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dc.contributor.authorUpton, J.
dc.contributor.authorPenry, J.F.
dc.contributor.authorRasmussen, M.D.
dc.contributor.authorThompson, P.D.
dc.contributor.authorReinemann, D.J.
dc.date.accessioned2023-10-09T13:45:29Z
dc.date.available2023-10-09T13:45:29Z
dc.date.issued2016-05-31
dc.identifier.citationJ. Upton, J.F. Penry, M.D. Rasmussen, P.D. Thompson, D.J. Reinemann, Effect of pulsation rest phase duration on teat end congestion, Journal of Dairy Science, Volume 99, Issue 5, 2016, Pages 3958-3965, ISSN 0022-0302, https://doi.org/10.3168/jds.2015-10466.en_US
dc.identifier.urihttp://hdl.handle.net/11019/3306
dc.descriptionpeer-revieweden_US
dc.description.abstractThe objective of this study was to quantify the effect of d-phase (rest phase) duration of pulsation on the teat canal cross-sectional area during the period of peak milk flow from bovine teats. A secondary objective was to test if the effect of d-phase duration on teat canal cross-sectional area was influenced by milking system vacuum level, milking phase (b-phase) duration, and liner overpressure. During the d-phase of the pulsation cycle, liner compression facilitates venous flow and removal of fluids accumulated in teat-end tissues. It was hypothesized that a short-duration d-phase would result in congestion of teat-end tissue and a corresponding reduction in the cross-sectional area of the teat canal. A quarter milking device, designed and built at the Milking Research and Instruction Laboratory at the University of Wisconsin–Madison, was used to implement an experiment to test this hypothesis. Pulsator rate and ratios were adjusted to achieve 7 levels of d-phase duration: 50, 100, 150, 175, 200, 250, and 300ms. These 7 d-phase durations were applied during one milking session and were repeated for 2 vacuum levels (40 and 50kPa), 2 milking phase durations (575 and 775ms), and 2 levels of liner overpressure (9.8 and 18kPa). We observed a significant reduction in the estimated cross-sectional area of the teat canal with d-phase durations of 50 and 100ms when compared with d-phase durations of 150, 175, 225, 250, and 300ms. No significant difference was found in the estimated cross-sectional area of the teat canal for d-phase durations from 150 to 300ms. No significant interaction was observed between the effect of d-phase and b-phase durations, vacuum level, or liner overpressure.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesJournal of Dairy Science;Vol 99
dc.rights© 2016 American Dairy Science Association®.
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/*
dc.subjectmilkingen_US
dc.subjectpulsationen_US
dc.subjectteat congestionen_US
dc.subjectmilk flowen_US
dc.titleEffect of pulsation rest phase duration on teat end congestionen_US
dc.typeArticleen_US
dc.identifier.doihttps://doi.org/10.3168/jds.2015-10466
dc.contributor.sponsorUniversity of Wisconsinen_US
dc.contributor.sponsorTeagascen_US
dc.contributor.sponsorAvon Dairy Solutionsen_US
dc.contributor.sponsorDairy Australiaen_US
dc.source.volume99
dc.source.issue5
dc.source.beginpage3958
dc.source.endpage3965
refterms.dateFOA2023-10-09T13:45:30Z
dc.source.journaltitleJournal of Dairy Science


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© 2016 American Dairy Science Association®.
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