scholarly journals Can live weight be used as a proxy for enteric methane emissions from pasture-fed sheep?

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
J. M. Moorby ◽  
H. R. Fleming ◽  
V. J. Theobald ◽  
M. D. Fraser
Keyword(s):  
Live Weight ◽  
Methane Emissions ◽  
Enteric Methane ◽  
Enteric Methane Emissions

A review of feeding supplementary nitrate to ruminant animals: nitrate toxicity, methane emissions, and production performance

2014 ◽  
Vol 94 (4) ◽  
pp. 557-570 ◽  
Author(s):  
Chanhee Lee ◽  
Karen A. Beauchemin
Keyword(s):  
Dry Matter ◽  
Meta Analysis ◽  
Live Weight ◽  
Methane Emissions ◽  
Production Performance ◽  
Dry Matter Intake ◽  
Nitrous Oxide Emissions ◽  
Enteric Methane ◽  
Ruminant Animals ◽  
Enteric Methane Emissions

Lee, C. and Beauchemin, K. A. 2014. A review of feeding supplementary nitrate to ruminant animals: Nitrate toxicity, methane emissions, and production performance. Can. J. Anim. Sci. 94: 557–570. The purpose of this review is to discuss the risks and benefits of using supplementary nitrate to reduce enteric methane emissions in ruminants based on the results of a meta-analysis. The meta-analysis confirmed possible nitrate poisoning triggered by higher blood methemoglobin levels with increasing nitrate consumption of ruminants: methemoglobin (%)=41.3×nitrate [g kg−1 body weight (BW) d−1]+1.2; R 2=0.76, P<0.001. However, acclimatizing animals to nitrate reduced the toxicity of nitrate: methemoglobin (%)=4.2×nitrate (g kg−1 BW d−1)+0.4, R 2=0.76, P=0.002. Animals fed nitrate reduced enteric methane emissions in a dose-response manner: methane [g kg−1 dry matter intake (DMI)]=−8.3×nitrate (g kg−1 BW d−1)+15.2, R 2=0.80, P<0.001. The reduction of enteric methane emissions due to supplementary nitrate was effective and consistent in both in vitro and in vivo studies and also persistent in several long-term studies. Dry matter intake and live weight gain (LWG) of cattle were not affected by nitrate: DMI change, R 2=0.007, P=0.65; LWG change, R 2=0.03, P=0.31. It is anticipated that supplementary nitrate as a substitute for urea may change urinary nitrogen composition in a manner that increases ammonia and nitrous oxide emissions from manure. Furthermore, supplementary nitrate may have various physiological roles in nitric oxide metabolism in ruminants. In conclusion, supplementary nitrate is a viable means of mitigating enteric methane emissions due to its consistent and persistent efficacy. Risk of toxicity can be lowered by gradual acclimation of animals to nitrate. However, lowered methane production may not re-direct additional metabolizable energy towards animal production.

scholarly journals Enteric methane emission by Lactating and Dry cows in rye grass-clover pasture in the high Andean zone of Peru

2021 ◽  
Author(s):  
Catherine Yasmín Salas-Riega ◽  
Sandra Osorio ◽  
Julyssa del Pilar Gamarra ◽  
Victor Alvarado-Bolovich ◽  
Cesar Osorio ◽  
...  
Keyword(s):  
Methane Emission ◽  
Sulfur Hexafluoride ◽  
Live Weight ◽  
Methane Emissions ◽  
Tracer Gas ◽  
Lactating Cows ◽  
The Andes ◽  
Enteric Methane ◽  
Gross Energy ◽  
Enteric Methane Emissions

Abstract The objective of the study was to determine the enteric methane emissions from lactating and dry cows fed on rotational grazing on ryegrass/clover with supplementation of oat and vetch forage in the Andes of Peru. Sulfur hexafluoride (SF6) tracer gas methodology was used to determine enteric methane emission; the external marker Titanium dioxide (TiO2) to determine the production of feces and the protein in feces was used to estimate the digestibility of the feed. The enteric methane emissions of 5 lactating cows (LC) and 6 dry cows (DC) Brown Swiss breed were 358.5 and 337.4 g CH4/cow/day for LC and DC, respectively (P> 0.05). The conversion factor from gross energy to methane (Ym;%) was 9.7 for LC and 9.6 for DC. The enteric methane yield per kilogram of organic matter consumption was 32.5 g CH4/lactating cow /day and 32.2 g CH4/dry cow/day (p> 0.05) and the emission per kilogram of metabolic live weight for lactating cows was 3.1 g CH4/kg PV0.75 and for dry cows 2.9 g CH4/kg PV0.75 (P> 0.05). It was concluded that enteric methane emissions are similar for lactating cows and dry cows measured with the SF6 tracer gas technique.

Effect of pasture management on enteric methane emissions from goats

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Naomi Cristina Meister ◽  
Abmael da Silva Cardoso ◽  
Fernando Oliveira Alari ◽  
Nailson Lima Santos Lemos ◽  
Rosa Toyoko Shiraishi Frighetto ◽  
...  
Keyword(s):  
Methane Emissions ◽  
Pasture Management ◽  
Enteric Methane ◽  
Enteric Methane Emissions

scholarly journals Revisiting enteric methane emissions from domestic ruminants and their δ13CCH4 source signature

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jinfeng Chang ◽  
Shushi Peng ◽  
Philippe Ciais ◽  
Marielle Saunois ◽  
Shree R. S. Dangal ◽  
...  
Keyword(s):  
Methane Emissions ◽  
Domestic Ruminants ◽  
Enteric Methane ◽  
Enteric Methane Emissions

Forage brassica: a feed to mitigate enteric methane emissions?

2016 ◽  
Vol 56 (3) ◽  
pp. 451 ◽  
Author(s):  
Xuezhao Sun ◽  
David Pacheco ◽  
Dongwen Luo
Keyword(s):  
Methane Emissions ◽  
Methane Yield ◽  
Forage Crops ◽  
Enteric Methane ◽  
Winter Crop ◽  
Feeding Trials ◽  
Series Of Experiments ◽  
Forage Rape ◽  
Pastoral Farming ◽  
Enteric Methane Emissions

A series of experiments was conducted in New Zealand to evaluate the potential of forage brassicas for mitigation of enteric methane emissions. Experiments involved sheep and cattle fed winter and summer varieties of brassica forage crops. In the sheep-feeding trials, it was demonstrated that several species of forage brassicas can result, to a varying degree, in a lower methane yield (g methane per kg of DM intake) than does ryegrass pasture. Pure forage rape fed as a winter crop resulted in 37% lower methane yields than did pasture. Increasing the proportion of forage rape in the diet of sheep fed pasture linearly decreased methane yield. Feeding forage rape to cattle also resulted in 44% lower methane yield than did feeding pasture. In conclusion, reductions in methane emission are achievable by feeding forage brassicas, especially winter forage rape, to sheep and cattle. Investigating other aspects of these crops is warranted to establish their value as a viable mitigation tool in pastoral farming.

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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