National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
A retrospective study was conducted to understand the epidemiology of infectious bursal disease (IBD) in broiler chicken flocks in Haryana state. The epidemiological data related to IBD outbreaks for the period from January 2008 to June 2016 was analyzed. A total of 1368 outbreaks of IBD occurred during this period with overall morbidity, mortality and case fatality rate of 4.19%, 2.61% and 62.34% respectively. The disease was recorded throughout the year with maximum outbreaks in August month and in quarter July to September. Out of 1368 IBD outbreaks, maximum number of 734 (53.7%) IBD outbreaks were reported in 21-30 days of age followed by 349 (25.5%) in 11-20 days of age, 259 (18.9%) in 31-40 days of age and 26 (1.9%) outbreaks in 41-50 days of age. This indicates an increase in number of IBD outbreaks in 11-20 days of age cases as compared to earlier reports. Out of total IBD outbreaks, 918 were recorded in vaccinated flocks while 450 were in unvaccinated flocks. The case fatality rate was higher in unvaccinated flocks. Concurrent diseases were recorded in 627 IBD affected flocks. Pneumonia, coccidiosis, respiratory disease complex (RDC), E. coli infection, mycotoxicosis, Ranikhet disease and heat stroke were the major concurrent diseases. Improper immunization schedule, unhygienic conditions on the farm, emergence of newer strains of IBD virus, interference or absence of maternal antibodies could be the reasons for disease in vaccinated flocks. Continuous study may help in better understanding of infectious bursal disease in broiler chickens in this region.
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