ABSTRACT The experiment aimed to investigate the effects of probiotic (Bacillus subtilis KMP-BCP-1 and Bacillus licheniformis KMP-9) supplementation on growth performance, ileal digestibility, jejunal histomorphology, colonic ammonia-nitrogen (NH3-N) and blood parameters in broiler chickens. A total of 288, one-day-old female Ross-308 broilers were randomly allotted into 4 treatments with 6 replicates of 12 birds. Treatments were (T1) basal diet (BD), (T2) BD with 200 ppm amoxicillin, (T3) and (T4) BD with probiotics at the levels of 2.5 × 107 and 5.0 × 107 cfu/kg feed, respectively. Supplementation of amoxicillin or probiotics improved (P < 0.05) average daily gain (ADG) and feed conversion ratio (FCR) on d 42. Compared to those fed with T1, broilers fed with T4 increased (P < 0.05) the ratio of jejunal villus height to crypt depth, and improved (P < 0.05) ileal digestibility of dry matter and protein. They also had the highest numbers of lactic acid bacteria (LAB) and Bacillus spp. as well as the ratio of LAB to Escherichia coli (P < 0.05). Probiotics at the level of 5.0 × 107 cfu/kg feed improved the growth performance of broilers in a tropical region by enhancing the balance of caecal bacteria, jejunal histomorphology and ileal digestibility.

中文翻译：

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热带地区日粮益生菌（枯草芽孢杆菌 KMP-BCP-1 和地衣芽孢杆菌 KMP-9）补充及其对肉鸡影响的评价

摘要 本实验旨在研究益生菌（枯草芽孢杆菌 KMP-BCP-1 和地衣芽孢杆菌 KMP-9）对肉鸡生长性能、回肠消化率、空肠组织形态学、结肠氨氮 (NH3-N) 和血液参数的影响。鸡。总共 288 只 1 日龄雌性 Ross-308 肉鸡被随机分配到 4 个处理中，每组 12 只鸡 6 个重复。处理分别为 (T1) 基础日粮 (BD)、(T2) BD 含 200 ppm 阿莫西林，(T3) 和 (T4) BD 含益生菌水平分别为 2.5 × 107 和 5.0 × 107 cfu/kg 饲料。添加阿莫西林或益生菌可改善 (P < 0.05) 第 42 天的平均日增重 (ADG) 和饲料转化率 (FCR)。与饲喂 T1 的肉鸡相比，饲喂 T4 的肉鸡增加了 (P < 0.05) 空肠绒毛比率高度到隐窝深度，并提高（P < 0.05）干物质和蛋白质的回肠消化率。它们的乳酸菌 (LAB) 和芽孢杆菌属数量也最多。以及乳酸菌与大肠杆菌的比例（P < 0.05）。5.0 × 107 cfu/kg 饲料水平的益生菌通过增强盲肠细菌、空肠组织形态学和回肠消化率的平衡，改善了热带地区肉鸡的生长性能。