摘要
Enteric methane emission is not only a source of energy loss in ruminants, but also a potent contributor to greenhouse gas production. To identify the nature and timing of interventions to reduce methane emissions requires knowledge of temporal kinetics of methane emissions during animal husbandry. Accordingly, a mathematical model was developed to investigate the pattern of enteric methane emissions after feeding in dairy cows. The model facilitated estimation of total enteric methane emissions (V, g) produced by the residual substrate (V1, g) and newly ingested feed (V2, g). The model was fitted to the 10 h methane emission patterns after morning feeding of 16 non-lactating dairy cows with various body weights (BW), and the obtained parameters were used to predict the kinetics of 24 h methane emission for each animal. The rate of methane emission (g/h) reached a maximum within 1 to 2 h after feeding, followed by a gradual post-prandial decline to a basal value before the next feeding. The model satisfactorily fitted curves for each cow according to the criterion of goodness-of-fit, and provided biological descriptions for fluctuations in methane emissions based on basal V1 and feeding V2 in response to the changes in BW and dry matter intake (DMI) of different dairy cows. The basal V1 and feeding V2 are probably maintained by slow- and readily-degradable substrates, respectively. The former contributed at least 0.6 of methane production. In summary, the model provides a means to separate basal V1 and feeding V2 within V, and can be used to predict 24 h emission from a single feeding period.
摘要译文
肠道甲烷排放不仅是反刍动物能量损失的来源，也是温室气体生产的有力贡献者为了确定减少甲烷排放的干预措施的性质和时间，需要了解畜牧业甲烷排放的时间动力学。因此，开发了一种数学模型来研究奶牛喂养后肠道甲烷排放的模式。该模型有助于估计总肠道甲烷排放（V，g）由残留基材（V 1，g）和新摄取的进料（V 2，g））产生该模型适用于16种不同体重（BW）的非泌乳奶牛早晨喂养后的10 h甲烷排放模式，得到的参数用于预测每只动物24 h甲烷排放的动力学。进食后1〜2 h内甲烷排放率（g / h）达到最大值，其次是在下一次喂养之前逐渐下降到基础值。模型根据拟合优度标准满足每只母牛的曲线拟合曲线，并提供了基于基础V 1和喂养V 2的甲烷排放波动的生物学描述，以响应不同奶牛的BW和干物质摄入量（DMI）的变化基础V 1和饲料V 2可能分别由缓慢且易降解的底物维持，前者贡献了至少0 m的甲烷生产。总之，该模型提供了将基础V 1和V 2分配到V内的手段，可用于预测单次喂养期间的24 h排放量
Min Wang[a]; Rong Wang[a]; Xuezhao Sun[b]; Liang Chen[a]; Shaoxun Tang[a]; Chuangshe Zhou[a]; Xuefeng Han[a]; Jinghe Kang[a]; Zhiliang Tan[a]; Zhixiong He[a]. A mathematical model to describe the diurnal pattern of enteric methane emissions from non-lactating dairy cows post-feeding[J]. Animal Nutrition, 2015,1(4): 329–338