Bioactive metabolites of Asparagopsis stabilized in canola oil completely suppress methane emissions in beef cattle fed a feedlot diet

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dc.citation.volume102
dc.contributor.authorCowley FC
dc.contributor.authorKinley RD
dc.contributor.authorMackenzie SL
dc.contributor.authorFortes MRS
dc.contributor.authorPalmieri C
dc.contributor.authorSimanungkalit G
dc.contributor.authorAlmeida AK
dc.contributor.authorRoque BM
dc.coverage.spatialUnited States
dc.date.accessioned2024-09-29T22:08:03Z
dc.date.available2024-09-29T22:08:03Z
dc.date.issued2024-04-22
dc.description.abstractAsparagopsis taxiformis (Asparagopsis) has been shown to be highly efficacious at inhibiting the production of methane (CH4) in ruminants. To date, Asparagopsis has been primarily produced as a dietary supplement by freeze-drying to retain the volatile bioactive compound bromoform (CHBr3) in the product. Steeping of Asparagopsis bioactive compounds into a vegetable oil carrier (Asp-Oil) is an alternative method of stabilizing Asparagopsis as a ruminant feed additive. A dose-response experimental design used 3 Asp-Oil-canola oil blends, low, medium, and high Asp-Oil which provided 17, 34, and 51 mg Asparagopsis derived CHBr3/kg dry matter intake (DMI), respectively (in addition to a zero CHBr3 canola oil control), in a tempered-barley based feedlot finisher diet, fed for 59 d to 20 Angus heifers (five replicates per treatment). On four occasions, live weight was measured and CH4 emissions were quantified in respiration chambers, and blood, rumen fluid, and fecal samples were collected. At the end of the experiment, all animals were slaughtered, with carcasses graded, and samples of meat and edible offal collected for testing of consumer sensory qualities and residues of CHBr3, bromide, and iodide. All Asp-Oil treatments reduced CH4 yield (g CH4/kg DMI, P = 0.008) from control levels, with the low, medium, and high Asp-Oil achieving 64%, 98%, and 99% reduction, respectively. Dissolved hydrogen increased linearly with increasing Asp-Oil inclusion, by more than 17-fold in the high Asp-Oil group (P = 0.017). There was no effect of Asp-Oil treatment on rumen temperature, pH, reduction potential, volatile fatty acid and ammonia production, rumen pathology, and histopathology (P > 0.10). There were no differences in animal production and carcass parameters (P > 0.10). There was no detectable CHBr3 in feces or any carcass samples (P > 0.10), and iodide and bromide residues in kidneys were at levels unlikely to lead to consumers exceeding recommended maximum intakes. Overall, Asp-Oil was found to be safe for animals and consumers of meat, and effective at reducing CH4 emissions and yield by up to 99% within the range of inclusion levels tested.
dc.description.confidentialfalse
dc.format.paginationskae109-
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/38646666
dc.identifier.citationCowley FC, Kinley RD, Mackenzie SL, Fortes MRS, Palmieri C, Simanungkalit G, Almeida AK, Roque BM. (2024). Bioactive metabolites of Asparagopsis stabilized in canola oil completely suppress methane emissions in beef cattle fed a feedlot diet.. J Anim Sci. 102. (pp. skae109-).
dc.identifier.doi10.1093/jas/skae109
dc.identifier.eissn1525-3163
dc.identifier.elements-typejournal-article
dc.identifier.issn0021-8812
dc.identifier.pii7655728
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71529
dc.languageeng
dc.publisherOxford University Press on behalf of the American Society of Animal Science.
dc.publisher.urihttps://academic.oup.com/jas/article/doi/10.1093/jas/skae109/7655728
dc.relation.isPartOfJ Anim Sci
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectAsparagopsis
dc.subjectcarbon neutral initiatives
dc.subjectmethanogenesis
dc.subjectred seaweed
dc.subjectrumen fermentation
dc.subjectsustainability
dc.subjectAnimals
dc.subjectCattle
dc.subjectAnimal Feed
dc.subjectMethane
dc.subjectDiet
dc.subjectRapeseed Oil
dc.subjectFemale
dc.subjectDietary Supplements
dc.subjectRumen
dc.subjectPlant Oils
dc.titleBioactive metabolites of Asparagopsis stabilized in canola oil completely suppress methane emissions in beef cattle fed a feedlot diet
dc.typeJournal article
pubs.elements-id489077
pubs.organisational-groupOther
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