RT Journal Article T1 Cryopreservation of captive roe deer (Capreolus capreolus) semen A1 Prieto-Pablos, Maria Teresa A1 Sánchez Calabuig, María Jesús A1 Hildebrandt, Thomas B A1 Göritz, Fran A1 Ortmann, Silvie A1 Eder, S A1 Santiago Moreno, Julian A1 Hermes, Robert A1 Saragusty, Joseph AB To address the need to preserve current genetic diversity before it is lost forever; further studies to adapt assisted reproductive technologies to various endangered species are needed, among other things. Roe deer (Capreolus capreolus), an over abundant wild deer, can serve as model species to develop or improve sperm cryopreservation of threatened or endangered deer species. The aim of this study was to compare the ability of three diluents (Berliner Cryomedium [BC]; Tris, citric acid, glucose [TCG]; TES, Tris, glucose) to support chilling, cryopreservation (with 5% glycerol; G) and postthaw incubation (at 22 °C and 37 °C) of roe deer spermatozoa collected by electroejaculation. Berliner Cryomedium was the diluent that better preserved roe deer spermatozoa during refrigeration, able to maintain motility for at least 14 days, longer than the other extenders. BC + G was the extender of choice for cryopreservation, showing higher viability compared with TCG + G (66.7 ± 3.4 vs. 54.5 ± 6.5; P < 0.05) and higher level of acrosome integrity compared with TES, Tris, glucose + G (79.4 ± 3.4 vs. 67.9 ± 5.0; P < 0.05). Maintaining the samples at 22 °C after thawing presented higher values in various parameters compared with 37 °C. The knowledge gained through this study can potentially act as a preliminary step toward development of new protocols to help increase the reproductive success of biologically similar, yet endangered, wild species. PB Elsevier SN 0093-691X YR 2016 FD 2016 LK https://hdl.handle.net/20.500.14352/117859 UL https://hdl.handle.net/20.500.14352/117859 LA eng NO Prieto-Pablos, Sánchez-Calabuig, Hildebrandt, Göritz, Ortmann, Eder, Santiago-Moreno, Hermes, & Saragusty. (2016). Cryopreservation of captive roe deer (Capreolus capreolus) semen. Theriogenology, 86(3), 695-703. https://doi.org/10.1016/J.THERIOGENOLOGY.2016.02.023 NO Ministerio de Educación y Formación Profesional (España) DS Docta Complutense RD 6 abr 2025