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Estimating the success rate of ovulation and early litter loss rate in the Japanese black bear (Ursus thibetanus japonicus) by examining the ovaries and uteri

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/jjvr.59.1.31-39

Title: Estimating the success rate of ovulation and early litter loss rate in the Japanese black bear (Ursus thibetanus japonicus) by examining the ovaries and uteri
Authors: Yamanaka, Atsushi Browse this author
Yamauchi, Kiyoshi Browse this author
Tsujimoto, Tsunenori Browse this author
Mizoguchi, Toshio Browse this author
Oi, Toru Browse this author
Sawada, Seigo Browse this author
Shimozuru, Michito Browse this author
Tsubota, Toshio Browse this author
Keywords: corpus albicans
corpus luteum
Japanese black bear
ovulation
placental scar
Issue Date: Feb-2011
Publisher: The Graduate School of Veterinary Medicine, Hokkaido University
Journal Title: Japanese Journal of Veterinary Research
Volume: 59
Issue: 1
Start Page: 31-39
Abstract: In order to develop a method for estimating the success/failure rates of reproductive processes, especially those of ovulation and neonate nurturing, in the Japanese black bear (Ursus thibetanus japonicus), we examined offspring status, corpora lutea (CLs), placental scars (PSs) and corpora albicantia (CAs) in 159 females (0-23 years old) killed as nuisances on Honshu Island of Japan during 2001-2009. PSs were found to remain in the uterus at least until November of the year of parturition. CA detectability began to decline after September of the year of parturition. Monthly and age-specific proportions of CL-present females revealed that the post-mating season starts in August, and that the age of first ovulation is 4 years. These results indicate that the success rate of ovulation (SRO: the probability that solitary/non-lactating mature females actually succeed in ovulation) can be estimated by calculating the proportion of CL-present females among ≥ 4-year-old females without PSs captured from August to November; the early litter loss rate (ELLR: the probability that parenting females lose all of their cubs [0-year-old offspring] before mating season) can be estimated by calculating the proportion of CL-present females among those with PSs and CAs captured in August or later. The estimated values of SRO and ELLR were 0.93 (62/67) and 0.27 (6/22), respectively.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/44863
Appears in Collections:Japanese Journal of Veterinary Research > Volume 59, Number 1

Submitter: 獣医学部図書室

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