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    • Graduate School - MU Theses and Dissertations (MU)
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    • 2013 Dissertations (MU)
    • 2013 MU dissertations - Freely available online
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    Effect of commercial feed additives on production variables and metabolic markers of the periparturient dairy cow

    Barkley, Nicole Marie
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    [PDF] Full dissertation (1.184Mb)
    [PDF] Abstract (2.100Kb)
    [PDF] Abstract (67.74Kb)
    Date
    2013
    Format
    Thesis
    Metadata
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    Abstract
    Three experiments were conducted to investigate the effects of commercially available feed additives on production variables and metabolic markers when supplemented during the periparturient period. The hypothesis was that the supplementation of feed additives throughout the periparturient period would improve production variables and metabolic markers. Feed additives investigated included a mixture of B-vitamins and active dried yeast, organically complexed trace minerals, and a yeast culture. For all experiments, the variables of interest included daily dry matter intake, milk yield, and feed efficiency as well as weekly body condition score, body weight, milk composition, 3.5% fat-corrected milk, energy-corrected milk (ECM), and colostrum immunoglobulin concentrations as measures of production performance. Plasma glucose, nonesterified fatty acids , and [beta]-hydroxybutyrate were examined in all experiments as markers of metabolic health. Data to support feeding the B-vitamin and active dried yeast mixture or the organically complexed trace minerals during the periparturient period were limited. Increased milk fat and protein yield as well as ECM efficiency results led to the conclusion that supplementation of yeast culture at the suggested rate of 56 g/d would be beneficial to producers, however; it did not improve the periparturient cow's metabolic health markers that were examined in the current study.
    URI
    https://hdl.handle.net/10355/42632
    https://doi.org/10.32469/10355/42632
    Degree
    Ph. D.
    Thesis Department
    Animal sciences (MU)
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
    Collections
    • 2013 MU dissertations - Freely available online
    • Animal Sciences electronic theses and dissertations (MU)

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