Control measures of sheep salmonellosis

Salmonellosis of sheep is mainly caused by Salmonella typhimurium, Salmonella abortus and Salmonella Dublin. It is characterized by dysentery in sheep and abortion in pregnant sheep.

Pathogen

The pathogen of salmonellosis in sheep belongs to Enterobacteriaceae and Salmonella.

Epidemiology

Salmonellosis in sheep can occur all the year round and can be infected in livestock and poultry of all ages. Mainly digestive tract infection, mating and other ways can also be infected; a variety of adverse factors can promote the occurrence of the disease.

Symptom

The incubation period varies according to the age, stress factor and invasion pathway of the animal.

1. Paratyphoid fever of dysentery lambs is common in lambs aged 20 days, with depressed spirit at the beginning of the disease, body temperature rising to 40 ℃, bow back, loss of appetite or refusing to eat. He was weak, haggard, and could not afford to lie on the ground. He died within 5 days after 1mi. Most diseased lambs have abdominal pain, diarrhea, elimination of a large number of gray-yellow paste feces, rapid symptoms of dehydration, sunken eyeballs, physical weakness, and some diseased lambs have symptoms such as shortness of breath, mucous nasal discharge, cough and so on.

2. Abortion with paratyphoid fever is common in the last two months of pregnancy. The body temperature of the diseased sheep rose to 40 ℃ 41 min before abortion, anorexia, depression, diarrhea in some sheep and vaginal discharge. Live lambs born to sick sheep are relatively weak, do not eat milk, and may have diarrhea, and generally die within 7 days. The diseased sheep were associated with enteritis, gastroenteritis and septicemia.

Pathological changes

The emaciation of diseased sheep can be seen in lower dysentery sheep. The true stomach and intestines are empty, the mucous membrane is congested and the internal solution is thin. The mesenteric lymph nodes were enlarged and congested, the spleen was congested, and there were small bleeding spots in the renal cortex and epicardium.

The abortion sheep died within a few days of stillbirth or newborn lambs, showing septicemia. Tissue edema, hyperemia, hepatosplenomegaly, gray necrotic foci. Placental edema and bleeding. Ewes have acute hysteritis, uterine swelling of aborted or stillborn fetuses, necrotic tissue, exudates, and retained placenta.

Diagnosis

Preliminary diagnosis can be made according to epidemiology, symptoms and pathological changes, and laboratory diagnosis is necessary for diagnosis.

Prevention and cure measures

Strengthen feeding and management, do a good job of disinfection and eliminate the source of infection.

Lambs were given oxytetracycline or neomycin three times a day for 30-50mg/Kg weight, and adult sheep were given intramuscular or intravenous injection of 10-30mg/Kg weight twice a day.