High Mortality rate of Encephalomyelitis in chickens how to prevent and treat Encephalomyelitis in layers

Chicken encephalomyelitis, mainly harmful to laying hens, is an infectious disease, which is mainly characterized by ataxia, paralysis and head tremor in chicks. Layer encephalomyelitis can occur in four seasons, through horizontal, vertical transmission, sporadic, regional epidemic. Morbidity and mortality are related to the age of laying hens, the number of susceptible laying hens and the virulence of the virus. In laying hens, the morbidity was 40 60%, the mortality rate was 10 25%, or even higher, the laying rate decreased by 5 45%, the hatching rate of breeding eggs decreased by 10 35%, and the stillbirth rate increased sharply 3 days before hatching.

Laying hens

1. Clinical symptoms:

During the onset of the disease, the incubation period was 6-7 days, and the typical symptoms were mostly seen in the chicks in the laying hens, showing nervous tremor. However, when the adult laying hens were infected, the clinical symptoms were not obvious, and the spirit, feces, feed intake, water intake, egg color and so on were all normal, but the egg production decreased sharply, the egg weight decreased and the egg became smaller, and the egg production recovered after about 15 days.

II. Prevention and control measures

1. At present, there is no special treatment for encephalomyelitis of laying hens, so we can only strengthen the feeding and management of the layers, and keep the henhouse warm and ventilated.

two。 Keep strict control of the chicken breeding farm. If the breeder chicken has encephalomyelitis, before the egg production returns to normal, or within at least half a month from the day when the egg production of the breeder chicken decreases, the breeding eggs can not hatch and can be treated as commercial eggs.

3. Vaccination, in the epidemic area, breeder chickens should be vaccinated against infectious encephalomyelitis at the age of 100 to 120 days.

4. Drug prophylaxis. If the laying hens in the peak laying period get encephalomyelitis, in order to prevent the loss, the laying hens can be given some astragalus polysaccharides and broad-spectrum antibiotics to improve immunity and prevent secondary infection.