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Estimation of enteric methane emission factors for Ndama cattle in the Sudanian zone of Senegal

机译：塞内加尔苏丹牛肠道牛粪排放因子的估算

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摘要

Methane (CH4) emission estimations for cattle in Sub-Saharan Africa (SSA) reflect limited production levels and diets that are high in cellulose forage. However, data on these livestock systems is lacking for their accurate evaluation. To provide guidance for climate change mitigation strategies in Senegal, it is necessary to obtain reliable estimates of CH4 emissions from Ndama cattle reared in grazing systems, which is the predominant cattle system in the country. The objective of this study was to determine the annual methane emission factor (MEF) for enteric fermentation of Ndama cattle following the IPCC Tier 2 procedure. Our estimated annual MEF at the herd scale was 30.8 kg CH4/TLU (30.7 kg CH4/head/yr for lactating cows and 15.1 kg CH4/head/yr for other cattle). These values are well below the default IPCC emission factor (46 and 31 kg CH4/head/yr for dairy and other cattle, respectively) proposed in the Tier 1 method for Africa. Our study showed that feed digestibility values differ with season (from 46 to 64%). We also showed that cattle lose weight and adapt to lower feed requirements during the long dry season, with a resulting major reduction in methane emissions. The results of this work provide a new framework to re-estimate the contribution of grazing systems to methane emissions in Africa.
机译：甲烷（CH4）牛撒哈拉以南非洲（SSA）的排放估计反映了纤维素饲料中高的生产水平和饮食。但是，对这些牲畜系统的数据缺乏准确的评估。为了为塞内加尔提供气候变化缓解策略的指导，有必要获得从放牧系统饲养的Ndama牛的CH4排放的可靠估计，这是该国的主要牛系统。本研究的目的是确定IPCC第2层程序后NDAMA牛肠道发酵的年度甲烷排放因子（MEF）。我们在牛群中的估计年度MEF是30.8公斤CH4 / TLU（30.7公斤CH4 / HEAD / YR用于哺乳奶牛，其他牛的15.1公斤CH4 / HEAD / YR）。这些值远低于默认的IPCC排放因子（分别为乳制品和其他牛的46和31公斤CH4 / HEAD / YR），用于非洲的1种方法。我们的研究表明，饲料消化率值不同于季节（从46到64％）。我们还表明，牛减肥，适应长旱季期间的饲料需求降低，导致甲烷排放的主要减少。这项工作的结果提供了一个新的框架，可以重新估算放牧系统对非洲甲烷排放的贡献。

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