Effects of melatonin treatment on follicular development and oocyte quality in Chios ewes - Short communication

Theodora Tsiligianni, Irene Valasi, Sándor Cseh, Emmanuel Vainas, Vera Faigl, Fotini Samartzi, Thomas Papanikolaou, Eleni Dovolou, Georgios Amiridis

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Follicular development and oocyte quality were assessed by laparoscopic observation and in vitro fertilisation, respectively, in melatonin-treated (Group M) and control (Group C) anoestrous Chios ewes (n = 10 in each group). Fourteen days after melatonin insertion, all ewes had laparoscopic evaluation of the follicular population followed by oocyte pick-up (OPU); on day 22 intravaginal progestagen sponges were inserted for 14 days. Two days after sponge removal the follicular population was re-evaluated and a second follicular aspiration was performed. Collected oocytes from the second OPU underwent in vitro maturation, fertilisation and culture. The number of large follicles was higher in Group M than in the control ewes during the first OPU and tended to be so (P = 0.06) at the second. Morphologically, oocytes collected from controls were of better quality than those from Group M; however, more oocytes collected from melatonintreated animals fertilised and developed in vitro . These results indicate that melatonin is a potent regulator of follicular development and oocyte competence during the anoestrous period of the ewe.

Original languageEnglish
Pages (from-to)331-335
Number of pages5
JournalActa veterinaria Hungarica
Issue number2
Publication statusPublished - Jun 1 2009



  • Embryo
  • Melatonin
  • OPU
  • Oocyte
  • Sheep

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Tsiligianni, T., Valasi, I., Cseh, S., Vainas, E., Faigl, V., Samartzi, F., Papanikolaou, T., Dovolou, E., & Amiridis, G. (2009). Effects of melatonin treatment on follicular development and oocyte quality in Chios ewes - Short communication. Acta veterinaria Hungarica, 57(2), 331-335. https://doi.org/10.1556/AVet.57.2009.2.13