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dc.contributor.author
Pozo, Claudio
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dc.contributor.author
Kozloski, Gilberto V.
dc.contributor.author
Cuffia, Maira
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dc.contributor.author
Repetto, José L.
dc.contributor.author
Cajarville, Cecilia
dc.date.available
2024-01-24T13:41:21Z
dc.date.issued
2022-06
dc.identifier.citation
Pozo, Claudio; Kozloski, Gilberto V.; Cuffia, Maira; Repetto, José L.; Cajarville, Cecilia; Changing the grazing session from morning to afternoon or including tannins in the diet was effective in decreasing the urinary nitrogen of dairy cows fed a total mixed ration and herbage; American Dairy Science Association; Journal of Dairy Science; 105; 6; 6-2022; 4987-5003
dc.identifier.issn
0022-0302
dc.identifier.uri
http://hdl.handle.net/11336/224694
dc.description.abstract
Our aim was to evaluate whether increasing soluble carbohydrates in the herbage by changing the time of the grazing session or including Acacia mearnsii tannin in the diet would affect intake, digestion, N partitioning, and productive performance of dairy cows fed a diet combining ryegrass herbage with partial total mixed ration (PMR). We hypothesized that both strategies could reduce the concentration of NH3-N in the rumen, reducing urinary N excretion. Nine Holstein cows were used in a triplicate 3 × 3 Latin square experiment with 3 experimental periods of 22 d. The cows were fed a fixed amount of PMR [60% of the predicted individual dry matter intake (DMI)], and an unrestricted amount of herbage in 1 grazing session of 5 h/d. The treatments were (1) morning grazing session and afternoon PMR meal (AM); (2) morning PMR meal and afternoon grazing session (PM); and (3) morning grazing session and afternoon PMR meal supplemented with 15.0 g of tannins/kg of PMR dry matter (TAN). Milk production was not affected by treatments. Although the protein concentration was lower for TAN than for PM, no differences were detected for the yield of any component between treatments. The concentration of individual or grouped fatty acids in milk fat was not affected by treatments, except for 16:1 cis-9 and Δ9-desaturase ratios 14:1/14:0 and 16:1/16:0, which were lower for TAN. Treatments did not affect total DMI, but PM tended to increase herbage DMI and reduce dry matter and crude protein digestibilities. Treatments did not affect cow eating and ruminating behavior except for the proportion of time spent eating PMR, which was higher for PM and TAN. Although no relevant effects of treatments on ruminal fermentation, purine derivatives excretion in urine, or N excretion in milk were detected, both PM and TAN decreased the total N excreted in urine by an average of 8% compared with AM. In conclusion, changing the grazing session from the morning to the afternoon and including tannins in the diet were effective in decreasing the excretion of urinary N but did not change the productive performance of dairy cows fed PMR and ryegrass herbage.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Dairy Science Association
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
LOLIUM MULTIFLORUM
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MILK PRODUCTION
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N EXCRETION
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TANNIN
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TIME OF GRAZING
dc.subject.classification
Producción Animal y Lechería
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dc.subject.classification
Producción Animal y Lechería
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dc.subject.classification
CIENCIAS AGRÍCOLAS
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dc.title
Changing the grazing session from morning to afternoon or including tannins in the diet was effective in decreasing the urinary nitrogen of dairy cows fed a total mixed ration and herbage
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-01-16T10:42:57Z
dc.journal.volume
105
dc.journal.number
6
dc.journal.pagination
4987-5003
dc.journal.pais
Estados Unidos
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dc.journal.ciudad
Champaign
dc.description.fil
Fil: Pozo, Claudio. Universidade Federal de Santa Maria; Brasil
dc.description.fil
Fil: Kozloski, Gilberto V.. Universidade Federal de Santa Maria; Brasil
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Fil: Cuffia, Maira. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Repetto, José L.. Universidad de la República; Uruguay
dc.description.fil
Fil: Cajarville, Cecilia. Universidad de la República; Uruguay
dc.journal.title
Journal of Dairy Science
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3168/jds.2021-21149
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022030222002247
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