摘要
Four rumen-fistulated crossbred beef cattle (Brahman native) were randomly assigned according to a Latin square design experiment to be fed plant herb supplements in their concentrate mixture. The treatments were: without herb supplementation (Control), lemongrass meal supplementation at 100 g/d (L), lemongrass meal supplementation at 100 g/d plus peppermint powder at 10 g/d (LP), and lemongrass meal supplementation at 100 g/d plus peppermint powder at 10 g/d with garlic powder 40 g/d (LPG), respectively. Based on the present study, the DMI and apparent digestibility of DM, OM, aNDF and ADF were not affected by dietary herb supplementation while CP digestibility tended to be decreased by herb supplement. Moreover, -N and BUN were decreased in all herb supplemented treatments and there was a tendency to an increase in ruminal pH in all herb supplemented groups. While there was no change in TVFA and C4 among lemongrass treatments, C2 was decreased in all herb supplemented treatments while C3 was increased. Methane production by calculation was the lowest in the LP and LPG groups. Population sizes of bacteria and protozoa were decreased in all herb supplemented groups, but not fungal zoospores. In all supplemented groups, total viable and proteolytic bacteria were decreased, while amylolytic and cellulolytic bacteria were similar. More importantly, in all herb supplemented groups, there were higher N balances, while there was no difference among treatments on purine derivative (PD) excretion or microbial N. Based on the results above, it could be concluded that there was no negative effect on ruminal fermentation characteristics and nutrient utilization by plant herb supplement, but protozoal population and production were reduced. Thus, lemongrass alone or in combination with peppermint and garlic powder could be used as feed additives to improve rumen fermentation efficiency.
摘要译文
根据拉丁方设计实验随机分配四只瘤胃瘘的杂交肉牛（婆罗门本地人），在其浓缩物混合物中饲喂植物草药补充剂。处理为：不添加草药（对照），100g / d（L）的柠檬草粉补充，100g / d的柠檬草粉补充加10g / d的薄荷粉（LP），和100g / d的柠檬草粉加上10g / d的薄荷粉和大蒜粉40g / d（LPG）。根据目前的研究，DM，OM的DMI和表观消化率，膳食草药补充剂不影响aNDF和ADF，而草药补充剂则CP消化率降低。此外，在所有草药补充处理中-N和BUN均降低，并且在所有草药补充组中存在瘤胃pH增加的趋势。虽然在柠檬草处理中TVFA和C4没有变化，但在所有草药补充处理中C2降低，而C3增加。通过计算得到的甲烷产量在LP和LPG组中最低。在所有草药补充组中细菌和原生动物的种群大小减少，但不是真菌游动孢子。在所有补充组中，总活力和蛋白水解细菌减少，而淀粉分解和纤维素分解细菌相似。更重要的是，在所有草药补充组中，有较高的N平衡，而嘌呤衍生物（PD）排泄或微生物N的处理没有差异。根据上述结果，可以得出结论，植物补充剂对瘤胃发酵特性和养分利用没有负面影响，但原生动物种群和产量减少了。从而，柠檬草单独或与薄荷和大蒜粉结合使用可作为饲料添加剂，以提高瘤胃发酵效率。
Wanapat, M.; Kang, S.; Khejornsart, P.; Wanapat, S.;. Effects of Plant Herb Combination Supplementation on Rumen Fermentation and Nutrient Digestibility in Beef Cattle[J]. Asian-Australasian Journal of Animal Sciences, 2013,26(8): 1127-1136