Including essential oils in lactating dairy cow diets: effects on methane emissions1
S. J. Meale A , A. V. Chaves A B , T. A. McAllister B , A. D. Iwaasa C , W. Z. Yang B and C. Benchaar D E
+ Author Affiliations
- Author Affiliations
A Faculty of Veterinary Science, University of Sydney, Sydney, NSW 2006, Australia.
B Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, T1J 4B1, Canada.
C Semiarid Prairie Agricultural Research Centre, Agriculture and Agri-Food Canada, Swift Current, Saskatchewan, S9H 3X2, Canada.
D Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, J1M 0C8, Canada.
E Corresponding author. Email: chaouki.benchaar@agr.gc.ca
Animal Production Science 54(9) 1215-1218 https://doi.org/10.1071/AN14152
Submitted: 6 March 2014 Accepted: 29 March 2014 Published: 10 July 2014
Abstract
The objective of this study was to examine the effects of dietary supplementation of garlic and juniper berry essential oils on methane (CH4) and carbon dioxide (CO2) emissions from lactating dairy cows. Four ruminally cannulated, lactating Holstein cows were used in a 4 × 4 Latin square (21-day period; 11 days of adaptation). Cows were fed a total mixed ration (60 : 40 forage : concentrate ratio) without supplementation (no additive; negative control) or supplemented with monensin (330 mg/day; positive control), garlic oil (5 g/day) or juniper berry oil (2 g/day). Methane and CO2 emissions were measured using the sulfur hexafluoride tracer technique. Dietary supplementation of lactating cows with juniper berry oil or garlic oil did not affect (P > 0.05) CH4 or CO2 production, whether expressed as g/day, g/kg DMI, g/kg milk or as g/kg DMI/BW0.75. At the doses administered in this study, the anti-methanogenic effect of garlic and juniper berry oils previously observed in vitro were not confirmed in vivo.
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