Psoriasis is a chronic parasitic disease that occurs mostly from infections with larvae of the flies and parasitizing the subcutaneous tissues of beef cattle. Veterinary clinical studies have found that if the skin fly larvae burrow into the subcutaneous tissue of the beef cattle, it can cause the beef cattle to have a strong itching and painful feeling, but the skin fly larvae will not bite the cow, but will only frighten the beef cattle, and have a greater impact on the daily rest and feeding of the beef cattle.
1 Hazards of beef cattle cattle cattle skin maggot disease
1.1 Date of adult fly activity and hazards at spawning
Usually, the time for beef cattle skin flies to become flies is from May to August of each year, especially in the humid and high temperature of June, beef cattle skin fly maggot disease is more common. If there is enough sunlight, and the weather is warm, there will be a large number of female flies flying to the periphery of the cattle, spawning in the coated part of the beef cattle, reaching a certain number, beef cattle will have symptoms such as kicking and nose spraying, beef cattle show a high degree of uneasiness, panic, their daily rest and feeding will be intermittently interrupted, beef cattle feeding volume declines, food nutrition can not meet the normal growth needs of beef cattle. Beef cattle are gradually emaciated. In addition, there are some beef cattle to listen to
After the sound of the female fly, it will run wildly with its tail upright, and the resulting miscarriage and fall injuries are not uncommon, which seriously affects the economic benefits of beef cattle breeding.
1.2 Hazards during larval migration
When the larvae burrow into the skin through the hair follicle of the beef cattle, the beef cattle appear restless, itchy, rash and other conditions. As the larva slowly migrates to the adipose tissue outside the spinal duct, it can seriously damage the tissues of various parts of the beef cattle's body; the larvae sometimes burrow into the beef cattle's brain, and the beef cattle will have a series of neurological symptoms, including syncope, paralysis, etc., and even severe cases may cause beef cattle death. If the larvae burrow into the subcutaneous tissue of beef cattle, they may cause inflammation of the esophageal serous membrane and pharyngeal serous membrane of beef cattle, which will hinder the normal swallowing of beef cattle.
1.3 Hazards of larvae parasitizing under the skin on the back of cattle
When the larva migrates to the subcutaneous tissue of the back of the beef cattle, and after 2 to 3 months of parasitism, a tumor will appear on the back of the beef cow, which may appear inflamed and suppurative, which will cause greater harm to its daily rest and feeding, and the beef cattle will gradually lose weight. In addition, beef cattle cowhide fly maggot disease will also bring scars to the cowhide, seriously reducing the use value of leather.
1.4 Hazards of larvae producing toxins
When the larvae parasitize, they will produce a large number of toxins, which will reduce the milk production of cows, beef cattle are emaciated, anemic, and reduce the meat quality and meat volume of beef cattle.
According to the survey, once the beef cattle are invaded by the bovine skin fly, the average daily milk production of beef cattle is reduced by 1.8 to 2.0 kg, the meat production is reduced by 15 to 20 kg, and the mortality rate of beef cattle due to miscarriage and falls is as high as 1.5% to 2.8%.
2 Diagnosis of beef cattle cattle skin maggot disease
Based on the epidemiological data of local beef cattle cattle skin maggot disease (source of sick cattle, degree of disease, epidemic season, etc.), and also pay attention to palpation of nodular swelling of the subcutaneous tissue of the back of the cow, if it is found that there are problems such as pus scab, pus, slurry in the middle of the nodular swelling, then the way of hand squeezing can be used, once the insect body falls out, then it can be confirmed that beef cattle do have psoriasis.
3 Prevention and control measures of beef cattle bovine skin fly maggot disease
3.1 Strengthen the work of fly control
In summer, the barn is regularly sprayed with fly killers (DDT, pyrethroids, etc.). In order to be able to eliminate the adult worms that have laid eggs, the cattle can also be sprayed once every once in a while, and the spraying agent can choose a concentration of 4% to 5% of DDT, and the spraying frequency is controlled at 8 to 10d / time.
3.2 Maintain bovine hygiene
In order to ensure the cleanliness of the cattle body, the cattle can be brushed frequently, and once the back of the beef cattle is found to be tumored, the back of the beef cattle can be washed (the scrubbing agent is a 2% solution of the insect repellent, and the washing frequency is controlled at 10 to 20 days). If the tumor is soft, the larvae in the beef cattle nodule can be squeezed out with your fingers.
3.3 Eliminate larvae in beef cattle
Once a beef cow is suspected of having psoriasis, a certain amount of hypothiophos (4 to 10 mg/kg.bw) can be injected intramuscularly to repel the parasitic larvae in the beef cattle. At the same time, "acetone solution + fly venom phosphorus" should also be injected intramuscularly into the buttocks of beef cattle.
3.4 Carry out prevention and treatment work at the best dose, the best drug and the best time
Cattle farms should inject beef cattle with 1% subcutaneous ivermectin at a dose of 0.5 ml / head / time every autumn. It can effectively control psoriasis.
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