Determination of reproductive span through morpho-histological studies on the ovaries of captive brown bears (Ursus arctos) - a short communication
PBN-AR
Instytucja
Instytut Ochrony Przyrody Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
VETERINARSKI ARHIV
ISSN
0372-5480
EISSN
1331-8055
Wydawca
UNIV ZAGREB VET FACULTY
DOI
URL
Rok publikacji
2019
Numer zeszytu
2
Strony od-do
233-246
Numer tomu
89
Identyfikator DOI
Liczba arkuszy
0,98
Słowa kluczowe
angielski
reproduction
puberty
ovulation
orpus luteum
post-reproductive phase
Streszczenia
Język
angielski
Treść
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.
Inne
System-identifier
EX-5d47d799d5de1cd9ef6061fd
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