Prevention and treatment of infectious serositis in ducks

Raise ducks

Duck infectious serositis, also known as duck plague Riemer's disease, is an acute septic infectious disease infecting ducklings, characterized by fibrinous inflammation on the serous surface of the whole body. Its morbidity and mortality are very high, and it has become an important infectious disease harmful to the duck industry. Through the investigation of duck farmers in Weifang and more than a dozen counties and cities in Shandong Province, the author found that the disease occurs in almost every batch of ducks, and the drug cost for the treatment of the disease can reach about 60% of the total drug cost.

First, Epidemiology. All kinds of ducks can be infected, especially muscovy ducks. it mainly occurs in ducklings of 2-5 weeks old. The course of disease is short, often acute, and can occur all the year round, but it occurs frequently in winter and spring. Mainly through respiratory tract or skin injury infection. The occurrence of the disease is closely related to stress factors, which can cause an outbreak of the disease in infected ducks after sudden cold and rain. During the breeding period, too much density, humidity, poor ventilation, lack of vitamins, trace elements and less protein in feed and other factors can easily induce the epidemic of the disease, and the infection rate can be as high as 90%. The mortality rate often varies depending on whether the treatment is timely and appropriate, with a low mortality rate of 5% and a high mortality rate of 80%.

Second, clinical symptoms. The incubation period of the disease is 1-3 days, and some can be as long as 7 days. The most acute cases often die suddenly without any symptoms; acute cases are characterized by depression, necking, somnolence, mouth arching, soft legs, reluctance to move, ataxia, not eating or eating less, eye secretions, often adhesion and shedding of feathers around the eyes, secretions in the nostrils, yellowish green feces and abdominal distension. Before death, he had spasms, shook his head, straightened his back and legs, and died of convulsions. General sick ducks from obvious symptoms to death for about 1-2 hours, rarely more than half a day; subacute or chronic cases, mostly 7-8-week-old ducks, the course of disease can be more than a week, sick ducks are depressed, eat less or do not eat, lie on the ground, unwilling to move, soft and weak feet, dry skin, related arthritis. Standing dog sitting, dyspnea, ataxia, torticollis, twirling, retrogression, weight loss, and finally death.

Third, diagnosis. The diseased duck liver and heart exudates were inoculated on chocolate Agar plate and cultured in an anaerobic tank for 24 hours. Round, raised, smooth, creamy and translucent colonies could be seen. Microscopic examination of this colony smear showed that the bacteria were oval, single or double arrangement of negative bacilli, most of which were stained at both poles. Duck infectious serositis can be diagnosed according to epidemiology, clinical symptoms, autopsy changes and laboratory tests.

IV. Prevention and treatment

1. Treatment: in order to avoid using drugs blindly, it is best to screen drugs through drug sensitivity test. This avoids the need for distance and makes it easier to operate The disease is sensitive to spectinomycin, florfenicol, levofloxacin and other drugs. First, the diseased ducks were isolated and injected with 4% levofloxacin injection, 0.2 ml per kilogram of body weight. Large flocks of ducks were added Chuan Li Jian (spectinomycin) to the water twice in the whole day, each bottle mixed with water 150 kg. In addition, during the onset of the disease, the usual disinfection of ducks twice a week was changed to once a day, and Baidu was added to disinfect drinking water in the proportion of 8000 in the sink. The dead ducks were burned or buried deeply to prevent the spread of the epidemic and the residue of pathogens.

2. Prevention: the inactivated vaccine of Riemerella anatipestifer can be used for the prevention of this disease, and the inactivated vaccine can be vaccinated once at the age of 10-14 days and 2-3 weeks respectively.