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Article| Volume 78, ISSUE 6, P1345-1352, June 1995

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Duodenal Infusion of Rapeseed Oil in Midlactation Cows.6. Interaction with Niacin on Dairy Performance and Nutritional Balance

  • Author Footnotes
    1 Present address: Institute of Animal and Veterinary Research, Wakwa, PO Box 65, Ngaundere, Adamawa, Cameroon.
    J.F. Ottou
    Footnotes
    1 Present address: Institute of Animal and Veterinary Research, Wakwa, PO Box 65, Ngaundere, Adamawa, Cameroon.
    Affiliations
    Laboratoire Sous-Nutrition des Ruminants, Institut National de la Recherche Agronomique, Theix, 63122 Saint Genés Champanelle, France
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  • M. Doreau
    Affiliations
    Laboratoire Sous-Nutrition des Ruminants, Institut National de la Recherche Agronomique, Theix, 63122 Saint Genés Champanelle, France
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  • Y. Chilliard
    Correspondence
    Correspondence and reprint requests.
    Affiliations
    Laboratoire Sous-Nutrition des Ruminants, Institut National de la Recherche Agronomique, Theix, 63122 Saint Genés Champanelle, France
    Search for articles by this author
  • Author Footnotes
    1 Present address: Institute of Animal and Veterinary Research, Wakwa, PO Box 65, Ngaundere, Adamawa, Cameroon.
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      Abstract

      Rapeseed oil and niacin, alone or in combination, were infused continuously into the proximal duodenum of ruminally and duodenally fistulated midlactation cows in a 4 × 4 Latin square design. Although niacin in plasma was higher for cows infused with niacin no significant effect occurred on milk production and composition. When cows were infused with oil, milk production and fat content were unchanged, milk protein content was decreased, and lactose content was increased. The magnitude of decrease in the percentage of mediumchain fatty acids in milk of cows infused with oil was similar to the magnitude of the increase in the long-chain fatty acids of milk. Except for the decrease in milk C4:0 and the increase in C14:0 and C14:1 percentages, niacin did not exert a significant influence on the fatty acid profile of milk. Oil-free DMI tended to decrease in the cows that were infused with oil, but nutrient digestibility was unchanged with all infusates. Energy and protein intake and energy balance were similar, but protein balance tended to be higher with oil infusion. However, body condition score was decreased by oil infusion.
      For midlactation cows that received oil infusion, the limitation in DMI or the direct effect of absorbed fatty acids limited milk protein synthesis and body condition score. Effectiveness of postrumind niacin (alone or with oil) at midlactation is questioned.

      Key words

      Abbreviation key:

      BCS (body condition score), FA (fatty acids), NA (niacin), PDI (protein digestible in the intestine), RO (rapeseed oil)

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