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Article| Volume 74, ISSUE 4, P1370-1381, April 1991

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Slow Release Somatotropin in Dairy Heifers and Cows Fed Two Levels of Energy Concentrate. 1. Performance and Body Condition

  • B. Remond
    Affiliations
    Laboratoire Lactation et Élevage des Ruminants, Institut National de la Recherche Agronomique, 63122 Saint-Genés-Champanelle, France
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  • Author Footnotes
    1 Present address: Laboratoire National d’élevage et de Recherches Veterinaires (Institut Senegalais de Recherches Agricoles) BP 2075, Dakar, Senegal.
    M. Cisse
    Footnotes
    1 Present address: Laboratoire National d’élevage et de Recherches Veterinaires (Institut Senegalais de Recherches Agricoles) BP 2075, Dakar, Senegal.
    Affiliations
    Laboratoire Lactation et Élevage des Ruminants, Institut National de la Recherche Agronomique, 63122 Saint-Genés-Champanelle, France
    Search for articles by this author
  • A. Ollier
    Affiliations
    Laboratoire Lactation et Élevage des Ruminants, Institut National de la Recherche Agronomique, 63122 Saint-Genés-Champanelle, France
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  • Y. Chilliard
    Affiliations
    Laboratoire Lactation et Élevage des Ruminants, Institut National de la Recherche Agronomique, 63122 Saint-Genés-Champanelle, France
    Search for articles by this author
  • Author Footnotes
    1 Present address: Laboratoire National d’élevage et de Recherches Veterinaires (Institut Senegalais de Recherches Agricoles) BP 2075, Dakar, Senegal.
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(91)78292-1
Slow Release Somatotropin in Dairy Heifers and Cows Fed Two Levels of Energy Concentrate. 1. Performance and Body Condition
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      Abstract

      Fifty-two Holstein dairy cows (27 primiparous) were used in a 2 × 2 factorial design during wk 9 to 39 of lactation to assess the effects of slow release recombinant bST (500 mg injected at 14-d intervals) and the effects of the level of energy concentrate in the diet on dairy performance. After a winter period, cows were turned out to pasture at wk 24 of lactation.
      During winter, cows given low concentrate (2.5 vs. 5.4 kg DM/d) ate signicantly more corn silage (13.9 vs. 11.9 kg DM/d), so that treatment had no significant effect an any measured parameter. The milk yield of bST-supplemented cows increased by 2.1 kg/d (11.0%) throughout the total experimental period. The response did not differ according to parity. Milk fat content and SCC were not altered, but milk protein was lower (.8 g/kg) from cows receiving bST during winter, and lactose increased (.5 g/kg). Lactation curyes of bST-supplemented cows showed a cyclic response in milk production. Gross efficiency of milk yield was improved (.18 units) by bST administration without change in diet digestibility. No difference due to bST was found in the health or reproduction of cows.
      Live weight change did not differ among the groups. Multiparous cows gained body condition (bST-supplemented animals gained less than controls: .1 vs. .7 point on a five-point scale; NS). Control primiparous cows gained body condition (.1 point) but bST-supplemented cows significantly lost body condition (1.4 point).

      Key words

      Abbreviation Key:

      PDI (protein digestible in the intestine)

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      Article info

      Publication history

      Accepted: November 2, 1990
      Received: May 29, 1990

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(91)78292-1

      Copyright

      © 1991 American Dairy Science Association. Published by Elsevier Inc.

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