[Alhaider A.K., Watson P.F. (1999). The effects of hCG and growth factors on in vitro nuclear maturation of dog oocytes obtained during anoestrus. Reprod. Fertil. Dev., 21: 538–548.10.1071/RD08167]Search in Google Scholar
[Antończyk A., Niżański W., Twardoń J., Kozdrowski R., Ochota M., Błasiak K., Mikołajewska N., Stańczyk E. (2010). Current views on computer assisted sperm analysis. Med. Weter., 66: 663–667.]Search in Google Scholar
[Bailey J.L., Bilodeau J.F., Cormier N. (2000). Semen cryopreservation in domestic animals: a damaging and capacitating phenomenon. J. Androl., 21: 1–7.10.1002/j.1939-4640.2000.tb03268.x]Search in Google Scholar
[Bani-Hani S.A. (2011). Semen quality and chemical oxidative stress; quantification and remediation. ETD Archive, 24, https://engagedscholarship.csuohio.edu/etdarchive/24.]Search in Google Scholar
[Banihani S.A., Abu-Alhayjaa R.F. (2016). The activity of seminal creatine kinase is increased in the presence of pentoxifylline. Andrologia, 48: 603–604.10.1111/and.12486]Search in Google Scholar
[Barakat I.A., Danfour M.A., Galewan F.A., Dkhil M.A. (2015). Effect of various concentrations of caffeine, pentoxifylline, and kallikrein on hyperactivation of frozen bovine semen. Biomed. Res. Int., 2015: 1–7.10.1155/2015/948575]Search in Google Scholar
[Belala R., Fatmi S., Kaidi R., Iguer-Ouada M. (2016). Benefits of cholesterol and α-tocopherol loaded cyclodextrins in dog semen cryopreservation. Revue Méd. Vét., 167: 22–27.]Search in Google Scholar
[Brie D., Sahebkar A., Penson P.E., Dinca M., Ursoniu S., Serban M.C., Zanchetti A., Howard G., Ahmed A., Aronow W.S., Muntner P., Lip G.Y., Wong N.D., Rysz J., Banach M. (2016). Effects of pentoxifylline on inflammatory markers and blood pressure: a systematic review and meta-analysis of randomized controlled trials. J. Hypertens., 34: 2318–2329.10.1097/HJH.0000000000001086]Search in Google Scholar
[Carrel D.T., Aston K.I. (2013). Spermatogenesis: Methods and Protocols. New York, USA, Humana Press.10.1007/978-1-62703-038-0]Search in Google Scholar
[Centola G.M., Cartie R.J., Cox C. (1995). Differential responses of human sperm to varying concentrations of pentoxifylline with demonstration of toxicity. J. Androl., 16: 136–142.]Search in Google Scholar
[Comizzoli P., Crosier A.E., Songsasen N., Gunther M.S., Howard J.G., Wildt D.E. (2009). Advances in reproductive science for wild carnivore conservation. Reprod. Domest. Anim., 44: 47–52.10.1111/j.1439-0531.2009.01373.x]Search in Google Scholar
[Dziekońska A., Fraser L., Strzeżek J. (2009). Effect of different storage temperatures on the metabolic activity of spermatozoa following liquid storage. J. Anim. Feed Sci., 18: 638–649.10.22358/jafs/66438/2009]Search in Google Scholar
[Esteves S.C., Spaine D.M., Cedenho A.P. (2007). Effects of pentoxifylline treatment before freezing on motility, viability and acrosome status of poor quality human spermatozoa cryopreserved by the liquid nitrogen vapor method. Braz. J. Med. Biol. Res., 40: 985–992.10.1590/S0100-879X2006005000118]Search in Google Scholar
[Fraser L., Lecewicz M., Strzeżek J. (2002). Fluorometric assessments of viability and mitochondrial status of boar spermatozoa following liquid storage. Pol. J. Vet. Sci., 5: 85–92.]Search in Google Scholar
[Garner D.L., Johnson L.A. (1995). Viability assessment of mammalian sperm using SYBR-14 and propidium iodide. Biol. Reprod., 553: 276–284.10.1095/biolreprod53.2.276]Search in Google Scholar
[Garner D.L., Thomas C.A. (1999). Organelle-specific probe JC-1 identifies membrane potential differences in the mitochondrial function of bovine sperm. Mol. Reprod. Dev., 53: 222–229.10.1002/(SICI)1098-2795(199906)53:2<222::AID-MRD11>3.0.CO;2-L]Search in Google Scholar
[Gradil C.M., Ball B.A. (2000). The use of pentoxifylline to improve motility of cryopreserved equine spermatozoa. Theriogenology, 54: 1041–1047.10.1016/S0093-691X(00)00412-X]Search in Google Scholar
[Hammitt D.G., Bedia E., Rogers P.R., Syrop C.H., Donovan J.F., Williamson R.A. (1989). Comparison of motility stimulants for cryopreserved human semen. Fertil. Steril., 52: 495–502.10.1016/S0015-0282(16)60925-1]Search in Google Scholar
[Imoedemhe D.A., Sigue A.B., Pacpaco E.A., Olazo A.B. (1992). Successful use of the sperm motility enhancer 2-deoxyadenosine in previously failed human in vitro fertilization. J. Assist. Reprod. Genet., 9: 53–56.10.1007/BF01204115]Search in Google Scholar
[Inanc M.E., Tekin K., Olgac K.T., Yilmaz B., Cil B., Tasdemir U., Tuncer P.B., Buyukleblebici S., Durmaz E., Uysal O. (2018). Effect of cholesterol loaded cyclodextrin on semen cryopreservation of Aksaray Malakli shepherd dogs of different ages. Anim. Reprod. Sci., 193:191–200.10.1016/j.anireprosci.2018.04.068]Search in Google Scholar
[Jewgenow K., Braun B.C., Dehnhard M., Zahmel J., Goeritz F. (2017). Research on reproduction is essential for captive breeding of endangered carnivore species. Reprod. Domest. Anim., 52: 18–23.10.1111/rda.12836]Search in Google Scholar
[Johnson A.E., Freeman E.W., Wildt D.E., Songsasen N. (2014). Spermatozoa from the maned wolf (Chrysocyon brachyurus) display typical canid hyper-sensitivity to osmotic and freezing-induced injury, but respond favorably to dimethyl sulfoxide. Cryobiology, 68: 361–370.10.1016/j.cryobiol.2014.04.004]Search in Google Scholar
[Karger S., Geiser B., Grau M., Heuwieser W., Arlt S.P. (2017). Short communication: Progressive motility of frozen-thawed canine semen is highest five minutes after thawing. Reprod. Domest. Anim., 52: 350–352.10.1111/rda.12905]Search in Google Scholar
[Kay V.J., Coutts J.R.T., Robertson L. (1993). Pentoxifylline stimulates hyperactivation in human spermatozoa. Hum. Reprod., 8: 727–731.10.1093/oxfordjournals.humrep.a138129]Search in Google Scholar
[Kim S.H., Yu D.H., Kim Y.J. (2010). Effects of cryopreservation on phosphatidylserine translocation, intracellular hydrogen peroxide, and DNA integrity in canine sperm. Theriogenology, 73: 282–292.10.1016/j.theriogenology.2009.09.011]Search in Google Scholar
[Kordan W., Lecewicz M., Strzezek R., Dziekońska A., Fraser L. (2010). Effect of platelet activating factor (PAF) supplementation in semen extender on viability and ATP content of cryopreserved canine spermatozoa. Pol. J. Vet. Sci., 13: 571–579.10.2478/v10181-010-0019-y]Search in Google Scholar
[Koutsarova N., Todorov P., Koutsarov G. (1997). Effect of pentoxifylline on motility and longevity of fresh and thawed dog spermatozoa. J. Reprod. Fertil., 51: 117–121.]Search in Google Scholar
[Lanzafame F., Chapman M.G. Guglielmino A., Gearon C.M., Forman R.G. (1994). Pharmacological stimulation of sperm motility Hum. Reprod., 9: 192–199.10.1093/oxfordjournals.humrep.a138481]Search in Google Scholar
[Laokirkkiat P., Kunathikom S., Choavaratana R., Petyim S., Prechapanich J. (2007). Comparison between sperm treated with pentoxifylline and 2-deoxyadenosine using hypoosmotic swelling test. J. Med. Assoc. Thai., 90: 211–215.]Search in Google Scholar
[Lewis S.E., Moohan J.M., Thompson W. (1993). Effects of pentoxifylline on human sperm motility in normozoospermic individuals using computer assisted analysis. Fertil. Steril., 59: 418–423.10.1016/S0015-0282(16)55708-2]Search in Google Scholar
[Linde-Forsberg C. (1991). Achieving canine pregnancy by using frozen or chilled extended semen. Vet. Clin. North Am. Small Anim. Pract., 21: 457–485.10.1016/S0195-5616(91)50054-1]Search in Google Scholar
[López F.J., Alvariño J.M. (2000). Effects of added caffeine on results following artificial insemination with fresh and refrigerated rabbit semen. Anim. Reprod. Sci., 58: 147–154.10.1016/S0378-4320(99)00084-6]Search in Google Scholar
[Lucio C.F., Angrimani D.S.R., Brito M.M., Vannucchi C.I. (2017). Oxidative stress challenges during the sperm cryopreservation in dogs. J. Vet. Androl., 2: 1–7.]Search in Google Scholar
[Mason S.J. (2017). A retrospective clinical study of endoscopic-assisted transcervical insemination in the bitch with frozen-thawed dog semen. Reprod. Domest. Anim., 52: 275–280.10.1111/rda.12864]Search in Google Scholar
[Maxwell W.M., Robinson S.J., Roca J., Molinia F.C., Sanchez-Partida L.G., Evans G. (1995). Motility, acrosome integrity and fertility of frozen ram spermatozoa treated with caffeine, pentoxifylline, cAMP, 2-deoxyadenosine and kallikrein. Reprod. Fertil. Dev., 7: 1081−1087.10.1071/RD9951081]Search in Google Scholar
[Mbizvo M.T., Johnston R.C., Baker G.H.W. (1993). The effect of the motility stimulants, caffeine, pentoxifylline, and 2-deoxyadenosine on hyperactivation of cryopreserved human sperm. Fertil. Steril., 59: 1112–1117.10.1016/S0015-0282(16)55937-8]Search in Google Scholar
[Milani C., Fontbonne A., Sellem E., Stelletta C., Gérard O., Romagnoli S. (2010). Effect of post-thaw dilution with caffeine, pentoxifylline, 2'-deoxyadenosine and prostatic fluid on motility of frozen-thawed dog semen. Theriogenology, 74: 153–164.10.1016/j.theriogenology.2010.01.026]Search in Google Scholar
[Mundle S.D., Reza S., Ali A., Mativi Y., Shetty V., Venugopal P., Gregory S.A., Raza A. (1999). Correlation of tumor necrosis factor alpha (TNF alpha) with high Caspase 3-like activity in myelodysplastic syndromes. Cancer Lett., 140: 201–207.10.1016/S0304-3835(99)00072-5]Search in Google Scholar
[Nabavi N., Todehdehghan F., Shiravi A. (2013). Effect of caffeine on motility and vitality of sperm and in vitro fertilization of outbreed mouse in T6 and M16 media. Iran. J. Reprod. Med., 11: 741–746.]Search in Google Scholar
[Nizanski W., Dubiel A., Bielas W., Dejneka G.J. (2001). Effects of three cryopreservation methods and two semen extenders on the quality of dog semen after thawing. J. Reprod. Fertil., 57: 365–369.]Search in Google Scholar
[Nöthling J.O., Shuttleworth R. (2005). The effect of straw size, freezing rate, and thawing rate upon post-thaw quality of dog semen. Theriogenology, 63: 1469–1480.10.1016/j.theriogenology.2004.07.012]Search in Google Scholar
[Peeker R., Abramsson L., Marklund S.L. (1997). Superoxide dismutase isoenzymes in human seminal plasma and spermatozoa. Mol. Hum. Reprod., 3: 1061–1066.10.1093/molehr/3.12.1061]Search in Google Scholar
[Pena F.J. (2007). Detecting subtle changes in sperm membranes in veterinary andrology. Asian J. Androl., 9: 731–737.10.1111/j.1745-7262.2007.00311.x]Search in Google Scholar
[Ponce A.A., Fiolde Cuneo M., Ruiz R.D., Vincenti L.M., Santillá M.E., Stutz G., Lacuara J.L. (1999). Influence of pentoxifylline on sperm membrane functional integrity. Arch. Androl., 43: 77–84.10.1080/014850199262760]Search in Google Scholar
[Prapaiwan N., Tharasanit T., Punjachaipornpol S., Yamtang D., Roongsitthichai A., Moonarmart W., Kaeoket K., Manee-In S. (2016). Low-density lipoprotein improves motility and plasma membrane integrity of cryopreserved canine epididymal spermatozoa. Asian-Australas. J. Anim. Sci., 29: 646–651.10.5713/ajas.15.0572]Search in Google Scholar
[Rasul Z., Ahmad N., Anzar M. (2001). Changes in motion characteristics, plasma membrane integrity, and acrosome morphology during cryopreservation of buffalo spermatozoa. J. Androl., 22: 278–283.10.1002/j.1939-4640.2001.tb02181.x]Search in Google Scholar
[Rijsselaere T., Van Soom A., Maes D., Niżanski W. (2012). Computer-assisted sperm analysis in dogs and cats: an update after 20 years. Reprod. Domest. Anim., 47: 204–207.10.1111/rda.12057]Search in Google Scholar
[Rodenas C., Parrilla I., Roca J., Martinez E.A., Lucas X. (2014). Effects of rapid cooling prior to freezing on the quality of canine cryopreserved spermatozoa. J. Reprod. Dev., 60: 355–361.10.1262/jrd.2014-024]Search in Google Scholar
[Rota A., Ström B., Linde-Forsberg C. (1995). Effects of seminal plasma and three extenders on canine semen stored at 4 degrees C. Theriogenology, 44: 885–900.10.1016/0093-691X(95)00278-G]Search in Google Scholar
[Setyawan E.M., Kim M.J., Oh H.J., Kim G.A., Jo Y.K., Lee S.H., Choi Y.B., Lee B.C. (2015). Maintaining canine sperm function and osmolyte content with multistep freezing protocol and different cryoprotective agents. Cryobiology, 71: 344–349.10.1016/j.cryobiol.2015.08.010]Search in Google Scholar
[Sharma R.K., Tolentino M.V. Jr, Thomas A.J. Jr, Agarwal A. (1996). Optimal dose and duration of exposure to artificial stimulants in cryopreserved human spermatozoa. J. Urol., 155: 568–573.10.1016/S0022-5347(01)66451-6]Search in Google Scholar
[Silva A.R., Cardoso R.C., Silva L.D. (2006). Influence of temperature during glycerol addition and post-thaw dilution on the quality of canine frozen semen. Reprod. Domest. Anim., 41: 74–78.10.1111/j.1439-0531.2006.00630.x]Search in Google Scholar
[Slanina T., Miškeje M., Tirpák F., Błaszczyk M., Formicki G., Massányi P. (2018). Caffeine strongly improves motility parameters of turkey spermatozoa with no effect on cell viability. Acta Vet. Hung., 66: 137–150.10.1556/004.2018.013]Search in Google Scholar
[Stachecki J.J., Dresser B.L., Pope C.E., Armant D.R. (1995). Stimulation of ejaculated domestic cat spermatozoa motility with caffeine, pentoxifylline, and 2’-deoxyadenosine. Arch. Androl., 34: 63–68.10.3109/01485019508987832]Search in Google Scholar
[Stănescu (Pascal) M., Bîrţoiu A.I. (2012). Freezing of dog’s sperm: a review. Rom. Biotechnol. Lett., 17: 7709–7716.]Search in Google Scholar
[Stephens T.D., Brooks R.M., Carrington J.L., Cheng L., Carrington A.C., Porr C.A., Splan R.K. (2013). Effects of pentoxifylline, caffeine, and taurine on post-thaw motility and longevity of equine frozen semen. J. Equine Vet. Sci., 33: 615–621.10.1016/j.jevs.2012.10.004]Search in Google Scholar
[Strzeżek R., Polakiewicz W., Kordan W. (2015). The effect of two packaging systems on the post-thaw characteristics of canine sperm. Pol. J. Vet. Sci., 18: 249–253.10.1515/pjvs-2015-0032]Search in Google Scholar
[Tesarik J., Thèbault A., Testart J. (1992). Effect of pentoxifylline on sperm movement characteristics in normozoospermic and asthenozoospermic specimens. Hum. Reprod., 7: 1257–1263.10.1093/oxfordjournals.humrep.a137837]Search in Google Scholar
[Uchoa D.C., Silva T.F., Mota Filho A.C., Silva L.D. (2012). Intravaginal artificial insemination in bitches using frozen/thawed semen after dilution in powdered coconut water (ACP-106c). Reprod. Domest. Anim., 47: 289–292.10.1111/rda.12077]Search in Google Scholar
[Van den Berghe F., Paris M.C.J., Briggs M.B., Farstad W.K., Paris D.B.B.P. (2018). A two-step dilution tris-egg yolk extender containing Equex STM significantly improves sperm cryopreservation in the African wild dog (Lycaon pictus). Cryobiology, 80: 18–25.10.1016/j.cryobiol.2017.12.095]Search in Google Scholar
[Yamaguchi S., Suzuki C., Noguchi M., Kasa S., Mori M., Isozaki Y., Ueda S., Funahashi H., Kikuchi K., Nagai T., Yoshioka K. (2013). Effects of caffeine on sperm characteristics after thawing and inflammatory response in the uterus after artificial insemination with frozen-thawed boar semen. Theriogenology, 79: 87–93.10.1016/j.theriogenology.2012.09.012]Search in Google Scholar
[Yovich J.M., Edirisinghe W.R., Cummins J.M., Yovich J.L. (1990). Influence of pentoxifylline in severe male factor infertility. Fertil. Steril., 53: 715–722.10.1016/S0015-0282(16)53470-0]Search in Google Scholar
[Yu I., Songsasen N., Godke R.A., Leibo S.P. (2002). Differences among dogs in response of their spermatozoa to cryopreservation using various cooling and warming rates. Cryobiology, 44: 62–78.10.1016/S0011-2240(02)00005-6]Search in Google Scholar
[Yunes R., Fernández P., Doncel G.F., Acosta A.A. (2005). Cyclic nucleotide phosphodiesterase inhibition increases tyrosine phosphorylation and hyper motility in normal and pathological human spermatozoa. Biocell., 29: 287–293.10.32604/biocell.2005.29.287]Search in Google Scholar
[Zhang J., Guo H., Su J., Zhao L., Li Y., Sun W., Han H., Hu S., Zhao G., Li Y., Dai Y., Li X. (2014). A comparison of the effects of pentoxifylline on quality of fresh and frozen-thawed bull spermatozoa. Agriculture Biotechnology, 3: 20–29.]Search in Google Scholar
[Zhang X., Sharma R.K., Agarwal A., Falcone T. (2005). Effect of pentoxifylline in reducing oxidative stress-induced embryotoxicity. J. Assist. Reprod. Genet., 22: 415–417.10.1007/s10815-005-7202-6]Search in Google Scholar