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dc.contributor.authorGulati, Arunima
dc.contributor.authorGalvin, Norann
dc.contributor.authorLewis, Eva
dc.contributor.authorHennessy, Deirdre
dc.contributor.authorO'Donovan, Michael
dc.contributor.authorMcManus, Jennifer J.
dc.contributor.authorFenelon, Mark
dc.contributor.authorGuinee, Timothy P.
dc.date.accessioned2019-07-30T08:30:04Z
dc.date.available2019-07-30T08:30:04Z
dc.date.issued2017-08-15
dc.identifier.citationGalvin, N., Gulati, A., O’Donovan, M., Guinee, T. P., Lewis, E., Hennessy, D., … McManus, J. J. (2017). Outdoor grazing of dairy cows on pasture versus indoor feeding on total mixed ration: Effects on gross composition and mineral content of milk during lactation. Journal of Dairy Science, 101(3), 2710–2723. https://doi.org/10.3168/jds.2017-13338en_US
dc.identifier.urihttp://hdl.handle.net/11019/1689
dc.descriptionpeer-revieweden_US
dc.description.abstractThe influence of feeding system and lactation period on the gross composition, macroelements (Ca, P, Mg, and Na), and trace elements (Zn, Fe, Cu, Mo, Mn, Se, and Co) of bovine milk was investigated. The feeding systems included outdoor grazing on perennial ryegrass pasture (GRO), outdoor grazing on perennial ryegrass and white clover pasture (GRC), and indoors offered total mixed ration (TMR). Sixty spring-calving Holstein Friesian dairy cows were assigned to 3 herds, each consisting of 20 cows, and balanced with respect to parity, calving date, and pre-experimental milk yield and milk solids yield. The herds were allocated to 1 of the 3 feeding systems from February to November. Milk samples were collected on 10 occasions over the period June 17 to November 26, at 2 or 3 weekly intervals, when cows were on average 119 to 281 d in lactation (DIL). The total lactation period was arbitrarily sub-divided into 2 lactation periods based on DIL, namely mid lactation, June 17 to September 9 when cows were 119 to 203 DIL; and late lactation, September 22 to November 26 when cows were 216 to 281 DIL. With the exception of Mg, Na, Fe, Mo, and Co, all other variables were affected by feeding system. The GRO milk had the highest mean concentrations of total solids, total protein, casein, Ca, and P. The TMR milk had the highest concentrations of lactose, Cu, and Se, and lowest level of total protein. The GRC milk had levels of lactose, Zn, and Cu similar to those of GRO milk, and concentrations of TS, Ca, and P similar to those of TMR milk. Lactation period affected all variables, apart from the concentrations of Fe, Cu, Mn, and Se. On average, the proportion (%) of total Ca, P, Zn, Mn, or Se that sedimented with the casein on high-speed ultracentrifugation at 100,000 × g was ≥60%, whereas that of Na, Mg, or Mo was ≤45% total. The results demonstrate how the gross composition and elemental composition of milk can be affected by different feeding systems.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesJournal of Dairy Science;Vol. 101 (3)
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectpastureen_US
dc.subjecttotal mixed rationen_US
dc.subjectmilken_US
dc.subjectelementen_US
dc.titleOutdoor grazing of dairy cows on pasture versus indoor feeding on total mixed ration: Effects on gross composition and mineral content of milk during lactationen_US
dc.typeArticleen_US
dc.embargo.terms2018-08-15en_US
dc.identifier.doihttps://dx.doi.org/10.3168/jds.2017-13338
dc.contributor.sponsorDepartment of Agriculture, Food and the Marineen_US
dc.contributor.sponsorDairy Levy Trust Co-Operative Society Limiteden_US
dc.contributor.sponsorGrantNumber11/sf/309en_US
refterms.dateFOA2018-08-15T00:00:00Z


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