Animal factors that affect enteric methane production measured using the GreenFeed monitoring system in grazing dairy cows.

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dc.citation.issue5
dc.citation.volume107
dc.contributor.authorStarsmore K
dc.contributor.authorLopez-Villalobos N
dc.contributor.authorShalloo L
dc.contributor.authorEgan M
dc.contributor.authorBurke J
dc.contributor.authorLahart B
dc.coverage.spatialUnited States
dc.date.accessioned2024-12-10T21:25:49Z
dc.date.available2024-12-10T21:25:49Z
dc.date.issued2024-04-16
dc.description.abstractSimilar to all dairy systems internationally, pasture-based dairy systems are under increasing pressure to reduce their greenhouse gas (GHG) emissions. Ireland and New Zealand are 2 countries operating predominantly pasture-based dairy production systems where enteric CH4 contributes 23% and 36% of total national emissions, respectively. Ireland currently has a national commitment to reduce 51% of total GHG emissions by 2030 and 25% from agriculture by 2030, as well as striving to achieve climate neutrality by 2050. New Zealand's national commitment is to reduce 10% of methane emissions by 2030 and between 24% and 47% reduction in methane emissions by 2050. To achieve these reductions, factors that affect enteric methane (CH4) production in a pasture-based system need to be investigated. The objective of this study was to assess the relationship between enteric CH4 and other animal traits (feed intake, metabolic liveweight, energy corrected milk yield, milk urea concentration, and body condition score [BCS]) in a grazing dairy system. Enteric CH4 emissions were measured on 45 late lactation (213.8 ± 29 d after calving) grazing Holstein-Friesian and Holstein-Friesian × Jersey crossbred cows (lactation number 3.01 ± 1.65, 538.64 ± 59.37 kg live weight, and 3.14 ± 0.26 BCS) using GreenFeed monitoring equipment for 10 wk. There was a training period for the cows to use the GreenFeed of 3 wk before the 10-wk study period. The average enteric CH4 produced in the study was 352 g ± 45.7 g per day with an animal to animal coefficient of variation of 13%. Dry matter intake averaged 16.6 kg ± 2.23 kg per day, while milk solids (fat plus protein) averaged 1.62 kg ± 0.29 kg per day. A multiple linear regression model indicated that each one unit increase in energy corrected milk yield, metabolic liveweight and milk urea concentration, resulted in an increase in enteric CH4 production per day by 3.9, 1.74, and 1.38 g, respectively. Although each one unit increase in BCS resulted in a decrease in 39.03 g CH4 produced per day. When combined, these factors explained 47% of the variation in CH4 production, indicating that there is a large proportion of variation not included in the model. The repeatability of the CH4 measurements was 0.66 indicating that cows are relatively consistently exhibiting the same level of CH4 throughout the study. Therefore, enteric CH4 production is suitable for phenotyping.
dc.description.confidentialfalse
dc.edition.editionMay 2024
dc.format.pagination2930-2940
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/37977449
dc.identifier.citationStarsmore K, Lopez-Villalobos N, Shalloo L, Egan M, Burke J, Lahart B. (2024). Animal factors that affect enteric methane production measured using the GreenFeed monitoring system in grazing dairy cows.. J Dairy Sci. 107. 5. (pp. 2930-2940).
dc.identifier.doi10.3168/jds.2023-23915
dc.identifier.eissn1525-3198
dc.identifier.elements-typejournal-article
dc.identifier.issn0022-0302
dc.identifier.piiS0022-0302(23)00805-6
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/72255
dc.languageeng
dc.publisherElsevier B.V.
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0022030223008056
dc.relation.isPartOfJ Dairy Sci
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectenteric methane
dc.subjectgrazing dairy cows
dc.subjectgreenhouse gas emissions
dc.subjectmethane intensity
dc.subjectmethane yield
dc.subjectFemale
dc.subjectCattle
dc.subjectAnimals
dc.subjectDiet
dc.subjectMilk
dc.subjectLactation
dc.subjectMethane
dc.subjectGreenhouse Gases
dc.subjectUrea
dc.titleAnimal factors that affect enteric methane production measured using the GreenFeed monitoring system in grazing dairy cows.
dc.typeJournal article
pubs.elements-id485022
pubs.organisational-groupCollege of Health
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