scholarly journals Measurement of Enteric Methane Emissions by the SF6 Technique Is Not Affected by Ambient Weather Conditions

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 528
Author(s):  
Peter J. Moate ◽  
Jennie E. Pryce ◽  
Leah C. Marett ◽  
Josie B. Garner ◽  
Matthew H. Deighton ◽  
...  
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Dairy Cows ◽  
Methane Production ◽  
Daily Rainfall ◽  
Weather Conditions ◽  
Methane Yield ◽  
Weather Factors ◽  
Ambient Temperatures ◽  
Enteric Methane

Despite the fact that the sulphur hexafluoride (SF6) tracer technique was developed over 25 years ago to measure methane production from grazing and non-housed animals, no studies have specifically investigated whether ambient wind speed, temperature, relative humidity and rainfall influence the accuracy of the method. The aim of this research was to investigate how these weather factors influence the measurement of enteric methane production by the SF6 technique. Six different cohorts of dairy cows (40 per cohort) were kept outdoors and fed a common diet during spring in 3 consecutive years. Methane production from individual cows was measured daily over the last 5 days of each 32-day period. An automated weather station measured air temperature, wind speed, relative humidity and rainfall every 10 min. Regression analyses were used to relate the average daily wind speed, average daily temperature, average daily relative humidity and total daily rainfall measurements to dry matter intake, average daily methane production and methane yield of each cohort of cows. It was concluded that the modified SF6 technique can be used outdoors during a range of wind speeds, ambient temperatures, relative humidities and rainfall conditions without causing a significant effect on the measurement of methane production or methane yield of dairy cows.

scholarly journals Feeding saponin-containing Yucca schidigera and Quillaja saponaria to decrease enteric methane production in dairy cows

2009 ◽  
Vol 92 (6) ◽  
pp. 2809-2821 ◽  
Author(s):  
L. Holtshausen ◽  
A.V. Chaves ◽  
K.A. Beauchemin ◽  
S.M. McGinn ◽  
T.A. McAllister ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Methane Production ◽  
Quillaja Saponaria ◽  
Yucca Schidigera ◽  
Enteric Methane

Statistical Analysis of Weather Effects on PM2.5

2012 ◽  
Vol 610-613 ◽  
pp. 1033-1040
Author(s):  
Wei Dai ◽  
Jia Qi Gao ◽  
Bo Wang ◽  
Feng Ouyang
Keyword(s):  
Statistical Analysis ◽  
Wind Speed ◽  
Relative Humidity ◽  
Statistical Methods ◽  
Predictive Analytics ◽  
Hypothesis Test ◽  
Meteorological Data ◽  
Weather Conditions ◽  
Statistical Distribution ◽  
Weather Effects

Effects of weather conditions including temperature, relative humidity, wind speed, wind and direction on PM2.5 were studied using statistical methods. PM2.5 samples were collected during the summer and the winter in a suburb of Shenzhen. Then, correlations, hypothesis test and statistical distribution of PM2.5 and meteorological data were analyzed with IBM SPSS predictive analytics software. Seasonal and daily variations of PM2.5 have been found and these mainly resulted from the weather effects.

scholarly journals Does Dietary Mitigation of Enteric Methane Production Affect Rumen Function and Animal Productivity in Dairy Cows?

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0140282 ◽  
Author(s):  
Jolien B. Veneman ◽  
Stefan Muetzel ◽  
Kenton J. Hart ◽  
Catherine L. Faulkner ◽  
Jon M. Moorby ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Methane Production ◽  
Enteric Methane

scholarly journals Differential rumination, intake, and enteric methane production of dairy cows in a pasture-based automatic milking system

2015 ◽  
Vol 98 (10) ◽  
pp. 7248-7263 ◽  
Author(s):  
L.J. Watt ◽  
C.E.F. Clark ◽  
G.L. Krebs ◽  
C.E. Petzel ◽  
S. Nielsen ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Methane Production ◽  
Enteric Methane ◽  
Automatic Milking System ◽  
Automatic Milking

The effect of forage quality on predicted enteric methane production from dairy cows

2010 ◽  
Vol 8 (4) ◽  
pp. 250-256 ◽  
Author(s):  
Mizeck G. G. Chagunda ◽  
Jennifer F. Flockhart ◽  
David J. Roberts
Keyword(s):  
Dairy Cows ◽  
Methane Production ◽  
Forage Quality ◽  
Enteric Methane

Nitrate supplementation has marginal effects on enteric methane production from Bos indicus steers fed Flinders grass (Iseilema spp.) hay, but elevates blood methaemoglobin concentrations

2018 ◽  
Vol 58 (2) ◽  
pp. 262 ◽  
Author(s):  
N. Tomkins ◽  
A. J. Parker ◽  
G. Hepworth ◽  
M. J. Callaghan
Keyword(s):  
Methane Production ◽  
Bos Indicus ◽  
Calcium Nitrate ◽  
Open Circuit ◽  
Methane Yield ◽  
Elevated Concentration ◽  
Significant Treatment ◽  
Volatile Fatty Acid Concentration ◽  
Enteric Methane ◽  
Supplement Intake

This experiment has quantified the methane abatement potential of nitrate in the context of extensively managed cattle. The experimental protocol consisted of two, 4 × 4 Latin square design using eight rumen fistulated Bos indicus steers fed Flinders grass (Iseilema spp.) hay ad libitum. The treatments were Control (nil nitrogen supplement), urea (32.5 g/day urea) and two levels of calcium nitrate: CaN1 and CaN2 (to provide 4.6 g and 7.9 g NO3/kg DM equivalent to ~0.46% and 0.80% of DM, respectively). Complete supplement intake was ensured by dosing any supplement that had not been voluntarily consumed, through the rumen fistula, 1 h after feeding. Enteric methane production was measured using open circuit respiration chambers. Methane yield (g/kg DM intake) from the CaN2 treatment tended to be lower (P < 0.07) than either the Control or urea treatments. There were no significant differences in methane yield between Control, urea or CaN1 treatments. Mean blood methaemoglobin concentrations were significantly (P < 0.001) higher for CaN2 animals compared with the Control, urea or CaN1 treatments. In addition, a significant time effect after dosing (P < 0.001) and a significant interaction between treatment and time after dosing (P < 0.001) was apparent. Overall mean total volatile fatty acid concentration was 74.0 ± 1.53 mM with no significant treatment effect, but a significant effect for both time of sampling (3 h vs 6 h) within days and among 7 sampling days. The inclusion of calcium nitrate as a non-protein-N source significantly reduced the molar proportions of butyrate (P < 0.001), iso-butyrate (P < 0.05) and iso-valerate (P < 0.001) compared with the Control. The provision of nitrate supplements, providing both a NPN and an alternative sink for H that would otherwise support enteric methanogenesis, has some potential. In extensive grazing systems effective methane abatement strategies are required. The elevated concentration of MetHb using CaN2 suggests that the strategy of replacing urea with nitrate in supplements fed to extensively managed cattle in the northern rangelands may be inappropriate where supplement intake cannot be controlled on an individual animal basis and forage quality is seasonally variable.

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