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Primates

, Volume 55, Issue 3, pp 393–401 | Cite as

Effect of photoperiod on characteristics of semen obtained by electroejaculation in stump-tailed macaques (Macaca arctoides)

  • Mónica Dafne García Granados
  • Leonor Estela Hernández LópezEmail author
  • Alejandro Córdoba Aguilar
  • Ana Lilia Cerda Molina
  • Olivia Pérez-Ramírez
  • Ricardo Mondragón-Ceballos
Original Article

Abstract

Some environmental variables determining seasonal reproduction in mammals are temperature, humidity, food availability, and photoperiod. Among these, photoperiod is considered the main regulator of primates’ seasonal reproduction, thus the latitudinal distribution of primate populations is a key factor determining the appearance of seasonal reproduction. The present work presents supporting discrete seasonality in male stump-tailed macaques (Macaca arctoides). We investigated whether semen quality and testosterone covaried with Mexico City’s photoperiod and relative humidity by analyzing variations in the portions that form the ejaculate: the seminal liquid, the seminal coagulum, and the copulatory plug. Five male adult stump-tailed macaques were electroejaculated once a month, obtaining three semen samples per male, from August 2011 to July 2012 (except for December 2011) (n = 165). Our results showed that stump-tailed macaque sperm counts were significantly different between the portions of the ejaculate. The seminal coagulum contained the significantly largest number of spermatozoids, followed by the copulatory plug and the seminal fluid. Photoperiod and relative humidity had major influence on the sperm count in the seminal coagulum and the testosterone concentrations. Testosterone reached its highest values around the time when days and nights lasted the same hours, decreasing when days either grew longer or became shorter. Concerning relative humidity, sperm counts in the seminal coagulum were highly variable on dry days, but decreased as the relative humidity increased. We conclude that stump-tailed macaques have a discrete seasonality, occurring in spring and fall when macaques’ reproductive condition and readiness for postcopulatory intrasexual competition increase.

Keywords

Macaca arctoides Photoperiod Relative humidity Seasonal reproduction 

Notes

Acknowledgments

This research project was supported by the Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz. We thank Javier Borráz León and Gema Estudillo for their valuable help with laboratory work. We thank Mrs. Sally Packard for correcting the English version of the manuscript. Concerning experimentation ethics, the Bioethics Committee of the Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz approved the experimental protocol and animal handling. We also followed the Mexican Official Norm of Technique Specifications for the Production, Care, and Use of Laboratory Animals (NOM-062-ZOO 1999), and the Policy Statement on Use of Primates for Biomedical Purposes, as adopted by the World Health Organization (WHO) and the Ecosystem Conservation Group (ECG).

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Copyright information

© Japan Monkey Centre and Springer Japan 2014

Authors and Affiliations

  • Mónica Dafne García Granados
    • 1
  • Leonor Estela Hernández López
    • 1
    Email author
  • Alejandro Córdoba Aguilar
    • 2
  • Ana Lilia Cerda Molina
    • 1
  • Olivia Pérez-Ramírez
    • 1
  • Ricardo Mondragón-Ceballos
    • 1
  1. 1.Departamento de EtologíaInstituto Nacional de Psiquiatría, “Ramón de la Fuente Muñiz”Mexico, D.F.Mexico
  2. 2.Departamento de Ecología Evolutiva, Instituto de EcologíaUniversidad Nacional Autónoma de MéxicoMexico, D.F.Mexico

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