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首页> 外文期刊>Animal Feed Science and Technology >Effects of supplementation of Bacillus subtilis natto Na and N1 strains on rumen development in dairy calves
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Effects of supplementation of Bacillus subtilis natto Na and N1 strains on rumen development in dairy calves

机译：补充枯草芽孢杆菌Na和N1菌株对奶牛瘤胃发育的影响

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Effects of Bacillus subtilis natto Na and N1 strains on ruminal development of papillae in dairy calves were investigated. Twenty four Holstein bull calves (7 +/- 1.1 d) were randomly divided into three treatments of eight calves. The natto cultures Na and N1 were mixed with milk before weaning, or mixed with the concentrate portion of the diets after weaning. All calves were weaned when starter intake reach 20 g/kg of body weight. At weaning four calves were randomly selected from each group and slaughtered, and the remaining calves were fed the basal diet for additional 44d and then slaughtered. Rumen fluid and ventral rumen tissue samples were collected from all calves. Results show that oral supplementation of B. subtilis natto Na or N1 reduced concentrations of short chain fatty acids in the rumen at weaning and 44 d after weaning (P<0.05). B. subtilis natto N1 reduced rumen pH and molar proportion of butyrate in both experimental periods (P<0.05), while B. subtilis natto Na decreased the molar proportion of acetate and ammonia levels at weaning (P<0.05) and depressed rumen NH3 concentration 44d post weaning (P<0.05). The number and surface area of papillae per cm(2) rumen wall for Na and Ni groups tended to be higher than the control at weaning (P<0.10) and 44 d after weaning (P<0.01). Furthermore, rumen papillae were flattened and tongue-shaped without narrow stalks, clumping or parakeratosis in the calves treated with natto culture. This study demonstrates that oral administration of B. subtilis natto Na and Ni increased rate of rumen development in dairy calves
机译：研究了枯草芽孢杆菌纳豆芽孢杆菌Na和N1菌株对小牛乳头瘤胃发育的影响。将二十四只荷斯坦牛犊（7 +/- 1.1 d）随机分为八只犊牛的三种处理。纳豆培养物Na和N1在断奶前与牛奶混合，或在断奶后与饮食中的浓缩部分混合。当初学者的摄入量达到20 g / kg体重时，将所有小牛断奶。在断奶时，从每组中随机选择四头犊牛并进行宰杀，其余的犊牛在基础日粮中再饲喂44天，然后宰杀。从所有小牛收集瘤胃液和腹腔瘤胃组织样品。结果表明，在断奶时和断奶后44 d，口服补充枯草芽孢杆菌的Na或N1可降低瘤胃中短链脂肪酸的浓度（P <0.05）。在两个实验期间，纳豆芽孢杆菌N1均降低瘤胃pH和丁酸摩尔比（P <0.05），而断奶时纳豆芽孢杆菌Na可降低乙酸和氨水平的摩尔比（P <0.05）并降低瘤胃NH3浓度断奶后44d（P <0.05）。 Na和Ni组每cm（2）瘤胃壁的乳头数量和表面积往往比断奶时的对照组（P <0.10）和断奶后44 d（P <0.01）高。此外，在用纳豆培养物处理的小牛中，瘤胃乳头变平且呈舌状，没有狭窄的茎，结块或角化不全。这项研究表明，口服枯草芽孢杆菌纳豆钠和镍可增加乳牛犊瘤胃发育的速度

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