Sun Ling, Lee Mingyung, Jeon Seoyoung, Seo Seongwon
Division of Animal and Dairy Sciences, Chungnam National University, Daejeon 305-764, Korea.
Animals (Basel). 2020 Feb 18;10(2):325. doi: 10.3390/ani10020325.
The objective of this study was to evaluate the associative effects of rice straw with timothy hay and corn grain. Using an automated gas production system, in vitro ruminal fermentation was studied for six substrates: 100% rice straw, 100% timothy hay, 100% corn grain, 50% rice straw and 50% timothy hay, 50% rice straw and 50% corn grain, and 50% rice straw, 25% timothy hay, and 25% corn grain. Incubation was performed in three batches with different rumen fluids to assess the in vitro ruminal gas production kinetics and rumen parameters (pH, NH-N, volatile fatty acid (VFA), and true dry matter digestibility (TDMD)). The associated effects were tested by comparing the observed values of the composited feeds and the weighted means of individual feeds. There was a significant increase in NH-N when rice straw was fermented with timothy hay, corn grain, or both (p < 0.05). TDMD increased when corn grain was co-fermented, and the total gas and VFA production increased when all three feeds were co-fermented. We conclude that the feed value of rice straw increases when fed to animals along with timothy hay and corn grain.
本研究的目的是评估稻草与梯牧草和玉米籽粒的组合效应。使用自动产气系统，对六种底物进行体外瘤胃发酵研究：100%稻草、100%梯牧草、100%玉米籽粒、50%稻草和50%梯牧草、50%稻草和50%玉米籽粒，以及50%稻草、25%梯牧草和25%玉米籽粒。使用不同的瘤胃液分三批进行培养，以评估体外瘤胃产气动力学和瘤胃参数（pH值、氨氮、挥发性脂肪酸（VFA）和真干物质消化率（TDMD））。通过比较复合饲料的观测值和单一饲料的加权平均值来测试组合效应。当稻草与梯牧草、玉米籽粒或两者一起发酵时，氨氮显著增加（p<0.05）。当玉米籽粒共同发酵时，TDMD增加，当三种饲料共同发酵时，总气体和VFA产量增加。我们得出结论，当与梯牧草和玉米籽粒一起喂给动物时，稻草的饲料价值会提高。
