Control of bursal disease and streptococcosis in farmed sheep

In August and September every year, the climate changes from high temperature and high humidity to cool breeze, and sheep adjust their own conditions accordingly in order to adapt to environmental changes. at this time, their resistance decreases, and it is extremely easy to be infected with scorch disease and streptococcosis, seriously endangering the health of sheep. Now according to a received case to talk about the prevention and treatment of the two diseases.

I. morbidity

A total of 120 sheep raised in a sheep farm suddenly fell ill in early August. The diseased sheep showed symptoms such as high fever, asthma, tears, jaundice and so on. The owner was diagnosed and treated according to a cold and injected intramuscularly with antongding, Bupleurum, ribavirin, penicillin and other drugs. After three days of continuous use, the symptoms were alleviated, but as soon as the drug was stopped, the disease relapsed and became thin. The diseased sheep began to die sporadically, and a total of 5 sheep died. Because of the complicated condition, he came to the veterinary station to see a doctor.

Second, clinical symptoms

The sick sheep showed depression, loss of appetite, body temperature rising to 40 ℃ ~ 42 ℃, delayed for 4 to 7 days, dyspnea, dyspnea, stopping ruminating, weakening of gastrointestinal peristalsis, conjunctival congestion and tears, anemia and mild jaundice, salivation. Enlargement of body surface lymph nodes in pharynx, larynx and submandible. Some sick sheep pull foul-smelling thin feces mixed with mucus or blood. Pregnant sheep miscarried, individual sheep turbid urine or hematuria, the course of disease 6-12 days, diseased sheep pre-death molars, convulsions, limb stiffness.

III. Pathological changes

Extensive bleeding in various organs, emaciation of the body, thin blood, incomplete coagulation, jelly-like subcutaneous fat, a little bleeding. The whole body lymph nodes showed swelling and bleeding in varying degrees, especially in front of shoulder, mesentery, liver, lung and so on. The section was juicy, congested and bleeding. Some lymph nodes were gray and white, and sometimes granular protuberances could be seen on the surface. Mucous membrane bleeding of nasal cavity, throat and organs. Pulmonary edema, emphysema and bleeding. Enlargement of liver, spleen and gallbladder, pleural and peritoneal effusion. The kidney is yellowish brown with nodules and punctate bleeding on the surface. There are ulcer spots on the true gastric mucosa and a small amount of bleeding on the intestinal mucosa.

IV. Laboratory inspection

According to the above symptoms and changes of autopsy, a preliminary diagnosis can be made. The final diagnosis must depend on laboratory tests. Take the blood of the ear tip of the diseased sheep, smear, Giemsa's staining, microscopic examination found that the scorch worm body can be diagnosed; take liver, spleen and other disease materials, smear, Gram staining microscopic examination, there are single, short-chain or long-chain Gram-positive cocci, streptococcosis can be diagnosed. If necessary, bacteria should be isolated and cultured.

V. Therapeutic measures

The sick sheep were intramuscularly injected with Banchenhuang (mainly composed of Radix Isatidis, tangerine peel, ephedra) and lincomycin hydrochloride at a dose of 0.1 ml / kg in the morning, and ceftiofur sodium was injected at a dose of 30 mg / kg body weight in the afternoon. Astragalus polysaccharides 0.1 ml per kg body weight. After three consecutive days of medication, the diseased sheep were basically cured and there were no recurrent cases.

VI. Prevention and vaccination

Strengthen the feeding and management of sheep, the enclosure, the site should be kept clean, no sharp objects, to prevent all kinds of trauma. Newborn lambs should be disinfected with iodine tincture to prevent infection. Sheep with bacteria should be eliminated as far as possible, sick and dead sheep and pollutants should be burned, and the environment and appliances should be thoroughly disinfected with 3% Lysol, 2.5% formalin or 1% bacteriological iodine on a regular basis. Each sheep was vaccinated with Streptococcus ovis vaccine and gained immunity for 4 months. In the season with frequent occurrence of bursal disease, sheep were injected intramuscularly with 2% triazamidine solution at a dose of 5 mg / kg body weight, once every 15 days. Jiaochong tablets can also be taken orally, and daily forage added with Anemarrhena, Fritillaria thunbergii, Radix Astragali, licorice, Huangyaozi, Artemisia annua and so on, can effectively prevent the occurrence of the disease.

VII. Summary

Bursal disease and streptococcosis have become the first incidence of infection in sheep. Once they get sick, they will cause great losses. When there are suspected sick sheep in the flock, blood samples should be taken in time to be sent to the laboratory for testing. do not delay the disease by using drugs blindly based on experience.