title: Methane and carbon dioxide emissions from dairy cows in full lactation monitored over a six-month period.
abstract: Methane and CO2 emissions from a herd of 118 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.
authors.affiliation: Centre for Food and Animal Research, Agriculture and Agri-Food Canada, Ottawa, ON, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Kinsman
authors.forename: F D
authors.initials: FD
authors.lastname: Sauer
authors.forename: H A
authors.initials: HA
authors.lastname: Jackson
authors.forename: M S
authors.initials: MS
authors.lastname: Wolynetz
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism*; D002417:Cattle / Q000502:physiology*; D002940:Circadian Rhythm; D005260:Female; D007774:Lactation / Q000502:physiology*; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D012621:Seasons
chemical_list: D002245:Carbon Dioxide; D008697:Methane