Effect of 3-nitrooxypropanol on methane and hydrogen emissions, methane isotopic signature, and ruminal fermentation in dairy cows
Name
Ono Lopez 2016.pdf
Size
588.66 KB
Format
Adobe PDF
Checksum (MD5)
da32082d96feaebf6cbbe49944beeb94
Author(s)
Lopes, J.C.
de Matos, L.F.
Harper, M.T.
Giallongo, F.
Oh, J.
Kindermann, M.
Duval, S.
Hristov, A.N.
Gruen, Danielle Sarah
Ono, Shuhei
Date Issued
April 2016
Journal
Journal of Dairy Science
Publisher
Elsevier
Citation
Lopes, J.C. et al. “Effect of 3-Nitrooxypropanol on Methane and Hydrogen Emissions, Methane Isotopic Signature, and Ruminal Fermentation in Dairy Cows.” Journal of Dairy Science 99, 7 (July 2016): 5335–5344 © 2016 Elsevier
Version
Original manuscript
Abstract
The objective of this crossover experiment was to investigate the effect of a methane inhibitor, 3-nitrooxypropanol (3NOP), on enteric methane emission, methane isotopic composition, and rumen fermentation and microbial profile in lactating dairy cows. The experiment involved 6 ruminally cannulated late-lactation Holstein cows assigned to 2 treatments: control and 3NOP (60 mg/kg of feed dry matter). Compared with the control, 3NOP decreased methane emission by 31% and increased hydrogen emission from undetectable to 1.33 g/d. Methane emissions per kilogram of dry matter intake and milk yield were also decreased 34% by 3NOP. Milk production and composition were not affected by 3NOP, except milk fat concentration was increased compared with the control. Concentrations of total VFA and propionate in ruminal fluid were not affected by treatment, but acetate concentration tended to be lower and acetate-to-propionate ratio was lower for 3NOP compared with the control. The 3NOP decreased the molar proportion of acetate and increase those of propionate, butyrate, valerate, and isovalerate. Deuterium-to-hydrogen ratios of methane and the abundance of ¹³CH₃D were similar between treatments. Compared with the control, minor (4‰) depletion in the ¹³C/¹²C ratio was observed for 3NOP. Genus composition of methanogenic archaea (Methanobrevibacter, Methanosphaera, and Methanomicrobium) was not affected by 3NOP, but the proportion of methanogens in the total cell counts tended to be decreased by 3NOP. Prevotella spp., the predominant bacterial genus in ruminal contents in this experiment, was also not affected by 3NOP. Compared with the control, Ruminococcus and Clostridium spp. were decreased and Butyrivibrio spp. was increased by 3NOP. This experiment demonstrated that a substantial inhibition of enteric methane emission by 3NOP in dairy cows was accompanied with increased hydrogen emission and decreased acetate-to-propionate ratio; however, neither an effect on rumen archaeal community composition nor a significant change in the isotope composition of methane was observed.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3168/jds.2015-10832
