Clinical manifestations of reovirus infection in stunted chickens

Rajesh Singh, D.K. Agrawal and R.S. Chauhan
Department of Veterinary Pathology, College of Veterinary and Animal Sciences
G.B.Pant University of Agriculture and Technology,
Pantnagar - 263145, U.S. Nagar, Uttaranchal

Avian reovirus is one such infection that have emerged to inflict economic losses in poultry due to malabsorption, malassimilation or nutritional disorders which include diarrhoea, catarrhal enteritis, stunted growth, poor feathering, leg abnormalities and reduced egg production. The present investigation was carried out on 40 vaccinated (against RD) broiler chickens of 1week age (divided into Control and Reovirus infected group, 20 chickens in each group) for a period of 20 days to study the clinical manifestations of reovirus infection. All the broiler chickens were kept under identical feeding and managemental conditions throughout the experimental study. The broiler chickens of group-B were infected with avian reovirus @ 1ml of 10 7 TCID 50/ bird and of group-A were given 1ml normal saline solution. The broiler chicks were examined daily, morning and evening for the development of clinical symptoms and mortality, if any. Clinical manifestations were observed in reovirus-infected group while the control group did not reveal any clinical sign. Chicks of the reovirus infected group showed poor feathering, weakness and pasted vent. The chicks were also dull and depressed. Presence of undigested feed in the faeces and diarrhoea was seen in stunted chicks. There was unevenness in growth rate of broiler chicks that observed between 1-2 weeks of age with maximum difference in size at 3-4 weeks of age. The average weight of the infected chicks was 150 gm, 175gm, 260 gm and 350 gm at day 5, 10, 15 and 20, respectively against the average weight of 230gm, 290gm, 460gm and 520 gm of control chicks, respectively. The average weight of infected chicks was too low as compared to the apparently healthy chicks. Overall loss of weight in infected chicks in comparison to the average weight of control chicks of the same hatch was approximately 50%. The reduction in size and weight of the infected chicks constitute an important finding of the experiment, as it is the main sign of stunting in chick.

Source : IPSACON-2005

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