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Article| Volume 80, ISSUE 8, P1674-1684, August 1997

Components of Growth in Holstein Heifers Fed Either Alfalfa or Corn Silage Diets to Produce Two Daily Gains

  • Author Footnotes
    1 Nutrient Conservation and Metabolism Laboratory.
    D.R. Waldo
    Footnotes
    1 Nutrient Conservation and Metabolism Laboratory.
    Affiliations
    Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Beltsville, MD 20705
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  • Author Footnotes
    1 Nutrient Conservation and Metabolism Laboratory.
    ,
    Author Footnotes
    2 Current address: Cooperative State Research, Education and Extension Service, Aerospace Center, Room 840, 901 D Street SW, Washington, DC 20250-2220.
    H.F. Tyrrell
    Footnotes
    1 Nutrient Conservation and Metabolism Laboratory.
    2 Current address: Cooperative State Research, Education and Extension Service, Aerospace Center, Room 840, 901 D Street SW, Washington, DC 20250-2220.
    Affiliations
    Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Beltsville, MD 20705
    Search for articles by this author
  • Author Footnotes
    3 Gene Evaluation and Mapping Laboratory.
    A.V. Capuco
    Footnotes
    3 Gene Evaluation and Mapping Laboratory.
    Affiliations
    Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Beltsville, MD 20705
    Search for articles by this author
  • Author Footnotes
    3 Gene Evaluation and Mapping Laboratory.
    C.E. Rexroad Jr.
    Footnotes
    3 Gene Evaluation and Mapping Laboratory.
    Affiliations
    Livestock and Poultry Sciences Institute, Agricultural Research Service, USDA, Beltsville, MD 20705
    Search for articles by this author
  • Author Footnotes
    1 Nutrient Conservation and Metabolism Laboratory.
    2 Current address: Cooperative State Research, Education and Extension Service, Aerospace Center, Room 840, 901 D Street SW, Washington, DC 20250-2220.
    3 Gene Evaluation and Mapping Laboratory.
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(97)76099-5
Components of Growth in Holstein Heifers Fed Either Alfalfa or Corn Silage Diets to Produce Two Daily Gains
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      Abstract

      Growth components were compared in an experiment with a 2 x 2 factorial design. Eight replicates of Holstein heifers were fed diets based on either alfalfa or corn silage for daily gain of either 725 or 950 g from 181 to 334 kg of body weight (BW). Mean daily gains from corn diets were greater than gains from alfalfa diets for BW, udder, empty body, fat, fat-free matter, protein, H2O, C, and energy but were less than gains from alfalfa for gut contents and ash. High daily gain produced higher mean values for all of these variables than did lower daily gain. The percentage of protein in fat-free matter was not affected by either main effect. The percentage of fat in empty body gain was increased as daily gain increased. Energy concentration of fat-free matter that was gained was not affected by either diet or daily gain. Energy concentration of empty body gain increased as daily gain increased. The percentage of gut contents in daily BW gain was higher for heifers fed the alfalfa diet than for those fed the corn diet. Energy concentration in daily BW gain was affected by diet and daily gain. Variations of fat and gut contents in daily BW gain must be considered when requirements or expected growth are described.

      Key words

      Abbreviation Key:

      ADG (average daily gain), ADL (acid detergent lignin), ARN (autoclaved ruminal fluid insoluble N), CEL (cellulose), DE (digestible energy), EBG (empty body gain), EBW (empty BW), EE (ether extract), FFM (fat-free matter), HEM (hemicellulose), HWIN (hot water insoluble N), ME (metabolizable energy)

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      Article info

      Publication history

      Accepted: December 6, 1996
      Received: December 27, 1995

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(97)76099-5

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

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