The levels of infectious bursal disease virus antibodies and histopathology of bursa of Fabricius in broilers
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Abstract
The present study aimed to investigate the antibody titers to infectious bursal disease and histopathology of the bursa of Fabricius in broilers on field trips. A total of 225 Ross 308 chickens were randomly selected from ten farms with different diets and medical care programs. Birds were sacrificed at 1, 7, 14 and 28 days old to determine the bursa/body weight ratio. Bursal tissues were fixed in 10% buffered formalin and used to evaluate bursa histological properties. Blood samples were analyzed by ELISA for the presence of antibody against infectious bursal disease (IBD) virus. Results showed that all birds had protective antibody titers against IBDV from 1 to 14 days old, except birds at day 14 of farms 3 and 5 (245.6 and 342.2, respectively). Likewise, no birds in this study were protective antibody titers against IBDV on day 28, except farms 6 and 10 (821.8 ± 452.2 and 425.1 ± 229.4, respectively). In the present study, the bursa weights of broilers gradually increased from 1 to 28 days old. At 28 days of age, the lowest bursa weight and bursa index were 1.61 g and 0.12%, respectively, while the highest ones were 2.70 g and 0.21%, respectively. The histopathological score of the bursa was not significantly different across all farms. In general, antibody titers against IBD and histopathological score of the bursa do not appear to be affected by dietary supplementation in broiler chickens under various husbandry practices examined in this study, therefore, it is difficult to explain whether feed supplementation on broiler farms can boost antibodies to IBD disease.
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References
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