The effect of Bacillus cereus var. toyoi and avilamycin on the faecal microflora of turkeys
E. Biedrzycka 1  
,   M. Bielecka 1,   A. Majkowska 1,   J. Jankowski 2
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Department of Food Microbiology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-747 Olsztyn, Poland
Department of Poultry Science, University of Warmia and Mazury, Oczapowskiego 5, 10-719 Olsztyn, Poland
E. Biedrzycka   

Department of Food Microbiology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-747 Olsztyn, Poland
Publication date: 2003-10-28
J. Anim. Feed Sci. 2003;12(4):821–832
The effect of Bacillus cereus var. toyoi spores and avilamycin as bacterial and antibiotic growth promoters, respectively, on faecal microflora of turkeys was determined. The experiment was carried out on 108 turkeys randomly allocated to 3 groups: control and avilamycin- or Bacillus spore-treated. After 12 weeks of feed supplementation and a subsequent 4-week period following withdrawal, selected groups of faecal microflora were determined, and the results were compared with those in the control group. Neither avilamycin nor B. cereus var. toyoi spores affected Bifidobacterium or Lactobacillus counts, whereas both supplements significantly increased the counts of E. coli by 0.84 and 0.69 log cycle (P ≤ 0.05 for both). B. cereus var. toyoi caused a significant increase in counts of spores of both aerobic and anaerobic proteolytic bacteria by 0.98 (P ≤ 0.001) and 0.83 (P ≤ 0.01) log cycle, respectively. At the end of the period following withdrawal, in the avilamycin group, counts of Bifidobacterium and Lactobacillus significantly decreased by 1.14 (P ≤ 0.01) and 1.97 (P ≤ 0.001) log cycle, respectively, as did the counts of anaerobic proteolytic bacteria spores, which decreased by 1.18 (P ≤ 0.001). In the B. cereus var. toyoi group, however, increased counts of Lactobacillus, by 0.91 (P≤0.01), E. coli, by 0.71 (P ≤ 0.05), anaerobic proteolytic bacteria spores, by 1.37 (P ≤ 0.001), and of anaerobic saccharolytic bacteria spores, by 0.72 (P ≤ 0.05) log cycle were found. The tested growth promoters did not affect the groups of beneficial gut microflora, whereas they stimulated the growth of opportunistic bacteria. The performance parameters of turkeys, better in groups administered avilamycin and B. cereus var. toyoi, were comparable with the control at the end of period after withdrawal.
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