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      Testicular thermoregulation, scrotal surface temperature patterns and semen quality of water buffalo bulls reared in a tropical climate.

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          Abstract

          This study evaluated the capacity of thermoregulation and its consequences on the scrotal surface temperature patterns and semen quality of buffalo bulls raised in a wet tropical climate. Eleven water buffaloes were evaluated in the rainiest, in the transitional and in the less rainy season. Air temperature and humidity were consistently high, but the animals did not show thermal stress in any season. The scrotal temperature gradient of buffalo bulls using infrared thermography was described, and three parallel and decreasing thermal bands were characterised. Sperm quality (n = 176 ejaculates) was maintained in normal parameters over the periods. Pearson's coefficients showed that sperm volume and progressive motility were negatively correlated with ocular globe, epididymal tail and minimum scrotal temperatures (p < .01). Sperm membrane integrity was negatively influenced by increases in epididymal tail and minimum scrotal temperatures (p < .01). Ocular globe temperature also showed positive correlation with rectal, spermatic cord, and epididymal tail temperatures (p < .01). Therefore, even under high temperature and humidity, the thermoregulatory system was effective in preventing heat stress and the normality of scrotal surface temperatures, spermatogenesis and sperm maturation were maintained.

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          Author and article information

          Journal
          Andrologia
          Andrologia
          Wiley-Blackwell
          1439-0272
          0303-4569
          May 18 2017
          Affiliations
          [1 ] Center of Biotechnology of Animal Reproduction, Federal University of Pará, Castanhal, Brazil.
          [2 ] Institute of Health and Animal Production, Federal Rural University of Amazonia, Belém, Brazil.
          [3 ] Embrapa Eastern Amazon, Brazilian Agricultural Research Corporation, Belém, Brazil.
          [4 ] Faculty of Architecture and Urbanism, Federal University of Pará, Belém, Brazil.
          [5 ] Embrapa Southeast Livestock, Brazilian Agricultural Research Corporation, São Carlos, Brazil.
          Article
          10.1111/and.12836
          28517368
          113feaab-a422-4cd1-afd1-c8ad7f421678
          History

          Bubalus bubalis,infrared thermography,scrotal temperatures,scrotum,semen

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