文献类型： 外文期刊

作者： Wang, Rong ¹ ; Wang, Min ¹ ; Zhang, Xiu Min ¹ ; Yang, Hua Ming ³ ; Wen, Jiang Nan ¹ ; Ma, Zhi Yuan ¹ ; Feng, Bai Lin ⁴ ;

作者机构： 1.Chinese Acad Sci, Inst Subtrop Agr, Minist Agr,Natl Engn Lab,Natl Engn Lab Pollut Con, South Cent Expt Stn Anim Nutr & Feed Sci,CAS Key, Changsha 410125, Hunan, Peoples R China

2.Hunan Agr Univ, Coll Anim Sci & Technol, Changsha 410128, Hunan, Peoples R China

3.Jilin Acad Agr Sci, Changchun 130033, Jilin, Peoples R China

4.Youzhuo Anim Husb Co Ltd, Ningxiang 410601, Hunan, Peoples R China

5.South China Agr Univ, Coll Anim Sci, Subtrop Inst Anim Nutr & Feed, Guangdong Prov Key Lab Anim Nutr Control, Guangzhou 510642, Guangdong, Peoples R China

关键词： methane emission; respiratory chamber; interval; calculation method

期刊名称：JOURNAL OF DAIRY SCIENCE （ 影响因子：4.034； 五年影响因子：4.354 ）

ISSN： 0022-0302

年卷期： 2019 年 102 卷 7 期

页码：

收录情况： SCI

摘要： Respiration chambers share one analyzer working in parallel, and methane (CH4) concentrations have to be measured at certain intervals. The maximum and minimum values in the kinetics of CH4 emissions can be missed during the interval between measurements, which may influence the quantification of CH4 emissions. Chambers must be opened for morning feeding and cleaning, which causes a loss of CH4 data. Calculation methods are needed to estimate the lost CH4 emission data, which may influence the estimated amount of daily CH4 emissions. In this study, we measured the CH4 emissions of 10 growing Chinese Holstein dairy heifers in respiration chambers. Methane concentrations were measured every 0.5 min to obtain the 23-11 kinetics of CH(4 )emissions, which were further selected at different intervals between measurements (i.e., 5, 30, 60, 120, 180, and 240 min) to evaluate the effects of interval on quantification of CH4 emissions. The missing 1-h kinetics of CH4 emissions before feeding were not measured, and 2 calculation methods were used to estimate the missing 1-h kinetics of CH4 emissions: mean value of measuring period (the mean method) and the nearest value of measurement just before chamber opening (the nearest method). The results showed that the rates of CH4 emission from 10 heifers varied from 4.56 to 11.42 g/h. The increment of intervals decreased maximum rate of CH4 emission and increased minimum rate of CH4 emission. Interval caused less than 5% of the difference in measuring CH4 emissions. Although the mean method had greater estimated daily CH4 emission than the nearest method, the difference was within 3%. The interval between measurements (<= 3 h) and calculation method had little influence on enteric CH(4)4 emission measurements.