A cross sectional study was conducted on 164120 non-vaccinated layer birds of 96 farms in six upa... more A cross sectional study was conducted on 164120 non-vaccinated layer birds of 96 farms in six upazilas (Sadar, Batiaghata, Dumuria, Dighulia, Rupsha and Fultala) of Khulna district to determine the seroprevalence of Salmonella infection (S. pullorum and S. gallinarum) during the period from August 2009 to July 2010. Sera samples were collected from 1268 layer birds of different ages and the birds were selected through a disproportionate stratified random sampling technique based on the flock size of each farm. Sera samples were tested by Serum plate agglutination (SPA) test applying commercial Salmonella antigen (Nobilis® SA, Intervet International B.V. Boxmeer- Holland) to detect the presence of antibodies against Salmonella. The overall seroprevalence of Salmonella infection was recorded as 65.9%. The significantly higher seroprevalence (76.6%) of Salmonella infection was recorded in layer birds of >56 weeks of age than those of other age groups. Seasons had significant influen...
A cross sectional study was conducted on 164120 non-vaccinated layer birds of 96 farms in six upa... more A cross sectional study was conducted on 164120 non-vaccinated layer birds of 96 farms in six upazilas (Sadar, Batiaghata, Dumuria, Dighulia, Rupsha and Fultala) of Khulna district to determine the seroprevalence of Salmonella infection (S. pullorum and S. gallinarum) during the period from August 2009 to July 2010. Sera samples were collected from 1268 layer birds of different ages and the birds were selected through a disproportionate stratified random sampling technique based on the flock size of each farm. Sera samples were tested by Serum plate agglutination (SPA) test applying commercial Salmonella antigen (Nobilis® SA, Intervet International B.V. Boxmeer- Holland) to detect the presence of antibodies against Salmonella. The overall seroprevalence of Salmonella infection was recorded as 65.9%. The significantly higher seroprevalence (76.6%) of Salmonella infection was recorded in layer birds of >56 weeks of age than those of other age groups. Seasons had significant influen...
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