A Case Report Concerning Male Gametes Rescued from a Siamese Eld's Deer (Rucervus eldii siamensis) : Post-Thawed Testicular and Epididymal Sperm Quality and Heterologous Zona Pellucida Binding Ability

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  • THUWANUT Paweena
    Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
  • THONGPHAKDEE Ampika
    Zoological Park Organization under the Royal Patronage of H. M. the King, Bangkok 10300, Thailand
  • SOMMANUSTWEECHAI Angkana
    Zoological Park Organization under the Royal Patronage of H. M. the King, Bangkok 10300, Thailand
  • SIRIAROONRAT Boripat
    Zoological Park Organization under the Royal Patronage of H. M. the King, Bangkok 10300, Thailand
  • CHATDARONG Kaywalee
    Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand

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  • A Case Report Concerning Male Gametes Rescued from a Siamese Eld’s Deer (<i>Rucervus eldii siamensis</i>): Post-Thawed Testicular and Epididymal Sperm Quality and Heterologous Zona Pellucida Binding Ability

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In the present study, the quality of frozen-thawed epididymal and testicular sperm recovered from a Siamese Eld’s deer was examined. The epididymal sperm quality was assessed in fresh, cold-stored at 4°C and frozen-thawed samples. Zona binding ability of the frozen-thawed epididymal samples with Burmese Eld’s deer oocytes was also evaluated. Testicular sperm extracted from tissues frozen at -80 or -196°C for one month were examined for membrane and DNA integrity. Epididymal sperm retained their quality for up to 24 hr of cold storage at 4°C. The percentages of sperm motility, intact membrane, intact acrosome and intact DNA were 30, 46.5, 27 and 89.5% in the frozen and thawed epididymal sperm, and the average ability to bind with oocytes was 92.5 ± 64 sperm/oocytes. Around 70% of the sperm extracted from testicular tissues cryopreserved at -196 and -80°C for one month showed an intact membrane. In conclusion, epididymal and testicular sperm survived for more than 13 hr post-mortem. Furthermore, cold storage at 4°C and cryopreservation at -196 and -80°C maintain the quality of epididymal and testicular sperm. This study represents a model for male gamete rescue in endangered Eld’s deer.

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