Title
Methane emissions and digestive physiology of non-lactating dairy cows fed pasture forage
Date Issued
01 January 2007
Access level
open access
Resource Type
journal article
Author(s)
Grasslands Research Centre
Publisher(s)
Agricultural Institute of Canada
Abstract
The objective of this study was to identify intake and digestion characteristic(s) responsible for variation in methane (CH4) emissions from non-lactating cows fed pasture forage. Nine Friesian x Jersey cows ranked low, medium or high CH4 emitters [group means 15.3, 19.2 and 24.8 g kg-1 dry matter intake (DMI), respectively; P = 0.015] were selected from a herd of 302 lactating cows. The selected cows were dried-off, rumen-fistulated, and fed indoors on fresh pasture forage at 0700 and 1700. Voluntary feed intake (VFI), feeding behaviour and intake rates (IR) were measured over 5 d. Feed allowance was reduced to 90% of VFI for measurement of CH4 emissions and rumen fermentation and digestion kinetics parameters. Although some variation in CH4 yield remained among the animals (26.4 ± 3.6 g kg-1 DMI), the previous ranking of cows during lactation was no longer evident during this study (P = 0.41). The change in CH4 yields may have resulted from lower feed intakes of lower quality pasture compared with grazing. Regression analysis showed that absolute CH4 emission (g d-1) was best described by DMI and rumen acetate concentration (ACE) before the PM feeding (ACE 1700) (P2 = 0.88), whereas CH4 yield (g kg-1 DMI) was mainly a function of ACE 1700 h alone (R2 = 0.84). We suggest that large animal-to-animal variations in CH4 yield are most likely associated with high intakes and concomitant effects of salivation and rumen digestion and passage.
Start page
601
End page
613
Volume
87
Issue
4
Language
English
OCDE Knowledge area
Ciencia animal, Ciencia de productos lácteos
Subjects
Scopus EID
2-s2.0-37649010889
Source
Canadian Journal of Animal Science
ISSN of the container
00083984
Sources of information:
Directorio de Producción Científica
Scopus