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Author (up) Riveros, J.L.; Correa, L.M.; Schuler, G. url  doi
  Title Daylight effect on melatonin secretion in adult female guanacos (Lama guanicoe) Type Journal Article
  Year 2017 Publication Reproduction in Domestic Animals = Zuchthygiene Abbreviated Journal Reprod Domest Anim  
  Volume 52 Issue 6 Pages 1129-1132  
  Keywords Animals  
  Abstract The wild South American camelids developed a strategy of seasonal reproduction during spring and summer with singleton birth. The photoperiod is one of the factors that may modulate this seasonality where light would be translated into a hormonal signal. This study evaluated the influence of changes in daily light intensity on melatonin concentration in captive guanacos under a long-day photoperiod (16 hr light/8 hr dark; 33 '28'S). Mean melatonin concentration was 28.3 +/- 20.3 pg/ml, with a maximum of 52.14 +/- 17.19 pg/ml at 23:30 and minimum of 14.29 +/- 6.64 pg/ml at 08:30 (p < .001). There was a negative association between light intensity and melatonin concentration (r = -0.57; p < .001). The results indicate that guanacos respond to variation in daily environmental light with a hormonal response and point to a circannual rhythm as a function of the photoperiod.  
  Address Departamento de Ciencias Animales, Facultad de Agronomia e Ingenieria Forestal, Pontificia Universidad Catolica de Chile, Santiago, Chile  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0936-6768 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:28731219 Approved no  
  Call Number LoNNe @ kyba @ Serial 1688  
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