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Journal of Dairy Science Vol. 78 No. 12 2760-2766
© 1995 by American Dairy Science Association ®
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Methane and Carbon Dioxide Emissions from Dairy Cows in Full Lactation Monitored over a Six-Month Period

R. Kinsman 1, F. D. Sauer 1, H. A. Jackson 1, and M. S. Wolynetz 1

1 Centre for Food and Animal Research, Research Branch, Agriculture and Agri-Food Canada, Ottawa, ON, Canada K1A 0C6

Methane and CO2 emissions from a herd of 11 8 lactating cows were measured directly by continuous monitoring with an infrared gas analyzer from 24 gas sampling locations. A total of 112 d of gas output was recorded between June 1993 and November 1993. Recordings were integrated at .5-h intervals, so that there were 48 data points for each 24-h period. The mean 24-h CH4 emission per cow was 587 ± 61.3 L; the range was 436 to 721 L. The mean 24-h CO2 emission per cow was 6137 ± 505 L, and the range was 5032 to 7427 L. These values were not corrected for gas emissions from stored manure, which contributed 5.8 and 6.1%, respectively, to CH4 and CO2 output under conditions of this experiment.

Key Words: methane • carbon dioxide • gas emission

Submitted on March 22, 1995
Accepted on July 10, 1995




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