Kratko priopćenje

https://doi.org/10.24099/vet.arhiv.0471

Determination of reproductive span through morpho-histological studies on the ovaries of captive brown bears (Ursus arctos) - a short communication

Slaven Reljić orcid.org/0000-0002-8110-384X ; Department of Veterinary Biology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Agnieszka Sergiel ; Department of Wildlife Conservation, Institute of Nature Conservation of Polish Academy of Sciences, Krakow, Poland
Nikica Prvanović Babić ; Clinic for Obstetrics and Reproduction, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Ana Beck ; Department of Veterinary Pathology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Snježana Kužir ; Department of Anatomy, Histology and Embriology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Berislav Radišić ; Clinic for Surgery, Orthopaedics and Ophthalmology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Robert Maślak ; Department of Evolutionary Biology and Conservation of Vertebrates, Institute of Environmental Biology, University of Wroclaw, Wroclaw, Poland
Michał Bednarski ; Department of Epizootiology and Clinic of Birds and Exotic Animals, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland
Tomasz Piasecki ; Department of Epizootiology and Clinic of Birds and Exotic Animals, Faculty of Veterinary Medicine, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland
Doroteja Huber ; Department of Veterinary Pathology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia
Đuro Huber ; Department of Veterinary Biology, Faculty of Veterinary Medicine, University of Zagreb, Zagreb, Croatia

Sažetak

The study aimed to determine reproductive span by investigation of the ovarian structures in young and elderly captive brown bear females (Ursus arctos). The ovaries of two 2-year-old females were obtained by ovariectomy and during the necropsies of 31 and 36 year old individuals. All the obtained ovaries were examined macroscopically and histologically. Histological examination of the ovaries of young animals (2+ years) revealed the presence of primordial, primary, secondary and tertiary follicles within the ovarian cortex. One ovary showed a mature corpus luteum, indicating recent ovulation, what is, to our knowledge, the first histological proof of the earliest age of ovulation recorded for captive brown bears. Ovarian atrophy accompanied by the development of multiple cystic subsurface epithelial structures (SES) in the case of the old bears in this study indicates that the ovaries of brown bears share similar degenerative and proliferative patterns with domestic canids. The oldest female had records of successful births at the ages of 26 and 28 years. Both recorded birth events represent one of the latest confirmed occurrences of ovulation, conception and birth amongst brown bears.

Ključne riječi

reproduction; puberty; ovulation; corpus luteum; post-reproductive phase

Hrčak ID:

220037

URI

https://hrcak.srce.hr/220037

Datum izdavanja:

15.4.2019.

Podaci na drugim jezicima: hrvatski

Posjeta: 1.732 *