Effects of high and low glucose DMEM extenders on sperm cryopreservation in honey bees


Published: Apr 19, 2025
Keywords:
Cryoprotectant DMEM honey bee semen extender
AO Özkök
B Esin
A Eser
Abstract

Honey bee sperm can be stored and used at room temperature for up to a week. However, freezing storage methods used for long-term storage negatively affect the sensitive honey bee semen. In order to reduce this negative effect, the effects of many different diluents and various freezing protocols are being investigated. This study aims to evaluate the effect of DMEM (Dulbeco's Modified Eagle Medium) diluents with different glucose ratios on the spermatological parameters of frozen honeybee semen. The study used two different DMEM diluents containing high and low glucose. Honey bee sperm samples, diluted 13 -fold with high glucose DMEM (4.5 g/L glucose, L glutamine and pyruvate) and low glucose DMEM (1 g/L glucose, L-glutamine and sodium bicarbonate) at a ratio of 1:12, were frozen in liquid nitrogen. It was kept for three months. At the end of the period, the thawed samples were evaluated in terms of spermatological parameters (motility, viability, plasma membrane integrity, and spermatozoa morphology). Motility, viability, and plasma membrane integrity parameters were high in honeybee semen frozen with DMEM diluent with high glucose content (P<0.001). As a result, we think that DMEM diluent with high glucose content can be used effectively in the cryopreservation of honey bee semen.

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