Nanotechnology-assisted cryopreservation of ovine semen: evaluation of Thymus vulgaris essential oil as a natural antioxidant

The objective of the present study was to evaluate the protective effects of nanoemulsion of thyme ( Thymus vulgaris ) essential oil (EO) during the liquid state preservation of ram semen. Storage media were prepared: one containing Thymus vulgaris essential oil (Th), another with its nanoemulsion form (NTh), and a control sample without essential oil (Dovx). The quality of the semen diluted in the prepared media after preservation at 4°C and 15°C was examined by measuring the two parameters indicative of semen quality: semen motility and progressivity refer to the ability of ram sperm cells to move actively and efficiently, which is crucial for successful fertilization. The results showed a decrease in the mobility and progressivity of the sperm in all the mediums, but the thyme EO and its nanoemulsion showed slight decreases compared to the control medium (p