Matra Maharach, Wanapat Metha, Cherdthong Anusorn, Foiklang Suban, Mapato Chaowarit
Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002, Thailand.
Faculty of Animal Science and Technology, Maejo University, Chiangmai, 50290, Thailand.
Trop Anim Health Prod. 2019 Jul;51(6):1531-1538. doi: 10.1007/s11250-019-01844-y. Epub 2019 Apr 8.
Plant phytophenols especially condensed tannins (CT) and saponins (SP) have been demonstrated to impact on rumen fermentation. Dragon fruit (Hylocereus undatus) peel powder (DFPP) contains both CT and SP. The current study aimed to investigate the influence of DFPP and varying levels of concentrate and roughage ratios on gas production kinetics, nutrient degradability, and methane production "using in vitro gas production technique." The dietary treatments were arranged according to a 3 × 5 Factorial arrangement in a completely randomized design. The two experimental factors consisted of the roughage to concentrate (R:C) ratio (100:0, 70:30, and 30:70) and the levels of DFPP supplementation (0, 1, 2, 3, and 4% of the substrate) on DM basis. The results revealed that the R:C ratio at 30:70 had the highest cumulative gas production when compared to other ratios (P < 0.01). The in vitro true dry matter degradability at 12 and 24 h was affected by R:C ratio (P < 0.01). Furthermore, volatile fatty acids (VFA) and propionate (C3) were significantly increased by the levels of DFPP, while acetate (C2) and C2:C3 ratios were decreased (P < 0.05). The rumen protozoal population was significantly decreased by DFPP supplementation (P < 0.05). Rumen methane production was significantly impacted by R:C ratios and decreased when the level of DFPP increased (P < 0.01), while NH-N and ruminal pH were not influenced by the DFPP supplement. It could be summarized that supplementation of DFPP resulted in improved rumen fermentation kinetics and could be used as a dietary source to mitigate rumen methane production, hence reducing greenhouse gas production.
植物多酚，尤其是缩合单宁（CT）和皂苷（SP），已被证明会影响瘤胃发酵。火龙果（Hylocereus undatus）果皮粉（DFPP）同时含有CT和SP。本研究旨在“采用体外产气技术”研究DFPP以及不同水平的精粗比（精饲料与粗饲料之比）对产气动力学、养分降解率和甲烷产生的影响。日粮处理按照3×5析因设计进行完全随机排列。两个实验因素分别为粗饲料与精饲料（R:C）比（100:0、70:30和30:70）以及以干物质为基础的DFPP添加水平（底物的0%、1%、2%、3%和4%）。结果显示，与其他比例相比，30:70的R:C比具有最高的累积产气量（P<0.01）。12小时和24小时的体外真干物质降解率受R:C比的影响（P<0.01）。此外，DFPP水平显著增加了挥发性脂肪酸（VFA）和丙酸（C3）的含量，而乙酸（C2）和C2:C3比值降低（P<0.05）。添加DFPP显著降低了瘤胃原虫数量（P<0.05）。瘤胃甲烷产生量受R:C比的显著影响，且随着DFPP水平的增加而降低（P<0.01），而NH-N和瘤胃pH值不受DFPP添加的影响。可以总结得出，添加DFPP可改善瘤胃发酵动力学，并可作为一种日粮来源来减少瘤胃甲烷产生，从而减少温室气体排放。
