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Effect of Bacillus cereus var. Toyoi and Saccharomyces boulardii on the immune response of sheep to vaccines

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In this study we evaluated the effects of Bacillus cereus var. Toyoi and Saccharomyces boulardii on the immune response of lambs to Escherichia coli K88ab and Bovine Herpes Virus type 5 (BoHV-5) vaccines. Thirty, 3-month-old lambs were randomly grouped in three lots of 10 each and vaccinated at days 0 and 30 of the experiment. They grazed on the same pasture and were fed ad libitum twice a day with commercial sheep feed supplemented with either B. cereus var. Toyoi at a concentration of 1×106 viable spores gr-1, S. boulardii at a concentration of 1×106 CFU gr-1, or non-supplemented feed. Blood samples were collected at weekly intervals over eight weeks and antibody titres were analysed by ELISA. The mean seroconversions against E. coli and BoHV-5 of the fed probiotics groups were higher (p<0.001) than the controls. Both probiotics enhanced the humoral immune response of lambs to the vaccines.
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Keywords: immunomodulation; probiotics; ruminants

Document Type: Research Article

Affiliations: 1: Faculdade de Veterinaria, Universidade Federal de Pelotas, Pelotas, Brazil 2: Centro de Biotecnologia, Universidade Federal de Pelotas, Pelotas, Brazil 3: Instituto de Biologia, Universidade Federal de Pelotas, Pelotas, Brazil

Publication date: June 1, 2010

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