Journal of Dairy Science
Volume 91, Issue 1 , Pages 85-90 , January 2008

Effect of Prepartum Photoperiod on Milk Production and Prolactin Concentration of Dairy Ewes

  • C.M. Mikolayunas

      Affiliations

    • Department of Animal Sciences, University of Wisconsin-Madison, Madison 53706
    • Corresponding Author InformationCorresponding author.
    • ,
  • D.L. Thomas

      Affiliations

    • Department of Animal Sciences, University of Wisconsin-Madison, Madison 53706
    • ,
  • G.E. Dahl

      Affiliations

    • Department of Animal Sciences, University of Illinois, Urbana 61801
    • Current address: Department of Animal Sciences, University of Florida, Gainesville 32611.
    • ,
  • T.F. Gressley

      Affiliations

    • Department of Animal Sciences, University of Illinois, Urbana 61801
    • Current address: Department of Animal and Food Sciences, University of Delaware, Newark 19716.
    • ,
  • Y.M. Berger

      Affiliations

    • Spooner Agricultural Research Station, University of Wisconsin-Madison, Spooner 54801

Received 7 August 2007 ,Accepted 28 May 2008.

  • Image Result

    Mean test day milk yield during the trial period of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light:8h of dark;

    Mean test day milk yield during the trial period of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light:8h of dark; □). The table presents the number of ewes per treatment (n) on each test day relative to DIM. Error bars indicate SEM.

  • Image Result
    Mean fat and protein percentage during the trial period of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light:8h o

    Mean fat and protein percentage during the trial period of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light:8h of dark; □). The table presents the number of ewes per treatment (n) relative to week of lactation. Error bars indicate SEM.

  • Image Result
    Mean concentration of plasma prolactin of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light: 8h of dark; □). The

    Mean concentration of plasma prolactin of ewes exposed to short day prepartum photoperiod (SDPP; 8h of light:16h of dark; ■) or long day prepartum photoperiod (LDPP; 16h of light: 8h of dark; □). The table presents the number of ewes per treatment (n) on each week relative to lambing. Error bars indicate SEM. *Least squares means within a test day are different (P<0.05). **Least squares means within a test day are different (P<0.01).

PII: S0022-0302(08)71440-1

doi: 10.3168/jds.2007-0586

Journal of Dairy Science
Volume 91, Issue 1 , Pages 85-90 , January 2008

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