日粮有机微量元素对热应激期奶牛瘤胃微生物群及肠道甲烷排放的影响
Influence of dietary organic trace minerals on enteric methane emissions and rumen microbiota of heat-stressed dairy steers.
作者信息
Son A-Rang, Islam Mahfuzul, Kim Seon-Ho, Lee Sung-Sill, Lee Sang-Suk
机构信息
Ruminant Nutrition and Anaerobe Laboratory, Department of Animal Science and Technology, Sunchon National University, Suncheon 57922, Korea.
Department of Microbiology and Parasitology, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh.
出版信息
J Anim Sci Technol. 2023 Jan;65(1):132-148. doi: 10.5187/jast.2022.e100. Epub 2023 Jan 31.
Ruminants are the main contributors to methane (CH), a greenhouse gas emitted by livestock, which leads to global warming. In addition, animals experience heat stress (HS) when exposed to high ambient temperatures. Organic trace minerals are commonly used to prevent the adverse effects of HS in ruminants; however, little is known about the role of these minerals in reducing enteric methane emissions. Hence, this study aimed to investigate the influence of dietary organic trace minerals on rumen fermentation characteristics, enteric methane emissions, and the composition of rumen bacteria and methanogens in heat-stressed dairy steers. Holstein (n=3) and Jersey (n=3) steers were kept separately within a 3×3 Latin square design, and the animals were exposed to HS conditions (Temperature-Humidity Index [THI], 82.79 ± 1.10). For each experiment, the treatments included a Control (Con) consisting of only basal total mixed rations (TMR), National Research Council (NRC) recommended mineral supplementation group (NM; TMR + [Se 0.1 ppm + Zn 30 ppm + Cu 10 ppm]/kg dry matter), and higher concentration of mineral supplementation group (HM; basal TMR + [Se 3.5 ppm + Zn 350 ppm + Cu 28 ppm]/kg dry matter). Higher concentrations of trace mineral supplementation had no influence on methane emissions and rumen bacterial and methanogen communities regardless of breed ( > 0.05). Holstein steers had higher ruminal pH and lower total volatile fatty acid (VFA) concentrations than Jersey steers ( < 0.05). Methane production (g/d) and yield (g/kg dry matter intake) were higher in Jersey steers than in Holstein steers ( < 0.05). The relative abundances of and were significantly higher in Holstein steers than in Jersey steers ( < 0.05). Overall, dietary organic trace minerals have no influence on enteric methane emissions in heat-stressed dairy steers; however, breed can influence it through selective alteration of the rumen methanogen community.
反刍动物是甲烷（CH）的主要排放源，甲烷是家畜排放的一种温室气体，会导致全球变暖。此外，动物在暴露于高温环境时会经历热应激（HS）。有机微量元素常用于预防反刍动物热应激的不良影响；然而，关于这些矿物质在减少肠道甲烷排放中的作用知之甚少。因此，本研究旨在调查日粮有机微量元素对热应激奶牛瘤胃发酵特性、肠道甲烷排放以及瘤胃细菌和产甲烷菌组成的影响。荷斯坦（n = 3）和泽西（n = 3）公牛在3×3拉丁方设计中分别饲养，动物暴露于热应激条件下（温度 - 湿度指数[THI]，82.79 ± 1.10）。对于每个实验，处理包括对照组（Con），仅由基础全混合日粮（TMR）组成，美国国家研究委员会（NRC）推荐的矿物质补充组（NM；TMR + [硒0.1 ppm + 锌30 ppm + 铜10 ppm]/千克干物质），以及更高浓度的矿物质补充组（HM；基础TMR + [硒3.5 ppm + 锌350 ppm + 铜28 ppm]/千克干物质）。无论品种如何，较高浓度的微量元素补充对甲烷排放以及瘤胃细菌和产甲烷菌群落均无影响（> 0.05）。荷斯坦公牛的瘤胃pH值高于泽西公牛，总挥发性脂肪酸（VFA）浓度低于泽西公牛（< 0.05）。泽西公牛的甲烷产量（克/天）和产率（克/千克干物质摄入量）高于荷斯坦公牛（< 0.05）。荷斯坦公牛中 和 的相对丰度显著高于泽西公牛（< 0.05）。总体而言，日粮有机微量元素对热应激奶牛的肠道甲烷排放没有影响；然而，品种可以通过选择性改变瘤胃产甲烷菌群落来影响它。
Zotero 插件