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Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows

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Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows. / Petersen, Søren O; Hellwing, Anne Louise Frydendahl; Brask, Maike; Hojberg, Ole; Poulsen, Morten; Zhu, Zhigang; Baral, Khagendra Raj; Lund, Peter.

I: Journal of Environmental Quality (Online), Bind 44, Nr. 4, 2015, s. 1063-1070.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Petersen, SO, Hellwing, ALF, Brask, M, Hojberg, O, Poulsen, M, Zhu, Z, Baral, KR & Lund, P 2015, 'Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows', Journal of Environmental Quality (Online), bind 44, nr. 4, s. 1063-1070. https://doi.org/10.2134/jeq2015.02.0107

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Petersen, Søren O ; Hellwing, Anne Louise Frydendahl ; Brask, Maike ; Hojberg, Ole ; Poulsen, Morten ; Zhu, Zhigang ; Baral, Khagendra Raj ; Lund, Peter. / Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows. I: Journal of Environmental Quality (Online). 2015 ; Bind 44, Nr. 4. s. 1063-1070.

Bibtex

@article{0936ab72a2544c6b8918f24fb8a5680d,
title = "Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows",
abstract = "Nitrate supplements to cattle diets can reduce enteric CH4 emissions. However, if NO3- metabolism stimulates N2O emissions, this will reduce the effectiveness of dietary NO3- for CH4 mitigation. We quantified N2O emissions as part of a dairy cow feeding experiment where urea was substituted in nearly iso-N diets with 0, 5, 14 or 21 g NO3- kg-1 DM. The feeding experiment was a Latin square with repetition of period 1. Each period lasted 4 weeks, with CH4 emission measurements in week 4 using respiration chambers. During period 3, N2O concentrations in chamber outlet air were monitored semi-continuously during 48 h. High, but fluctuating N2O concentrations were seen at the two highest NO3- levels (up to between 2 and 5 µL L-1), and dynamics were linked with recent feed intake. In periods 4 and 5, N2O concentrations and feed intake were determined from all four respiration chambers during two 7-h periods. Emissions of N2O coincided with feed intake, again with N2O concentrations in the µL L-1 range at the two highest NO3- intake levels. Neither feed nor excretion of NO3- via urine were significant sources of N2O, indicating that emissions came from the animals. Leakages due to rumen fistulation could also not account for N2O emissions. Nitrous oxide emission factors ranged between 0.7 and 1.0% except in one case at 21 g NO3- kg-1 DM, where it was 3.4%. When accounting for N2O emissions at the highest NO3- intake level, the overall GHG mitigation effect in two different animal-diet combinations changed from -47 to -40%, and from -19 to -17%, respectively, due to N2O emissions. ",
keywords = "dairy cow, methane, nitrous oxide, respiration chamber, laser spectrometry",
author = "Petersen, {S{\o}ren O} and Hellwing, {Anne Louise Frydendahl} and Maike Brask and Ole Hojberg and Morten Poulsen and Zhigang Zhu and Baral, {Khagendra Raj} and Peter Lund",
year = "2015",
doi = "10.2134/jeq2015.02.0107",
language = "English",
volume = "44",
pages = "1063--1070",
journal = "Journal of Environmental Quality",
issn = "0047-2425",
publisher = "American Society of Agronomy",
number = "4",

}

RIS

TY - JOUR

T1 - Dietary Nitrate for Methane Mitigation Leads to Nitrous Oxide Emissions from Dairy Cows

AU - Petersen, Søren O

AU - Hellwing, Anne Louise Frydendahl

AU - Brask, Maike

AU - Hojberg, Ole

AU - Poulsen, Morten

AU - Zhu, Zhigang

AU - Baral, Khagendra Raj

AU - Lund, Peter

PY - 2015

Y1 - 2015

N2 - Nitrate supplements to cattle diets can reduce enteric CH4 emissions. However, if NO3- metabolism stimulates N2O emissions, this will reduce the effectiveness of dietary NO3- for CH4 mitigation. We quantified N2O emissions as part of a dairy cow feeding experiment where urea was substituted in nearly iso-N diets with 0, 5, 14 or 21 g NO3- kg-1 DM. The feeding experiment was a Latin square with repetition of period 1. Each period lasted 4 weeks, with CH4 emission measurements in week 4 using respiration chambers. During period 3, N2O concentrations in chamber outlet air were monitored semi-continuously during 48 h. High, but fluctuating N2O concentrations were seen at the two highest NO3- levels (up to between 2 and 5 µL L-1), and dynamics were linked with recent feed intake. In periods 4 and 5, N2O concentrations and feed intake were determined from all four respiration chambers during two 7-h periods. Emissions of N2O coincided with feed intake, again with N2O concentrations in the µL L-1 range at the two highest NO3- intake levels. Neither feed nor excretion of NO3- via urine were significant sources of N2O, indicating that emissions came from the animals. Leakages due to rumen fistulation could also not account for N2O emissions. Nitrous oxide emission factors ranged between 0.7 and 1.0% except in one case at 21 g NO3- kg-1 DM, where it was 3.4%. When accounting for N2O emissions at the highest NO3- intake level, the overall GHG mitigation effect in two different animal-diet combinations changed from -47 to -40%, and from -19 to -17%, respectively, due to N2O emissions.

AB - Nitrate supplements to cattle diets can reduce enteric CH4 emissions. However, if NO3- metabolism stimulates N2O emissions, this will reduce the effectiveness of dietary NO3- for CH4 mitigation. We quantified N2O emissions as part of a dairy cow feeding experiment where urea was substituted in nearly iso-N diets with 0, 5, 14 or 21 g NO3- kg-1 DM. The feeding experiment was a Latin square with repetition of period 1. Each period lasted 4 weeks, with CH4 emission measurements in week 4 using respiration chambers. During period 3, N2O concentrations in chamber outlet air were monitored semi-continuously during 48 h. High, but fluctuating N2O concentrations were seen at the two highest NO3- levels (up to between 2 and 5 µL L-1), and dynamics were linked with recent feed intake. In periods 4 and 5, N2O concentrations and feed intake were determined from all four respiration chambers during two 7-h periods. Emissions of N2O coincided with feed intake, again with N2O concentrations in the µL L-1 range at the two highest NO3- intake levels. Neither feed nor excretion of NO3- via urine were significant sources of N2O, indicating that emissions came from the animals. Leakages due to rumen fistulation could also not account for N2O emissions. Nitrous oxide emission factors ranged between 0.7 and 1.0% except in one case at 21 g NO3- kg-1 DM, where it was 3.4%. When accounting for N2O emissions at the highest NO3- intake level, the overall GHG mitigation effect in two different animal-diet combinations changed from -47 to -40%, and from -19 to -17%, respectively, due to N2O emissions.

KW - dairy cow

KW - methane

KW - nitrous oxide

KW - respiration chamber

KW - laser spectrometry

U2 - 10.2134/jeq2015.02.0107

DO - 10.2134/jeq2015.02.0107

M3 - Journal article

C2 - 26437087

VL - 44

SP - 1063

EP - 1070

JO - Journal of Environmental Quality

JF - Journal of Environmental Quality

SN - 0047-2425

IS - 4

ER -