scholarly journals Methane Emissions from Dairy Cows Measured Using the Sulfur Hexafluoride (SF6) Tracer and Chamber Techniques

2007 ◽  
Vol 90 (6) ◽  
pp. 2755-2766 ◽  
Author(s):  
C. Grainger ◽  
T. Clarke ◽  
S.M. McGinn ◽  
M.J. Auldist ◽  
K.A. Beauchemin ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Sulfur Hexafluoride ◽  
Methane Emissions

Methane emissions from grazing Jersey×Friesian dairy cows in mid lactation

2008 ◽  
Vol 48 (2) ◽  
pp. 230 ◽  
Author(s):  
A. Cavanagh ◽  
L. McNaughton ◽  
H. Clark ◽  
C. Greaves ◽  
J. M. Gowan ◽  
...  
Keyword(s):  
New Zealand ◽  
Dairy Cows ◽  
Dry Matter ◽  
Sulfur Hexafluoride ◽  
Methane Emissions ◽  
Tracer Technique ◽  
Dilution Technique ◽  
Ad Libitum ◽  
Tracer Dilution ◽  
Clover Pasture

As part of a large quantitative trait loci trial, methane emissions were measured on 698 second and third lactation dairy cows which were the progeny of six bulls. The trial ran over two 4-week periods in January 2004 and 2005. Methane samples were collected over 24 h on each of four consecutive days in 2004 and three consecutive days in 2005. Methane emissions were measured using the sulfur hexafluoride (SF6) tracer dilution technique. During measurement periods, all cows grazed grass–clover pasture with ad libitum herbage allowances. Herbage dry matter intakes (DMI) were calculated using Australian Feeding Standards based on individual cow data of milk yield, liveweight, liveweight change and cow body condition. The average DMI was estimated to be 17.1 kg/day (s.d. = 2.0). Daily methane emissions ranged from 151 to 497 g/day with an average of 311 g/day (s.d. = 43.8) or 18.2 g/kg DMI (s.d. = 2.8); this is 15.7% lower than the figure currently used in the New Zealand national inventory. This study also indicates that there are large differences between cows in methane emissions per kg DMI when estimated using the SF6 tracer technique.

Effect of sunflower oil supplementation on methane emissions of dairy cows grazing Urochloa brizantha cv. marandu

2017 ◽  
Vol 57 (7) ◽  
pp. 1431 ◽  
Author(s):  
B. C. Mata e Silva ◽  
F. C. F. Lopes ◽  
L. G. R. Pereira ◽  
T. R. Tomich ◽  
M. J. F. Morenz ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Dietary Fat ◽  
Sunflower Oil ◽  
Sulfur Hexafluoride ◽  
Block Design ◽  
Bos Indicus ◽  
Methane Emissions ◽  
Cow Milk ◽  
Lactating Dairy Cows ◽  
Urochloa Brizantha

The objective of the present study was to evaluate the effect of sunflower oil supplementation on methane (CH4) emission of crossbred Holstein × Gyr (Bos indicus) dairy cows grazing tropical pasture. Lactating dairy cows were fed Urochloa brizantha (syn Brachiaria brizantha) pasture managed under rotational grazing. Sunflower oil was supplemented to cows using concentrates with inclusion at 0% or 14.9% (DM basis). Crude fat concentrations in these concentrates were 2.4% and 13.8% respectively (DM basis). Dietary fat concentrations for control and supplemented sunflower oil treatments were 3.2% and 5.2% (DM basis) respectively. Sixteen lactating cows Holstein × Gyr (Bos indicus; 240 ± 10 days in milk, 524 ± 57 kg of bodyweight, 11.2 ± 2.30 kg/day of milk) were used in the study. Methane emissions were estimated by the sulfur hexafluoride tracer technique. The experiment was a randomised-block design with two repetitions of pasture area, with two treatments (0 g or 383 g of sunflower oil supplementation, DM basis) and four replications (cows) per treatment per block. Methane emission and yield expressed as g CH4/day and g CH4/kg of DM intake decreased 21.5% (P = 0.048) and 20.2% (P = 0.032) respectively, in cows supplemented with sunflower oil compared with unsupplemented cows. There was no effect (P = 0.29) of sunflower oil supplementation on CH4 expressed as g CH4/kg of milk. Lactating dairy cows grazing tropical-grass pasture supplemented with sunflower oil (5.3% dietary fat; 383 g oil/day) demonstrated potential for mitigating CH4 emissions without negatively affecting cow milk yield or composition.

scholarly journals Grape marc reduces methane emissions when fed to dairy cows

2014 ◽  
Vol 97 (8) ◽  
pp. 5073-5087 ◽  
Author(s):  
P.J. Moate ◽  
S.R.O. Williams ◽  
V.A. Torok ◽  
M.C. Hannah ◽  
B.E. Ribaux ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Methane Emissions ◽  
Grape Marc

scholarly journals PSII-17 Program Chair Poster Pick: Effect of ruminal protozoa on methane emissions in ruminants – a meta-analysis

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 397-398
Author(s):  
Xiaoxia Dai ◽  
Kenneth Kalscheur ◽  
Pekka Huhtanen ◽  
Antonio Faciola
Keyword(s):  
Dairy Cows ◽  
Meta Analysis ◽  
Random Effect ◽  
Negative Relationship ◽  
Small Ruminants ◽  
Methane Emissions ◽  
Mitigation Strategies ◽  
Positive Relationships ◽  
Ruminal Fermentation ◽  
The Relationship

Abstract The effects of ruminal protozoa (RP) concentration on methane emissions from ruminants were evaluated in a meta-analysis using 67 publications reporting data from 85 in vivo experiments. Experiments included in the database reported methane emissions (g/kg DMI) and RP (log10 cells/mL) from the same group of animals. Quantitative data including diet chemical composition, ruminal fermentation, total tract digestibility, and milk production; and qualitative information including methane mitigation strategies, animal type, and methane measurement methods were also collected. The studies were conducted in dairy cows (51%), beef steers (32%) and small ruminants (32%). 70% of the studies reported a reduction in methane emissions. Supplemental lipids reduced methane emissions 95% of the time. The relationship between methane emissions and RP concentration was evaluated as a random coefficient model with the experiment as a random effect and weighted by the inverse pooled SEM squared, including the possibility of covariance between the slope and the intercept. A quadratic effect of RP concentration on methane emissions was detected: CH4= -28.8 + 12.2 × RP-0.64 × RP2. To detect potential interfering factors in the relationship, the influence of several qualitative and quantitative factors were separately tested. Acetate, butyrate, and isobutyrate molar proportions had positive relationships with methane emissions and influenced the relationship between RP concentration and methane emissions, where the presence of ruminal fermentation variables reduced the effects of RP concentration in methane emissions. Total tract digestibility of DM, OM, and CP had negative relationships while NDF digestibility had a positive relationship with methane emissions; however, they only changed the magnitude of intercept and slope of RP and RP2 for the relationship. For dairy cows, milk fat and protein concentrations had positive relationships and milk yield had a negative relationship with methane emissions and changed the magnitude of intercept and slope of RP and RP2 for the relationship.

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