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Article| Volume 80, ISSUE 8, P1666-1673, August 1997

Nutrient Fluxes in Splanchnic Tissue of Dairy Cows: Influence of Grass Quality

  • Author Footnotes
    2 Department of Ruminant Nutrition.
    H. De Visser
    Correspondence
    Address correspondence and reprint requests to H. de Visser, Institute for Animal Science and Health (Instituut voor Dierhouderij en Diergezondheid–Dienst Landbouwkundig Onderzoek), Department of Ruminant Nutrition, PO Box 65, 8200 AB, Lelystad, The Netherlands.
    Footnotes
    2 Department of Ruminant Nutrition.
    Affiliations
    Dienst Landbouwkundig Onderzoek, Instituut voor Dierhouderij en Diergezondheid, PO Box 65, 8200 AB, Lelystad, The Netherlands
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  • Author Footnotes
    2 Department of Ruminant Nutrition.
    H. Valk
    Footnotes
    2 Department of Ruminant Nutrition.
    Affiliations
    Dienst Landbouwkundig Onderzoek, Instituut voor Dierhouderij en Diergezondheid, PO Box 65, 8200 AB, Lelystad, The Netherlands
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  • Author Footnotes
    2 Department of Ruminant Nutrition.
    A. Klop
    Footnotes
    2 Department of Ruminant Nutrition.
    Affiliations
    Dienst Landbouwkundig Onderzoek, Instituut voor Dierhouderij en Diergezondheid, PO Box 65, 8200 AB, Lelystad, The Netherlands
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  • Author Footnotes
    3 Department of Nutrition of Pigs and Poultry.
    J. Van Der Meulen
    Footnotes
    3 Department of Nutrition of Pigs and Poultry.
    Affiliations
    Dienst Landbouwkundig Onderzoek, Instituut voor Dierhouderij en Diergezondheid, PO Box 65, 8200 AB, Lelystad, The Netherlands
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  • Author Footnotes
    3 Department of Nutrition of Pigs and Poultry.
    J.G.M. Bakker
    Footnotes
    3 Department of Nutrition of Pigs and Poultry.
    Affiliations
    Dienst Landbouwkundig Onderzoek, Instituut voor Dierhouderij en Diergezondheid, PO Box 65, 8200 AB, Lelystad, The Netherlands
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  • G.B. Huntington
    Affiliations
    104 Trotter's Ridge Drive, Raleigh, NC 27614
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  • Author Footnotes
    2 Department of Ruminant Nutrition.
    3 Department of Nutrition of Pigs and Poultry.
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(97)76098-3
Nutrient Fluxes in Splanchnic Tissue of Dairy Cows: Influence of Grass Quality
Previous ArticleEffects of Dietary Forage Source and Amount of Forage Addition on Intake, Milk Yield, and Digestion for Lactating Dairy Cows
Next ArticleComponents of Growth in Holstein Heifers Fed Either Alfalfa or Corn Silage Diets to Produce Two Daily Gains
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      Abstract

      A crossover design was used to investigate the effects of high (450 kg of N/ha) or low (150 kg of N/ha) N fertilization of ryegrass on fermentation and nutrient fluxes in splanchnic tissue of dairy cows fed those grasses. Grass that was fertilized with the high amount of N contained more N and less sugar than did grass that was fertilized with less N. In rumen fluid, the concentration of NH3 N was lower for ryegrass that was fertilized with the low amount of N. The NH3 release by portal-drained viscera and urea synthesis in the liver were higher for cows fed ryegrass that was fertilized with the high amount of N.
      The concentration of NH3 N in rumen fluid, NH3 N release in portal-drained viscera, urea synthesis in the liver, urea release from the liver, and urea concentrations in milk were highly correlated. The release of acetate and propionate in portal-drained viscera was similar for both grasses and was well correlated with the proportion of volatile fatty acids in rumen fluid. The proportion of butyrate in rumen fluid was closely correlated with the release of butyrate and β-hydroxybutyrate in portal-drained viscera. Glucose synthesis in the liver indicated gluconeogenesis from amino acids, which corresponded well with urea synthesis in the liver. For the grass fertilized with more N, availability of energy sources for rumen microbes was low, and, therefore, cows did not use the N in that grass efficiently.

      Key words

      Abbreviation Key:

      FOM (rumen-fermentable OM), FOMVFA (FOM available for VFA production), HN (high N fertilization), IDP (intestinal digestible protein), LN (low N fertilization), NE (net energy), PDV (portal-drained viscera), RPB (rumen protein balance)

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      Article info

      Publication history

      Accepted: December 19, 1996
      Received: March 14, 1996

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(97)76098-3

      Copyright

      © 1997 American Dairy Science Association. Published by Elsevier Inc.

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