Enteric methane (CH 4 ) emission from ruminant livestock is one of the main sources of greenhouse gases from the agricultural sector worldwide. In tropical regions there is a wide variety of forage species that have the capacity to improve cattle diets and reduce enteric CH 4 emissions. A screening trial was conducted to investigate the nutrient and phytochemical composition, total gas and CH 4 production of fifteen tropical multipurpose forage species from Southern Mexico. The content of crude protein (CP), neutral detergent fiber (NDF) and gross energy fluctuated among species, from 99.07 to 264.4, from 275.19 to 614.35 g kg −1 dry matter (DM) and from 15.65 to 20.92 MJ kg −1 DM. In vitro digestibility of DM (IVDDM) was lower for the species containing condensed tannins (CT) and fluctuated between 447.44 and 709.94 g kg −1 DM. Bursera simaruba showed the lowest CH 4 production (9.077 mg g −1 degraded organic matter) with a CT content of 200 g kg −1 DM. Results suggest that several plant species widely available in Southern Mexico present high potential for mitigating enteric CH 4 production and have a high nutritional quality. These species are suitable as additive or supplementary feed to improve diet quality and reduce CH 4 emissions in cattle raised under grazing conditions in the tropical regions of the world.

中文翻译：

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墨西哥南部牧草的肠道甲烷缓解和发酵动力学：体外筛选

来自反刍家畜的肠道甲烷 (CH 4 ) 排放是全球农业部门温室气体的主要来源之一。在热带地区，有多种牧草品种能够改善牛的饮食并减少肠道 CH 4 排放。进行了一项筛选试验，以调查来自墨西哥南部的 15 种热带多用途牧草的营养成分和植物化学成分、总气体和 CH 4 产量。粗蛋白（CP）、中性洗涤纤维（NDF）和总能量的含量在物种之间波动，从 99.07 到 264.4，从 275.19 到 614.35 g kg -1 干物质（DM）和从 15.65 到 20.92 MJ kg -1 DM . DM (IVDDM) 的体外消化率对于含有缩合单宁 (CT) 的物种来说较低，并且在 447.44 和 709.94 g kg -1 DM 之间波动。Bursera simaruba 显示最低的 CH 4 产量（9.077 mg g -1 降解的有机物质），CT 含量为 200 g kg -1 DM。结果表明，在墨西哥南部广泛使用的几种植物物种在减少肠道 CH 4 产生方面具有很高的潜力，并且具有很高的营养质量。这些物种适合作为添加剂或补充饲料，以改善世界热带地区放牧条件下饲养的牛的饮食质量并减少 CH 4 排放。