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首页> 外文期刊>Animal Feed Science and Technology >Effect of banana flower powder supplementation as a rumen buffer on rumen fermentation efficiency and nutrient digestibility in dairy steers fed a high-concentrate diet
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Effect of banana flower powder supplementation as a rumen buffer on rumen fermentation efficiency and nutrient digestibility in dairy steers fed a high-concentrate diet

机译：添加香蕉花粉作为瘤胃缓冲剂对高浓度日粮乳牛瘤胃发酵效率和养分消化率的影响

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摘要

Four rumen-fistulated dairy steers, two and a half year old with liveweight of 220 +/- 15.0 kg, were randomly assigned according to a 4 x 4 Latin square design to study the effect of banana flower powder (BAFLOP) supplementation as a rumen buffering agent on ruminal pH, nutrient digestibility and rumen fermentation fed a high-concentrate diet. The four dietary treatments were BAFLOP supplementation at 0, 10, 20 and 30 g/kg of dry matter intake (DMI), respectively. During the experimental periods, all steers were fed a diet containing roughage to concentrate ratio of 30:70 at 20 g DMI/kg of body weight and rice straw was used as a roughage source. Based on the present study, the results revealed that dry matter, organic matter and crude protein digestibilities were not affected (P>0.05) by BAFLOP supplementation, whereas digestibilities of neutral detergent fiber and acid detergent fiber increased with the increasing levels of BAFLOP supplementation (P<0.05). It was also found that total nitrogen (N) intakes were similar among treatments. However, fecal N excretions decreased with the increasing levels of BAFLOP supplementation, while urinary N excretions were similar among treatments. BAFLOP supplementation increased N balance both absorption and retention (P<0.05). Moreover, purine derivative absorption and microbial protein synthesis were increased by BAFLOP supplementation, whereas efficiency of microbial nitrogen supply (EMNS) and microbial nitrogen supply were similar among treatments. In addition, ruminal temperature, ammonia nitrogen, and blood urea nitrogen were not influenced by BAFLOP supplementation, whilst ruminal pH enhanced (P<0.05) in steers supplemented with BAFLOP at 20 and 30 g/kg of DMI. The concentration of total volatile fatty acid and acetic acid increased with BAFLOP supplementation, whereas propionic and butyric acid remained the same. The present findings showed that BAFLOP supplementation enhanced total bacterial, protozoal, and cellulolytic bacterial growth, while numbers of fungal zoospores, amylolytic and proteolytic bacteria were similar among treatments. In conclusion, BAFLOP supplementation improved rumen ecology and nutrient digestibility by enhancing ruminal pH, nitrogen utilization, EMNS and ruminal microbial population. This study suggested that BAFLOP could be supplemented as a rumen buffering agent at 20-30 g/kg of DMI. (C) 2014 Elsevier B.V. All rights reserved.
机译：根据4 x 4拉丁方形设计，随机分配了四只瘤胃old牛，年龄不超过2岁半，体重为220 +/- 15.0 kg，以研究香蕉花粉（BAFLOP）补充瘤胃的效果缓冲剂对瘤胃的pH，营养物质的消化率和瘤胃发酵的影响是高浓度饮食。四种饮食疗法分别以0、10、20和30 g / kg干物质摄入量（DMI）补充BAFLOP。在实验期间，所有ste牛均饲喂含有粗饲料的饲料，浓缩比为30:70（每公斤体重20 g DMI），稻草用作粗饲料来源。根据目前的研究结果，添加BAFLOP不会影响干物质，有机物和粗蛋白的消化率（P> 0.05），而中性洗涤剂纤维和酸性洗涤剂纤维的消化率会随着BAFLOP含量的增加而增加（ P ＜0.05）。还发现治疗之间的总氮摄入量相似。然而，随着补充BAFLOP水平的增加，粪便N排泄物减少，而各治疗之间的尿N排泄物相似。补充BAFLOP可以增加氮的吸收和保留（P <0.05）。此外，补充BAFLOP可提高嘌呤衍生物的吸收和微生物蛋白的合成，而各处理之间的微生物氮供应（EMNS）和微生物氮供应效率相似。此外，补充BAFLOP不会影响瘤胃温度，氨氮和血液尿素氮，而补充BAFLOP的公牛在DMI 20和30 g / kg时瘤胃pH值升高（P <0.05）。随着BAFLOP的添加，总挥发性脂肪酸和乙酸的浓度增加，而丙酸和丁酸保持不变。本研究结果表明，BAFLOP补充剂可增强细菌，原生动物和纤维素分解细菌的总生长，而真菌游动孢子，淀粉分解和蛋白水解细菌的数量在处理之间相似。总之，补充BAFLOP可通过提高瘤胃pH，氮利用率，EMNS和瘤胃微生物数量来改善瘤胃生态和养分消化率。这项研究表明，BAFLOP可以以20-30 g / kg DMI补充作为瘤胃缓冲剂。 （C）2014 Elsevier B.V.保留所有权利。

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