TY - JOUR
T1 - Short communication
T2 - Relationship of dry matter intake with enteric methane emission measured with the GreenFeed system in dairy cows receiving a diet without or with 3-nitrooxypropanol
AU - Hristov, A. N.
AU - Melgar, A.
N1 - Funding Information:
This work was supported by the USDA National Institute of Food and Agriculture Federal Appropriations under Project PEN 04539 and Accession number 1000803. The authors thank DSM Nutritional Products (Basel, Switzerland) for providing partial financial support for the main experiment of this project. The authors also thank the staff of The Pennsylvania State University's Dairy Teaching and Research Center for their conscientious care and management of the animals in the main experiment. A. Melgar was supported by the Government of Panama through the IFARHU-SENACYT Scholarship Program and the Agricultural Research Institute of Panama (IDIAP). A. N. Hristov 0000-0002-0884-4203, None. All procedures in this experiment were performed by trained personnel and were approved by The Pennsylvania State University Institutional Animal Care and Use Committee. None of the data were deposited in an official repository.
Funding Information:
This work was supported by the USDA National Institute of Food and Agriculture Federal Appropriations under Project PEN 04539 and Accession number 1000803. The authors thank DSM Nutritional Products (Basel, Switzerland) for providing partial financial support for the main experiment of this project. The authors also thank the staff of The Pennsylvania State University’s Dairy Teaching and Research Center for their conscientious care and management of the animals in the main experiment. A. Melgar was supported by the Government of Panama through the IFARHU-SENACYT Scholarship Program and the Agricultural Research Institute of Panama (IDIAP).
Publisher Copyright:
© 2020 The Animal Consortium
PY - 2020/1
Y1 - 2020/1
N2 - The relationship between DM intake (DMI) and enteric methane emission is well established in ruminant animals but may depend on measurement technique (e.g. spot v. continuous gas sampling) and rumen environment (e.g. use of fermentation modifiers). A previous meta-analysis has shown a poor overall (i.e. 24 h) relationship of DMI with enteric methane emission in lactating dairy cows when measured using the GreenFeed system (GF; Symposium review: uncertainties in enteric methane inventories, measurement techniques, and prediction models. Journal of Dairy Science 101, 6655 to 6674). Therefore, we examined this relationship in a 15-week experiment with lactating dairy cows receiving a control diet or a diet containing the investigational product 3-nitrooxypropanol (3-NOP), an enteric methane inhibitor, applied at 60 mg/kg feed DM. Daily methane emission, measured using GF, and DMI were clustered into 12 feed-intake timeslots of 2 h each. Methane emission and DMI were the lowest 2 h before feeding and the highest within 6 h after feed provision. The overall (24 h) relationship between methane emission and DMI was poor (R2 = 0.01). The relationship for the control (but not 3-NOP) cows was improved (R2 = 0.31; P < 0.001) when DMI was allocated to timeslots and was strongest (R2 = 0.51; P < 0.001) 8 to 10 h after feed provision. Analysis of the 3-NOP emission data showed marked differences in the mitigation effect over time. There was a lack of effect in the 2-h timeslot before feeding, the mitigation effect was highest (45%) immediately after feed provision, persisted at around 32% to 39% within 10 h after feed provision, and decreased to 13%, 4 h before feeding. These trends were clearly related to DMI (i.e. 3-NOP intake) by the cows. The current analysis showed that the relationship of enteric methane emission, as measured using GF, and DMI in dairy cows depends on the time of measurement relative to time of feeding. The implication of this finding is that a sufficient number of observations, covering the entire 24-h feeding cycle, have to be collected to have representative emission estimates using the GF system. This analysis also revealed that the methane mitigation effect of 3-NOP is highest immediately after feed provision and lowest before feeding.
AB - The relationship between DM intake (DMI) and enteric methane emission is well established in ruminant animals but may depend on measurement technique (e.g. spot v. continuous gas sampling) and rumen environment (e.g. use of fermentation modifiers). A previous meta-analysis has shown a poor overall (i.e. 24 h) relationship of DMI with enteric methane emission in lactating dairy cows when measured using the GreenFeed system (GF; Symposium review: uncertainties in enteric methane inventories, measurement techniques, and prediction models. Journal of Dairy Science 101, 6655 to 6674). Therefore, we examined this relationship in a 15-week experiment with lactating dairy cows receiving a control diet or a diet containing the investigational product 3-nitrooxypropanol (3-NOP), an enteric methane inhibitor, applied at 60 mg/kg feed DM. Daily methane emission, measured using GF, and DMI were clustered into 12 feed-intake timeslots of 2 h each. Methane emission and DMI were the lowest 2 h before feeding and the highest within 6 h after feed provision. The overall (24 h) relationship between methane emission and DMI was poor (R2 = 0.01). The relationship for the control (but not 3-NOP) cows was improved (R2 = 0.31; P < 0.001) when DMI was allocated to timeslots and was strongest (R2 = 0.51; P < 0.001) 8 to 10 h after feed provision. Analysis of the 3-NOP emission data showed marked differences in the mitigation effect over time. There was a lack of effect in the 2-h timeslot before feeding, the mitigation effect was highest (45%) immediately after feed provision, persisted at around 32% to 39% within 10 h after feed provision, and decreased to 13%, 4 h before feeding. These trends were clearly related to DMI (i.e. 3-NOP intake) by the cows. The current analysis showed that the relationship of enteric methane emission, as measured using GF, and DMI in dairy cows depends on the time of measurement relative to time of feeding. The implication of this finding is that a sufficient number of observations, covering the entire 24-h feeding cycle, have to be collected to have representative emission estimates using the GF system. This analysis also revealed that the methane mitigation effect of 3-NOP is highest immediately after feed provision and lowest before feeding.
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UR - http://www.scopus.com/inward/citedby.url?scp=85091125949&partnerID=8YFLogxK
U2 - 10.1017/S1751731120001731
DO - 10.1017/S1751731120001731
M3 - Article
C2 - 32720629
AN - SCOPUS:85091125949
SN - 1751-7311
VL - 14
SP - s484-s490
JO - Animal
JF - Animal
ER -