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Research-Article| Volume 72, ISSUE 8, P2143-2152, August 1989

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Multiphasic Analysis of Milk and Fat Yield Curves of Israeli Holsteins1

  • Author Footnotes
    2 Department of Animal Breeding, Wageningen Agricultural University, The Netherlands.
    J.A. De Boer
    Footnotes
    2 Department of Animal Breeding, Wageningen Agricultural University, The Netherlands.
    Affiliations
    Department of Animal Sciences, University of Illinois, Urbana 61801
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  • Author Footnotes
    3 On leave from the Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. Supported in part by BARD Grant US-805-84.
    J.I. Weller
    Footnotes
    3 On leave from the Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. Supported in part by BARD Grant US-805-84.
    Affiliations
    Department of Animal Sciences, University of Illinois, Urbana 61801
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  • T.A. Gipson
    Affiliations
    Department of Animal Sciences, University of Illinois, Urbana 61801
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  • Author Footnotes
    4 Reprint requests.
    M. Grossman
    Footnotes
    4 Reprint requests.
    Affiliations
    Department of Animal Sciences, University of Illinois, Urbana 61801
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  • Author Footnotes
    1 Supported in part by the Illinois Agricultural Experiment Station, Hatch 35-0306, and by the Cornell National Supercomputer Facility, Ithaca, NY.
    2 Department of Animal Breeding, Wageningen Agricultural University, The Netherlands.
    3 On leave from the Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel. Supported in part by BARD Grant US-805-84.
    4 Reprint requests.
Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(89)79339-5
Multiphasic Analysis of Milk and Fat Yield Curves of Israeli Holsteins1
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      Abstract

      A multiphasic function was fitted to first through third-parity curves for milk and fat yields of Israeli Holsteins, grouped by yield and by days open classes. A triphasic function, the sum of three logistic functions, was fitted to milk yield curves, whereas a diphasic function, the sum of two logistic functions, was fitted to fat yield curves. For first parity milk, about 5% of yield occurred in first phase, about 25% in second phase, and about 70% in third phase. For first parity fat, about 14% of yield occurred in first phase and about 86% in second phase. Effect of yield was significant for initial, peak, and 305-d yields generally. Effect of days open generally was significant for time of peak yield and duration of each phase.

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      Article info

      Publication history

      Accepted: January 20, 1989
      Received: June 16, 1988

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      DOI: https://doi.org/10.3168/jds.S0022-0302(89)79339-5

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      © 1989 American Dairy Science Association. Published by Elsevier Inc.

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