Methane emissions from non-lactating pregnant dairy cows while grazing
Methane emissions from non-lactating pregnant dairy cows while grazing
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DOI：
10.1016/j.livsci.2017.10.003
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发表时间：
2017-12-01
影响因子：
1.8
通讯作者：
Carson, Alistair F.
中科院分区：
文献类型：
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作者：
Ferris, Conrad P.;Jiao, Haopeng;Carson, Alistair F.
关于放牧时非泌乳怀孕奶牛的甲烷（CH 4）排放量的信息很少。为了解决这一问题，肠甲烷排放量估计从68个非哺乳期怀孕荷斯坦黑白花奶牛在连续三年（23，22和23头奶牛在第1，2和3年，分别）。这些研究中使用的奶牛范围为实际产犊日期前19 - 69天（开始测量时）。使用六氟化硫（SF6）技术测量了连续6个24小时的甲烷排放量，测量分别从第1-3年的8月28日、9月16日和9月15日开始。奶牛在测量期的第一天和第四天获得新鲜的牧草，但不提供精料补充剂。在三年的实验中，平均甲烷排放量为216克/牛/天，25.2克/千克干物质摄入量。排放量随着泌乳次数的增加而增加，从200（第一次泌乳）到228（>第二次泌乳）克/天。个体奶牛体重与甲烷排放量（R-2 = 0.17）和个体奶牛摄入量与甲烷排放量（R-2 = 0.21）之间的关系较差。
There is little information on methane (CH4) emissions from non-lactating pregnant dairy cattle when grazing. To address this issue, enteric CH4 emissions were estimated from a total of 68 non-lactating pregnant Holstein Friesian dairy cattle during three successive years (23, 22 and 23 cows in year 1, 2 and 3, respectively). Cows used in these studies ranged from 19 to 69 days prior to their actual calving date when measurements commenced. Methane emissions were measured using the sulphur hexafluoride (SF6) technique over six consecutive 24-h periods, with measurements commencing 28 August, 16 September and 15 September during years 1-3, respectively. Cows were given access to fresh grazing on the first and fourth day of the measurement period, but were not offered a concentrate supplement. Across the three years of the experiment mean CH4 emissions were 216 g/cow/day and 25.2 g/kg dry matter intake. Emission increased with increasing lactation number, from 200 (1st lactation) to 228 ( > 2nd lactation) g/day. Relationships between individual cow body weight and methane emissions (R-2 = 0.17) and estimates of intakes for individual cows and CH4 emissions (R-2 = 0.21) were poor.