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Information Journal Paper

Title

AVIAN ENCEPHALOMYELITIS IN LAYER CHICKENS

Pages

 Start Page 73 | End Page 77

Abstract

 Avain encephalomyelitis is one of the most important avian diseaes, sometimes causes heavy damage in poultry in dusty of Iran. In one of two flocks of leghorns chickens, In a farm in Fars province, the same one day old relatively hight mortality accompanied and the various nervous signs were seen. Clinical signs mainly included: sickness, tremor of head and neck, ataxia and neck deviation. Nearly 50% of the first flock was affected and because they could not use water and feed, mortality rate was increased. But in the second flock, being relatively connected to the first flock, there were not any clinical signs. Inspite of similarity in diets and addition of supplementary vitamins and minerals recovery was not seen. Blood sampling from both healthy and sick chickens and subsequently HI test was done. Mean antibody titers against Newcastle disease virus in both flocks were equel to 4.5. Therefore, sick and dead chickens were necropsied. But there were not macroscopic pathognomonic lesions except, some mild petechiation in the digestive system. In histologic sections, increased lymphatic follicles in pancreas, proventriculus and heart were seen. In addition, infiltration of lymphoid cells in muscular layers of cerebellum and central chromatolysis in neurons of cerebrum were observed. As a result, on the basis of special histopathologic lesions avian Encephalomyelitis was diagnosed. Apparently, two flocks did not belong to an identical breeder layer. Besides, vertical transmission in this disease has explained the soundness of the second flock.

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