were treated at a weight of 7 mg/kg and injected intramuscularly, and 8597 yaks were controlled. The situation is briefly described as follows.
1. Drugs used: pesticide fenthion crude oil, specific gravity 1.25, crude oil content above 87% (i.e. crude oil content per ml 1087 mg).
It has the efficacy of contact and internal inhalation, low toxicity to warm-blooded animals and stable to heat, light and alkali.
This is a product of Shenyang pesticide plant.
2. Safety test: Yaks were divided into three groups according to the dosage of 15 mg, 20 mg and 25 mg per kg body weight, and each group was given intramuscular injection 5 times, and 15 was given intramuscular injection.
Only in the 25 mg group, one calf appeared drug reaction and healed itself without treatment, which was considered safe.
3. Insecticidal efficacy test: Yaks were divided into five groups according to the five doses of 3 mg, 5 mg, 7 mg, 9 mg and 1 1 mg per kilogram of body weight, with 5 animals in each group and 25 animals in each group.
After 57 days of injection, 3 experimental cows were slaughtered in each group, and the number of worms killed by fenthion in the submucosa of bovine esophagus was dissected and recorded.
The results showed that the insecticidal effect of 3 mg group was 66.6%, and that of 5 mg group was 1 1 mg group was 100%.
4. Regional control test: Based on the efficacy test after the safety test, a regional control test was conducted, and 8597 yaks (including a few cows) were injected at a dose of 7 mg per kilogram of body weight, including calves 17, adult cows 1 head, and 65438 * *.