scholarly journals Comparison of the sulfur hexafluoride tracer and respiration chamber techniques for estimating methane emissions and correction for rectum methane output from dairy cows

2012 ◽  
Vol 95 (6) ◽  
pp. 3139-3148 ◽  
Author(s):  
C. Muñoz ◽  
T. Yan ◽  
D.A. Wills ◽  
S. Murray ◽  
A.W. Gordon
Keyword(s):  
Dairy Cows ◽  
Sulfur Hexafluoride ◽  
Methane Emissions ◽  
Respiration Chamber

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

79 Comparison of enteric methane emissions between Holstein heifers and steers using respiration chamber data

2021 ◽  
Vol 12 (1) ◽  
pp. 58
Author(s):  
Xianjiang Chen ◽  
Christopher Reynolds ◽  
Les Crompton ◽  
Huiru Zheng ◽  
Haiying Wang ◽  
...  
Keyword(s):  
Methane Emissions ◽  
Respiration Chamber ◽  
Enteric Methane ◽  
Enteric Methane Emissions
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