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Natural resistance of Sri Lankan village chicken to Salmonella gallinarum infection
- Weerasooriya, K. M. S. G., Fernando, P. S., Liyanagunawardena, N., Wijewardena, G., Wijemuni, M. I., Samarakoon, S. A. T. C.
- British poultry science 2017 v.58 no.6 pp. 644-648
- Salmonella Gallinarum, agglutination tests, antibodies, body weight, breeds, chickens, enzyme-linked immunosorbent assay, feed conversion, feed intake, growth performance, mortality, signs and symptoms (animals and humans), villages
- 1. An experiment was conducted to compare the natural resistance of an indigenous breed of local village chickens to Salmonella gallinarum with two commercial breeds: ISA Brown and ISA White layers under experimental conditions. 2. A total of 72 chickens from each of these breeds were randomly distributed to 4 pens to provide equal numbers of two replicate pens maintained as infected and control (uninfected). All chickens in infected groups were inoculated orally with 1 × 10⁸ CFU (1 ml dose) of a field isolate of S. gallinarum, at the age of 8 and 16 weeks given over 5 consecutive days. Growth performance, clinical signs, gross pathological lesions and antibody responses were measured. 3. A significantly higher mortality was observed in the brown layers compared with the white layers, and clinical signs and mortality were absent in village chickens. However, a large number of birds with gross lesions and high antibody titres were detected in village chickens, indicating that birds had the disease subclinically. Commercial breeds had a significantly higher body weight, feed intake and feed conversion efficiency. 4. There was a significantly lower proportion of positive reactors in village chickens in the whole-blood agglutination test (35%) compared to brown (100%) and white (90%) layers even after the second inoculation. Uninfected birds were negative in all groups. The indirect enzyme-linked immunosorbent assay confirmed these observations. 5. These results suggest that the indigenous breed had superior natural resistance to S. gallinarum than the commercial breeds.