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dc.contributor.authorPatton, Joe*
dc.contributor.authorMurphy, J.J.*
dc.contributor.authorO'Mara, Frank P.*
dc.contributor.authorButler, Stephen*
dc.date.accessioned2012-12-17T16:08:48Z
dc.date.available2012-12-17T16:08:48Z
dc.date.issued2008-06
dc.identifier.citationJ. Patton, J. J. Murphy, F. P. O’Mara and S. T. Butler (2008). A comparison of energy balance and metabolic profiles of theNew Zealand and North American strains of Holstein Friesian dairy cow. Animal, 2, pp 969-978.doi:10.1017/S1751731108001973en_GB
dc.identifier.issn1751-732X
dc.identifier.urihttp://hdl.handle.net/11019/304
dc.descriptionpeer-revieweden_GB
dc.description.abstractThe milk production, energy balance (EB), endocrine and metabolite profiles of 10 New Zealand Holstein Friesian (NZ) cows and 10 North American Holstein Friesian (NA) cows were compared. The NA cows had greater peak milk yields and total lactation milk yields (7387 v. 6208 kg; s.e.d.5359), lower milk fat and similar protein concentrations compared with the NZ cows. Body weight (BW) was greater for NA cows compared with NZ cows throughout lactation (596 v. 544 kg; s.e.d.515.5), while body condition score (BCS) tended to be lower. The NA strain tended to have greater dry matter intake (DMI) (17.2 v. 15.7 kg/day; s.e.d.50.78) for week 1 to 20 of lactation, though DMI as a proportion of metabolic BW was similar for both strains. No differences were observed between the strains in the timing and magnitude of the EB nadir, interval to neutral EB, or mean daily EB for week 1 to 20 of lactation. Plasma concentrations of glucose and insulin were greater for NA cows during the transition period (day 14 pre partum to day 28 post partum). Plasma IGF-I concentrations were similar for the strains at this time, but NZ cows had greater plasma IGF-I concentration from day 29 to day 100 of lactation, despite similar calculated EB. In conclusion, the results of this study do not support the premise that the NZ strain has a more favourable metabolic status during the transition period. The results, however, indicate that NZ cows begin to partition nutrients towards body reserves during mid-lactation, whereas NA cows continue to partition nutrients to milk production.en_GB
dc.language.isoenen_GB
dc.publisherCambridge University Pressen_GB
dc.relation.ispartofseriesAnimal: The International Journal of Animal Biosciences;vol. 2
dc.subjectDairy cowsen_GB
dc.subjectEnergy balanceen_GB
dc.subjectGenetic selectionen_GB
dc.subjectNutrient partitioningen_GB
dc.titleA comparison of energy balance and metabolic profiles of the New Zealand and North American strains of Holstein Friesian dairy cowen_GB
dc.typeArticleen_GB
dc.identifier.rmis5397
dc.identifier.doihttp://dx.doi.org/10.1017/S1751731108001973
dc.contributor.sponsorNational Development Plan Ireland
refterms.dateFOA2018-01-12T07:44:40Z


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