Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; Hunan Co-Innovation Center of Animal Production Safety, Changsha, Hunan 410128, China.
Key Laboratory for Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock and Poultry Sciences, South Central Experimental Station of Animal Nutrition and Feed Science in the Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; Hunan Co-Innovation Center of Animal Production Safety, Changsha, Hunan 410128, China.
J Dairy Sci. 2020 May;103(5):4252-4261. doi: 10.3168/jds.2019-16904. Epub 2020 Mar 5.
Liquid hot water (LHW) treatment can be used to disrupt the fiber structure of rice straw. This in vitro ruminal batch culture study investigated the effect of LHW treatment on feed degradation, methane (CH) production, and microbial populations. Rice straw was treated by LHW, and in vitro ruminal fermentation was performed using an automatic system with 72 h of incubation. Scanning electron microscopy showed that LHW treatment disrupted the physical structure of rice straw. Liquid hot water treatment decreased neutral detergent fiber and hemicellulose contents of the rice straw and increased neutral detergent solubles, water-soluble carbohydrates, and arabinose contents. Liquid hot water treatment increased dry matter degradation and volatile fatty acid concentration and decreased the acetate:propionate ratio, CH production, hydrogen accumulation, neutral detergent fiber degradation, and populations of protozoa, fungi, and cellulolytic bacteria. In summary, LHW treatment disrupted the cellulose-hemicellulose-lignin structure matrix of rice straw, leading to increased substrate degradability and decreased CH production. Therefore, the LHW treatment is a potential strategy to improve the nutritive value of forage such as rice straw and decrease the CH emissions in ruminants.
液态热水（LHW）处理可用于破坏稻草的纤维结构。本体外瘤胃分批培养研究探讨了 LHW 处理对饲料降解、甲烷（CH）产生和微生物种群的影响。用 LHW 处理稻草，并用自动系统进行体外瘤胃发酵，孵育 72 小时。扫描电子显微镜显示，LHW 处理破坏了稻草的物理结构。液态热水处理降低了稻草的中性洗涤剂纤维和半纤维素含量，增加了中性洗涤剂可溶物、水溶性碳水化合物和阿拉伯糖含量。液态热水处理增加了干物质降解和挥发性脂肪酸浓度，降低了乙酸：丙酸比、CH 产生、氢气积累、中性洗涤剂纤维降解以及原生动物、真菌和纤维素分解细菌的数量。总之，LHW 处理破坏了稻草的纤维素-半纤维素-木质素结构基质，导致底物降解性增加和 CH 产生减少。因此，LHW 处理是一种提高稻草等饲料营养价值和减少反刍动物 CH 排放的潜在策略。
