Natural Mediterranean photoperiod does not affect the main parameters of boar-semen quality analysis

Joan E. Rodríguez-Gil, M. Jesús Palomo, Teresa Rigau, M. Montserrat Rivera, Armando Quintero-Moreno, Xavier Barrera

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31 Citations (Scopus)


Photoperiod is an important factor in the modulation of male reproduction in mammals. In boars, however, it is a controversial factor. The main aim of this work is to determine the precise effect of the natural, Mediterranean photoperiod on boar-semen quality. To do this, boars were housekept in strictly controlled temperature and humidity conditions, whereas light periods were also strictly adjusted to obtain a light-cycle in the farm. The work was performed over a period of one year, thus allowing for the determination of the putative yearly oscillations of boar-semen quality. Variations of the natural Mediterranean photoperiod do not induce substantial changes in overall semen-quality parameters like the percentages of viability, morphological abnormalities and total motility, the response to the osmotic resistance test and sperm motion characteristics. Only the motile-sperm subpopulation structure was significantly (P < 0.05) changed depending on the variations of the natural photoperiod. Furthermore, the boar-semen ability for storage at 15-17°C in a commercial extender was not modified by photoperiod changes. Our results indicate that the natural Mediterranean photoperiod does not induce strong changes in boar-semen characteristics, probably due to boar sperm having a strong capability of adaptation to the light variations of this photoperiod. © 2005 Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)934-946
Publication statusPublished - 1 Sep 2005


  • Boar semen
  • Mediterranean photoperiod


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