DETERMINATION OF OPTIMAL DCAD CONCENTRATION AND RELATIVE EFFECTIVENESS OF POTASSIUM VERSUS SODIUM CATION SUPPLEMENTATION FOR MAXIMAL FEED EFFICIENCY IN LACTATING DAIRY COWS

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dc.contributor.advisorErdman, Richarden_US
dc.contributor.authorIwaniuk, Marie Elizabethen_US
dc.contributor.departmentAnimal Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2014-02-04T06:31:08Z
dc.date.available2014-02-04T06:31:08Z
dc.date.issued2013en_US
dc.description.abstractThe objective was to determine the optimal dietary cation-anion difference (DCAD) required to maximize 3.5% fat-corrected milk (FCM) and feed efficiency (FE; FCM per dry matter intake (DMI)) in lactating dairy cows. When potassium carbonate was added resulting in four dietary treatments: 250, 300, 350, and 400 meq/kg DCAD, increasing DCAD linearly increased FCM and FE suggesting an optimal DCAD of at least 400 meq/kg. In a subsequent study comparing the relative effectiveness of potassium versus sodium, cation source had no effect on DMI or FCM. However, milk fat percentage and FE were highest when sodium was used as the sole cation source. Finally, surface response equations developed from literature data showed that DMI, FCM, milk fat %, rumen pH, and fiber digestibility increased linearly with DCAD. This suggested that improved FE was a function of improved rumen function, energy availability, and partitioning of absorbed energy toward milk energy.en_US
dc.identifier.urihttp://hdl.handle.net/1903/14771
dc.language.isoenen_US
dc.subject.pqcontrolledAnimal sciencesen_US
dc.subject.pqcontrolledNutritionen_US
dc.subject.pquncontrolledDairy cowen_US
dc.subject.pquncontrolledDCADen_US
dc.subject.pquncontrolledFeed Efficiencyen_US
dc.subject.pquncontrolledPotassiumen_US
dc.subject.pquncontrolledSodiumen_US
dc.titleDETERMINATION OF OPTIMAL DCAD CONCENTRATION AND RELATIVE EFFECTIVENESS OF POTASSIUM VERSUS SODIUM CATION SUPPLEMENTATION FOR MAXIMAL FEED EFFICIENCY IN LACTATING DAIRY COWSen_US
dc.typeThesisen_US

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