Does the diurnal pattern of enteric methane emissions from dairy cows change over time?

Animal : an International Journal of Animal Bioscience
M J BellP C Garnsworthy

Abstract

Diet manipulation and genetic selection are two important mitigation strategies for reducing enteric methane (CH4) emissions from ruminant livestock. The aim of this study was to assess whether the diurnal pattern of CH4 emissions from individual dairy cows changes over time when cows are fed on diets varying in forage composition. Emissions of CH4 from 36 cows were measured during milking in an automatic (robotic) milking station in three consecutive feeding periods, for a total of 84 days. In Periods 1 and 2, the 36 cows were fed a high-forage partial mixed ration (PMR) containing 75% forage, with either a high grass silage or high maize silage content. In Period 3, cows were fed a commercial PMR containing 69% forage. Cows were offered PMR ad libitum plus concentrates during milking and CH4 emitted by individual cows was sampled during 8662 milkings. A linear mixed model was used to assess differences among cows, feeding periods and time of day. Considerable variation was observed among cows in daily mean and diurnal patterns of CH4 emissions. On average, cows produced less CH4 when fed on the commercial PMR in feeding Period 3 than when the same cows were fed on high-forage diets in feeding Periods 1 and 2. The average diur...Continue Reading

References

Aug 1, 1995·Journal of Animal Science·K A Johnson, D E Johnson
Jan 29, 2003·Journal of Environmental Quality·H Alan DeRamusPeter C Dickison
Aug 9, 2003·Journal of Dairy Science·P J Kononoff, A J Heinrichs
Dec 18, 2003·Journal of Animal Science·J A N MillsJ France
Jun 22, 2007·Journal of Dairy Science·J L EllisJ France
May 23, 2012·Journal of Dairy Science·P C GarnsworthyN Saunders

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Citations

Jun 26, 2020·Animal : an International Journal of Animal Bioscience·J Lassen, G F Difford

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