Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens)
“Veterinary Integrative Sciences” is the official peer-reviewed journal of the Faculty of Veterinary Medicine, Chiang Mai University, Thailand. The primary aim of the journal is to facilitate and oversee the publication of a wide-range of high quality academic articles with an overall integration of...
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Faculty of Veterinary Medicine,ChiangMai Universitity
2020
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| Online Access: | https://he02.tci-thaijo.org/index.php/vis/article/view/240059/164206 http://cmuir.cmu.ac.th/jspui/handle/6653943832/68624 |
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th-cmuir.6653943832-686242020-05-20T04:41:49Z Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) Etsuko Katsumata Hiroshi Katsumata Kazutoshi Arai Yoshiaki Nakano Kazuyoshi Taya Birth interval Pregnancy Reproductive behavior Urinary sex steroid hormones Walrus “Veterinary Integrative Sciences” is the official peer-reviewed journal of the Faculty of Veterinary Medicine, Chiang Mai University, Thailand. The primary aim of the journal is to facilitate and oversee the publication of a wide-range of high quality academic articles with an overall integration of the various areas of animal and veterinary sciences A pair of pacific walruses were subjected for a long term study for 20 years on their growth and reproduction since 6 months of age, and succeed breeding four times. The body lengths both male and female walruses continued to grow after they have reach the sexual maturity, until the age of 14 years, then growth have reached their plateau. The ages of the male and the female at sexual maturation were 10 and 9 year-old. The body weight markedly increased in the breeding season in the sexually matured male, showing the “fatted male phenomenon”. The copulatory behavior showed a clear seasonal pattern, which was observed for one or two days, during February 26 through March 22. Parturition occurred during May 3 through June 6, and the mean gestation period was 441 ± 2.3 days (n = 4). The urinary estrone conjugate (EC) and pregnanediol-3-glucuronide (PDG) in the pregnant female showed sharp increase in the late September, an approximately 200-day after copulation, as the body weight of pregnant female started to increase. These results may be suggesting that delayed implantation had been completed and fetal development had started. The calf started to wean at approximately 6 months, although the nursing continued throughout the following 3 years until the next parturition. The birth interval was three years. 2020-05-20T04:41:49Z 2020-05-20T04:41:49Z 2020 Veterinary Integrative Sciences (Vet Integr Sci) 18, 2 (May-Aug 2019), p.1-18 2629-9968 https://he02.tci-thaijo.org/index.php/vis/article/view/240059/164206 http://cmuir.cmu.ac.th/jspui/handle/6653943832/68624 Eng Faculty of Veterinary Medicine,ChiangMai Universitity |
| institution |
Chiang Mai University |
| building |
Chiang Mai University Library |
| continent |
Asia |
| country |
Thailand Thailand |
| content_provider |
Chiang Mai University Library |
| collection |
CMU Intellectual Repository |
| language |
English |
| topic |
Birth interval Pregnancy Reproductive behavior Urinary sex steroid hormones Walrus |
| spellingShingle |
Birth interval Pregnancy Reproductive behavior Urinary sex steroid hormones Walrus Etsuko Katsumata Hiroshi Katsumata Kazutoshi Arai Yoshiaki Nakano Kazuyoshi Taya Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| description |
“Veterinary Integrative Sciences” is the official peer-reviewed journal of the Faculty of Veterinary Medicine, Chiang Mai University, Thailand. The primary aim of the journal is to facilitate and oversee the publication of a wide-range of high quality academic articles with an overall integration of the various areas of animal and veterinary sciences |
| author |
Etsuko Katsumata Hiroshi Katsumata Kazutoshi Arai Yoshiaki Nakano Kazuyoshi Taya |
| author_facet |
Etsuko Katsumata Hiroshi Katsumata Kazutoshi Arai Yoshiaki Nakano Kazuyoshi Taya |
| author_sort |
Etsuko Katsumata |
| title |
Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| title_short |
Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| title_full |
Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| title_fullStr |
Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| title_full_unstemmed |
Growth and reproduction of captive Pacific Walrus (Odobenus rosmarus divergens) |
| title_sort |
growth and reproduction of captive pacific walrus (odobenus rosmarus divergens) |
| publisher |
Faculty of Veterinary Medicine,ChiangMai Universitity |
| publishDate |
2020 |
| url |
https://he02.tci-thaijo.org/index.php/vis/article/view/240059/164206 http://cmuir.cmu.ac.th/jspui/handle/6653943832/68624 |
| _version_ |
1681752659084705792 |