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Angrimani, D.S.R.; Barros, P.M.H.; Losano, J.D.A.; Cortada, C.N.M.; Bertolla, R.P.; Guimaraes, M.A.B.V.; Correa, S.H.R.; Barnabe, V.H.; Nichi, M.
Effect of different semen extenders for the storage of chilled sperm in Tigrina (_Leopardus tigrinus_)
2017  Theriogenology (89): 146-154

To enhance the conservation of endangered populations, the present study aimed to evaluate whether Tigrinas (_Leopardus tigrinus_) sperm could be conserved under refrigeration for short periods while maintaining sufficient quality for use in assisted-reproductive techniques (i.e., cryopreservation,_invitro_fertilization). For this purpose, semen samples from 15 Tigrinas individuals were submitted to conventional and functional tests after different cooling periods (4øC; 0, 12, and 24hours postcooling), using TCM 199 (TCM), Ham's F10 (HAM), Ham's F10 with bovine serum albumin (HBSA), and Tris-citrate egg yolk (TEYC) extenders. In a second step, semen cooled using TEYC was supplemented with reduced glutathione (GSH) at different concentrations (0, 0.5, 1.0, and 1.5mM). TEYC yielded superior results compared with TCM, HAM, and HBSA even after 24hours of cooling in regard to the sperm motility index (SMI-TEYC: 50.2ñ1.7%), high mitochondrial activity (TEYC: 51.4ñ1.9%), plasma membrane integrity (TEYC: 53ñ2.1%), and DNA integrity (TEYC: 56.3ñ2.9%). In regard to the concentration of thiobarbituric-acid-reactive substances (TBARS), TEYC (1900.1ñ341.4ng/106 spermatozoa) showed higher levels compared with the other extenders (HAM: 638.7ñ121.6ng/106 spermatozoa; HBSA: 468.7ñ95.6ng/106 spermatozoa; TCM: 169.6ñ31.6ng/106 spermatozoa). However, GSH therapy had no effect. In conclusion, the TEYC extender may be useful in maintaining sperm parameters of Tigrinas for up to 24hours at 4øC. Furthermore, these results allow the transport of this material at a minimum quality to be further used for artificial insemination,invitrofertilization, and the development of semen cryopreservation protocols. 

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