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dc.contributor.author
Kapp-Bitter, Alexandra N.
dc.contributor.author
Dickhoefer, Uta
dc.contributor.author
Kreuzer, Michael
dc.contributor.author
Leiber, Florian
dc.date.accessioned
2021-03-26T11:10:40Z
dc.date.available
2020-12-29T03:31:27Z
dc.date.available
2021-01-06T15:06:47Z
dc.date.available
2021-03-26T11:10:40Z
dc.date.issued
2021
dc.identifier.issn
1836-0939
dc.identifier.issn
1836-5787
dc.identifier.other
10.1071/AN20323
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/458659
dc.identifier.doi
10.3929/ethz-b-000458659
dc.description.abstract
Context: High concentrations of crude protein in ruminant diets may lead to excessive production of ruminal ammonia, which may stress the animal’s metabolism and impact nitrogen efficiency. This may become a problem in zero-concentrate feeding systems when pasture grass is rich in crude protein. Polyphenols such as tannins may protect part of dietary protein from ruminal degradation and thus inhibit ammonia formation. Aims: The present study screened mature herbs for their potential to mitigate ruminal ammonia formation in cattle, when provided as a supplement to a forage diet. Methods: Thirty-five temperate-climate, herbaceous meadow plant species (including three legumes) that appear in biodiverse natural and sown pastures were investigated for their effects on ruminal ammonia production. Aboveground material was harvested during ripening of the seeds and analysed for nutrient and phenol concentrations. Net energy and protein absorbable at the duodenum were calculated. Incubations (24 h) with cattle rumen fluid following the in vitro Hohenheim Gas Test protocol were performed to compare the effects of the test plants on ruminal gas and ammonia formation. Test plants replaced one-third of a basal mixture consisting of 57% Lolium perenne L. and 43% Medicago sativa L. (air-dry-matter basis). Results were compared with those obtained with the basal mixture alone. Key results: According to regression analysis, ammonia concentration after incubation was negatively related to concentrations of total extractable phenols and total tannins in feed mixtures, whereas the relationship was weakly positive with dietary crude protein. In 23 and 19 of the test diets, respectively, in vitro gas production (indicating ruminal organic matter digestibility) and ammonia concentrations in the incubation medium after 24 h were significantly lower than with the basal mixture alone. Incubations containing Galium verum L., Leontodon hispidus L., Lotus corniculatus L., Onobrychis viciifolia Scop., Plantago lanceolata L., Sanguisorba minor Scop. and Scabiosa columbaria L. maintained gas production and estimated in vitro organic matter digestibility while at the same time lowering ammonia concentrations. Conclusions: Seven mature herbs of a screening of 35 proved to have potential for positive effects on ruminal protein utilisation without impairing fermentation. Implications: These herbs are of particular interest as dietary supplements for dairy cows grazing protein-rich pastures.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
CSIRO
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Condensed tannins
en_US
dc.subject
Forbs
en_US
dc.subject
Hydrolysable tannins
en_US
dc.subject
Plant secondary compounds
en_US
dc.subject
Protein efficiency
en_US
dc.title
Mature herbs as supplements to ruminant diets: effects on in vitro ruminal fermentation and ammonia production
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2020-12-14
ethz.journal.title
Animal Production Science
ethz.journal.volume
61
en_US
ethz.journal.issue
5
en_US
ethz.journal.abbreviated
Anim. Prod. Sci.
ethz.pages.start
470
en_US
ethz.pages.end
479
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Collingwood
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03428 - Kreuzer, Michael (emeritus) / Kreuzer, Michael (emeritus)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03428 - Kreuzer, Michael (emeritus) / Kreuzer, Michael (emeritus)
ethz.date.deposited
2020-12-29T03:31:34Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-26T11:10:51Z
ethz.rosetta.lastUpdated
2022-03-29T06:03:52Z
ethz.rosetta.versionExported
true
ethz.COinS
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