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dc.contributor.authorde Feu, M.A.*
dc.contributor.authorEvans, A.C.O.*
dc.contributor.authorLonergan, P.*
dc.contributor.authorButler, Stephen*
dc.date.accessioned2012-10-16T11:02:35Z
dc.date.available2012-10-16T11:02:35Z
dc.date.issued2009-12
dc.identifier.citationM.A. de Feu, A.C.O. Evans, P. Lonergan, S.T. Butler. The effect of dry period duration and dietary energy density on milk production, bioenergetic status, and postpartum ovarian function in Holstein-Friesian dairy cows. Journal of Dairy Science, 92 (12), December 2009: 6011-6022. DOI:10.3168/jds.2009-2374en_GB
dc.identifier.issn0022-0302
dc.identifier.urihttp://hdl.handle.net/11019/222
dc.descriptionPeer-reviewed.
dc.descriptionThis is the author’s version of a work that was accepted for publication in Journal of Dairy Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Dairy Science, 92(12), Dec 2009. DOI: 10.3168/jds.2009-2374
dc.description.abstractFollowing parturition, it is typical for dairy cows to enter a period of negative energy balance (NEB) and body condition loss to support mammary milk synthesis, and this is associated with compromised reproductive performance. Alternative management strategies during the prepartum (dry) and early post partum periods may ameliorate this. Forty mature Holstein-Friesian cows were assigned to one of two dry period treatments (standard 8 week dry period (SDP) or no planned dry period (NDP)) and one of two dietary energy density treatments (standard TMR (STMR) or high quality TMR (HTMR)). Milk yield during weeks 1 to 12 postpartum was reduced (P = 0.01) in cows assigned to the NDP treatment. Energy balance (P < 0.001) and body condition score (P = 0.07) during weeks 1 to 4 postpartum were increased in cows assigned to the NDP treatment compared to the cows assigned to the SDP, and BCS increased (P<0.001) from weeks 5 to 12 postpartum in the NDP cows compared to the SDP cows. During the first 12 weeks postpartum, cows assigned to the HTMR had greater (P = 0.02) milk yields and reduced (P < 0.001) milk fat concentration compared to the cows assigned the STMR diet. BCS was greater (P = 0.01) from weeks 5 to 12 postpartum in HTMR cows compared to STMR cows. During the period from weeks -3 to +3 relative to parturition, circulating concentrations of insulin (P = 0.001), glucose (P < 0.001) and IGF-I (P = 0.004) were greater in cows on the NDP treatment compared to cows on the SDP treatment. Cows assigned to the HTMR had greater circulating insulin (P = 0.04) and glucose (P = 0.001) concentrations compared to the STMR cows from weeks -3 to +3 relative to parturition. The first postpartum ovulation occurred earlier for cows on the NDP treatment compared to cows on the SDP treatment (16.9 vs. 24.8 days postpartum; P = 0.02). Cows assigned to the STMR tended to have a higher conception rate to first service (P = 0.07) compared to cows assigned to the HTMR. Energy balance and metabolic status can be improved by either eliminating the dry period or by feeding a higher energy diet, but effects on the reproductive axis appear to be different.en_GB
dc.language.isoenen_GB
dc.publisherAmerican Dairy Science Association and Elsevier Inc.en_GB
dc.relation.ispartofseriesJournal of Dairy Science;vol. 92
dc.subjectdry perioden_GB
dc.subjectfeeding levelen_GB
dc.subjectenergy balanceen_GB
dc.subjectresumption of cyclicityen_GB
dc.titleThe effect of dry period duration and dietary energy density on milk production, bioenergetic status and postpartum ovarian function in Holstein-Friesian dairy cowsen_GB
dc.typeArticleen_GB
dc.identifier.rmis5397
dc.identifier.doihttp://dx.doi.org/10.3168/jds.2009-2374
dc.contributor.sponsorNational Development Plan
refterms.dateFOA2018-01-12T07:37:40Z


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