S
Steffen Blottner
Researcher at Leibniz Association
Publications - 54
Citations - 1628
Steffen Blottner is an academic researcher from Leibniz Association. The author has contributed to research in topics: Spermatogenesis & Roe deer. The author has an hindex of 23, co-authored 54 publications receiving 1520 citations.
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Journal ArticleDOI
Seasonal timing of sperm production in roe deer: interrelationship among changes in ejaculate parameters, morphology and function of testis and accessory glands.
Frank Goeritz,M Quest,A Wagener,M Fassbender,Alexandra Broich,Thomas B. Hildebrandt,R.R Hofmann,Steffen Blottner +7 more
TL;DR: The results suggest the importance of combined actions of the testes and accessory sex glands and the crucial role of testosterone in facilitating the optimal timing of intensified semen production to ensure sufficient numbers of normal spermatozoa in seasonal breeders.
Journal ArticleDOI
Seasonal spermatogenesis and testosterone production in roe deer (Capreolus capreolus)
TL;DR: The production of spermatozoa in roe deer is intensified by enlargement of gonads as well as enhanced efficiency of spermatogenesis during the rut, and testosterone seems to play a role in the regulation of both processes.
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Effect of sperm cryopreservation and treatment with calcium ionophore or heparin on in vitro fertilization of horse oocytes.
TL;DR: The results in the this retrospective study show that capacitating fresh spermatozoa with calcium ionophore, or using heparin in cryopreserved spermatozosa, results in higher penetration and fertilization rates of in vitro matured horse oocytes.
Journal ArticleDOI
Morphological and functional changes of stallion spermatozoa after cryopreservation during breeding and non-breeding season.
TL;DR: The cryopreservation of sperm during December results in survival rates similar to those measured during the breeding season, even more important for successful preservation is the selection of suitable semen donors.
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Reproductive soundness of captive southern and northern white rhinoceroses (Ceratotherium simum simum, C.s. cottoni): evaluation of male genital tract morphology and semen quality before and after cryopreservation.
Robert Hermes,Thomas B. Hildebrandt,Steffen Blottner,Christian Walzer,Sandra Silinski,Marilyn L. Patton,Gudrun Wibbelt,Franz Schwarzenberger,Frank Göritz +8 more
TL;DR: The results indicate that low rate of reproduction in captivity can be attributed to reduced male reproductive fitness and changes in management of white rhinoceroses may positively affect male reproductive function.