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《Journal of Anhui Agricultural Sciences》 2008-08
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Effect of Lactobacillus delbrueckii subsp.delbrueckii on the Micro Flora in Broiler Gut

XU Zhi-sen (Department of Biology,Dezhou University,Dezhou,Shandong 253023)  
[Objective] The aim was to explore the influences of Lactobacillus delbrueckii subsp.delbrueckii on the micro flora in broiler gut. [Method] Experimental lactic acid bacteria (LAB) were isolated from intestinal mucous of broiler gut. Forty-five broilers were reared on feed supplement with Lactobacillus delbrueckii subsp.delbrueckii alone and oxytetracycline. After 55 days of feeding,the total numbers of aerobes,Salmonella typhimurium,Staphylococcus aureus and Lactobacillus delbrueckii subsp.delbrueckii were measured by plate colony count. [Result] Six strains were isolated from intestinal mucous of broiler gut. According to their physioloical and biochemical characteristics,3 strains were identified as belonging to the genus of Lactobacills:S2 as Lactobacillus asidophilus,S4 as Lactobacillus delbrueckii subsp.lactic,S6 as Lactobacillus delbrueckii subsp.delbrueckii . Other 3 strains were identified as Enterococcus faecalis. After 30 days administrated with lyophilized bacteria,Lactobacillus asidophilus colonized in the broiler gut with stable number. The number of Salmonella typhimurium reduced because of the inhibitory effect of Lactobacillus delbrueckii subsp.delbrueckii. But it had no effects on aerobes in broiler gut. [Conclusion] The influences of Lactobacillus asidophilus on the micro flora in broiler gut were similar to those of oxytetracycline. It was suggested that LAB additive could be used in broiler farming as substituting for antibiotics.
【Fund】: 德州市科学技术攻关项目(042102)
【CateGory Index】: S831
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