R. Hermes

Publications90
h-index26
Citations1,824
Highly Influential Citations116
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Reproductive problems directly attributable to long-term captivity--asymmetric reproductive aging.
Problems attributable to long-term captivity have been identified and are responsible for the difficulties in establishing successful reproduction in captive populations of wildlife, specifically,… Expand
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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…
White rhinoceroses suffer from a low rate of reproduction in captivity. This study examines the role of male reproductive function as a contributing factor. We used ultrasonography to image accessory… Expand
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Ultrasonography of the Urogenital Tract in Elephants (Loxodonta africana and Elephas maximus): An Important Tool for Assessing Male Reproductive Function
The success rate of captive elephant breeding programs worldwide is poor. Along with undiagnosed reproductive disorders in females and fatal diseases such as the newly discovered herpesvirus… Expand
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The effect of long non-reproductive periods on the genital health in captive female white rhinoceroses (Ceratotherium simum simum, C.s. cottoni).
White rhinoceroses suffer from a low reproductive rate in captivity. Intensive efforts to propagate specifically the northern white rhinoceros have been very limited. The dismal outlook for this… Expand
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Successful cryopreservation of Asian elephant (Elephas maximus) spermatozoa.
Reproduction in captive elephants is low and infant mortality is high, collectively leading to possible population extinction. Artificial insemination was developed a decade ago; however, it relies… Expand
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Assisted reproduction in female rhinoceros and elephants--current status and future perspective.
Over the last few decades, rhinoceroses and elephants became important icons in the saga of wildlife conservation. Recent surveys estimate the wild Asian (Elephas maximus) and African (Loxodonta… Expand
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Artificial insemination in the anoestrous and the postpartum white rhinoceros using GnRH analogue to induce ovulation.
The objective of this study was to develop AI and to achieve first time pregnancy in a nulliparous rhinoceros. For this, one 24-year-old irregular cycling female white rhinoceros was selected, which… Expand
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Aspects of the reproductive biology and breeding management of Asian and African elephants Elephas maximus and Loxodonta africana
Elephants possess many unique qualities, including some that relate directly to their reproductive biology. Thus, comparative studies on elephants provide valuable information to the growing… Expand
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Obstetrics in elephants.
Obstetrics, one of the oldest fields in veterinary medicine, is well described and practiced in domestic and exotic animals. However, when providing care during elephant birth or dystocia, veterinary… Expand
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The successful double cryopreservation of rabbit (Oryctolagus cuniculus) semen in large volume using the directional freezing technique with reduced concentration of cryoprotectant.
Using directional freezing, our objective was to cryopreserve rabbit semen and achieve fertility that was equal or higher than that achieved with conventional freezing. The working hypothesis was… Expand
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