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    Effects of chronic exposure to 2G/3G cell phone radiation on in vitro maturation of bovine oocytes
    (Agricultural Research Communication Centre, 2018) Guzey, Yusuf Ziya; Onal, Ali Galip
    Mobile phone use has arisen and rapidly been increased during last decades and therefore electromagnetic radiation or heat sourcing from mobile phones and its possible damages has become focus of interest. The aim of the present study was to investigate the effects of mobile phone signals on in vitro maturation of bovine oocytes. A total of 224 bovine cumulus oocyte complexes were matured in vitro and separated into two groups, and only treatment group received mobile phone signals for 100 min by calling 5 min/h. Following maturation period, oocytes were stained by fluorescent stain to assess maturation rates. The results showed that oocytes reaching Metaphase I and Metaphase II stage were 35.2 +/- 2.24 % and 48.2 +/- 2.21 % for treatment group whereas 11.9 +/- 1.45 % and 73.8 +/- 4.60 % for controls, respectively (P<0.01). In conclusion, bovine oocyte maturation has been significantly reduced by mobile phone signals.
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    Effects of Thymus vulgaris L. essential oil and compounds on development and quality of bovine preimplantation embryos in vitro
    (Sivar-Soc Italiana Veterinari Animali Reddito, 2021) Guzey, Yusuf Ziya
    Thyme oil is already being used in humans and animals for its various activities; however, little is known about its influence on preimplantation embryos. We aimed to investigate the effects of thyme oil on the growth, development and quality of embryos produced in vitro. A total of 266 blastocysts were harvested from 936 oocytes in 11 replicates. The addition of thyme oil significantly increased cleavage rate (P<0.05) morulae (P<0.01) and blastocyst (P<0.001) yield. Embryo quality parameters were found to be enhanced by antioxidant supplementation at atmospheric oxygen level (P<0.001). High oxygen tension during in vitro culture of bovine embryos is detrimental probably due to the accumulation of reactive oxygen species. Reduction of oxidative stress during in vitro production of bovine embryos may support subsequent development and improve the quality of blastocysts (P<0.001). Thyme oil can safely be used to decrease these adverse effects of oxidative stress in this regard. Moreover, in vitro culture of bovine embryos can be performed using carbon dioxide incubators instead of expensive ones.