The demand for animal protein for human consumption has been risen exponentially. Modern animal production practices are associated with the regular use of antibiotics, potentially increasing the emerging multi-resistant bacteria, which may have a negative impact on public health. In poultry production, substances capable of maximizing the animals' performance and displaying an antimicrobial activity against pathogens are very well desirable features. Probiotic can be an efficient solution for such a task. In the present work, lactic acid bacteria (LAB) were isolated from chicken cecum and screened for their antagonistic effect towards many pathogens. Their capacity of producing the B-complex vitamins folate and riboflavin were also evaluated. From 314 isolates, three (C43, C175 and C195) produced Bacteriocin-Like Inhibitory Substances (BLIS) against Staphylococcus aureus (inhibition zones of 18.9, 21.5, 19.5 mm, respectively) and also inhibited the growth of Salmonella Heidelberg. The isolate C43 was identified as Enterococcus faecium, while C173 and C195 were both identified as Lactococcus lactis subsp. lactis. Moreover, the isolates L. lactis subsp. lactis strains C173 and C195 demonstrated high potential to be used as probiotic in poultry feed, in addition to their advantage of producing folate (58.0 and 595.5 ng/mL, respectively) and riboflavin (223.3 and 175.0 ng/mL, respectively).

译文

人类消费对动物蛋白的需求呈指数级增长。现代动物生产实践与经常使用抗生素有关,有可能增加新兴的多重耐药细菌,这可能对公共健康产生负面影响。在家禽生产中,能够使动物的性能最大化并对病原体表现出抗菌活性的物质是非常理想的特征。益生菌可以是完成此类任务的有效解决方案。在目前的工作中,从鸡盲肠中分离出乳酸菌 (LAB),并筛选了它们对许多病原体的拮抗作用。还评估了它们生产B复合维生素叶酸和核黄素的能力。从314分离株中,三种 (C43,C175和C195) 产生了对金黄色葡萄球菌 (抑制区分别为18.9,21.5,19.5  mm) 的细菌素样抑制物质 (bis),并抑制了海德堡沙门氏菌的生长。分离株C43被鉴定为屎肠球菌,而C173和C195均被鉴定为乳酸乳球菌亚种。此外,分离株乳酸杆菌亚种。乳酸杆菌菌株C173和C195除了具有生产叶酸 (分别为58.0和595.5  ng/mL) 和核黄素 (分别为223.3和175.0  ng/mL) 的优势外,还具有用作家禽饲料中的益生菌的潜力。

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