Effects of dietary lactose and the cecal anaerobic microflora on the colonization of Salmonella enterica serovar gallinarum biovar gallinarum in broiler chicks
1997
Shawabkeh, K. (Jordan Univ., Amman (Jordan). Dept. of Animal Production, Faculty of Agriculture)
The effect of dietary lactose and the cecal anaerobic microflora on the cecal colonization of Salmonella enterica serovar gallinarum biovar gallinarum was evaluated in broiler chicks. Two hundred and eighty eight day old broiler chicks were divided into eight groups as each had three replicates of 12 chicks; the groups provided, (1) no anaerobic cultures, no lactose in diet (controls); (2) 2.5% lactose; (3) 5% lactose; (4) 7.5% lactose; (5) anaerobic cultures, no lactose; (6) 2.5% lactose and anaerobic cultures; (7) 5% lactose and anaerobic cultures; (8) 7.5% lactose and anaerobic cultures. All groups were challenged orally with 10**6 cfu S. enterica serovar gallinarum biovar gallinarumm at three days of age. At 7, 14 and 21 days of age the cecal contents of 4 chicks in each group were evaluated for cecal pH and Salmonella colonization. The chicks provided with anaerobic cultures and lactose had significantly (P 0.05) fewer S. per gram of cecal contents than the controls. The mean Log 10 number of S. per gram of cecal contents and the numbers of secal-culture positive chicks, were similarly significantly (P 0.05), decreased in treatment groups provided with 7.5% dietary lactose and the groups inoculated with anaerobic flora, plus dietary lactose. The pH of the ceca of the groups provided with lactose decreased significantly (P 0.01). Results showed that providing dietary lactose to the feed of broiler chicks and inoculation with anaerobic flora, decreased cecal pH and inhibited cecal colonization of Salmonella gallinarum biovar gallinarum.
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