• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of integrative Environmental Sciences >Swiss diet types for cattle: how accurately are they reflected by the Intergovernmental Panel on Climate Change default values?
【24h】

Swiss diet types for cattle: how accurately are they reflected by the Intergovernmental Panel on Climate Change default values?

机译：瑞士牛的饮食类型：政府间气候变化专门委员会的默认值对它们的准确性如何？

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In Switzerland, a considerable part of the country is mountainous. Forage-based diets dominate, as crop production and feed import are limited. Long winter periods require large amounts of conserved feeds. This results in diet types where the current Intergovernmental Panel on Climate Change (IPCC) default values for enteric and manure-derived methane may not be fully appropriate. In 10 experiments carried out in Switzerland, methane emission data were obtained from various forage-based diet types. This included enteric (open-circuit respiratory chambers) and manure-derived methane (various techniques). In dairy cows and suckler cow-calf pairs, the methane-conversion rate (Y_m, methane energy, % of gross energy intake) was 7.1% (5.9-8.0) and 8.1% (7.8-8.5), respectively (IPCC default value: 6.5%). In fattening bulls, Y_m increased from 4.5% to 5.4% during fattening (default: 6.5%). In the slurry of fattening bulls and dairy cows, the methane-conversion factor (% of maximum slurry-methane emission potential realised) was 0.9% and 5.3% on average when incubated at 14 and 27°C (means of 7 and 14 weeks storage), respectively (default: 15% and 48%). Accordingly, IPCC default values overestimate enteric methane emissions of Swiss forage-based fattening bulls and underestimate those of suckler beef cow-calf pairs. For dairy cows, Y_m remained within the current uncertainty range given by IPCC.
机译：在瑞士，该国的相当一部分是山区。饲料为主的饲料为基础的饲料，因为作物产量和饲料进口受到限制。冬季漫长，需要大量保存饲料。这导致了饮食类型的出现，其中目前政府间气候变化专门委员会（IPCC）的肠道和粪便衍生甲烷默认值可能不完全合适。在瑞士进行的10个实验中，甲烷排放数据是从各种以饲料为基础的日粮类型中获得的。这包括肠溶（开路呼吸腔）和粪便衍生的甲烷（各种技术）。在奶牛和奶牛犊牛对中，甲烷转化率（Y_m，甲烷能量，占总能量摄入的百分比）分别为7.1％（5.9-8.0）和8.1％（7.8-8.5）（IPCC默认值： 6.5％）。在育肥的公牛中，育肥期间的Y_m从4.5％增加到5.4％（默认值：6.5％）。在育肥的公牛和奶牛的粪便中，在14和27°C下保温时，甲烷转化因子（已实现的最大粪便甲烷排放潜力的百分比）平均为0.9％和5.3％（平均储存7和14周） ）（默认值：15％和48％）。因此，IPCC的默认值高估了瑞士以饲草为基础的育肥公牛的肠甲烷排放量，而低估了奶牛-犊牛对的肠甲烷排放量。对于奶牛，Y_m保持在IPCC提供的当前不确定性范围内。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号