Japanese Journal of Zoo and Wildlife Medicine
Online ISSN : 2185-744X
Print ISSN : 1342-6133
ISSN-L : 1342-6133
Volume 13, Issue 2
Displaying 1-5 of 5 articles from this issue
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  • Satoshi KUSUDA, Kaoko ISHIHARA, Masakazu IKOMA, Osamu DOI, Katsuji UET ...
    2008Volume 13Issue 2 Pages 45-50
    Published: 2008
    Released on J-STAGE: May 04, 2018
    JOURNAL FREE ACCESS
    The aims of the present study were to characterize differences in behavior between copulatory and non-copulatory periods in male and female Malayan tapirs (Tapirus indicus) and to illustrate the characteristics of estrus-related behaviors in female tapirs. Megascopic observations were performed using two procedures for two pairs of male and female Malayan tapirs in captivity. In observation I, five behavioral categories, Attract (♀→♂), Chasing (♂→♀), Mounting (♂→♀), Copulation (♂) and Vocalization (♀), were recorded as present or absent within a day for over 1 year. In observation II, eighteen behavioral categories of maintenance and reproductive behaviors were recorded by the methods of one-zero sampling with 1-min intervals and/or continuous sampling for 4 months. The estrous cycle of a female, from which it was possible to collect blood, was determined by assaying serum progesterone concentrations. Copulation periods in pairs I and II lasted for 1.7±0.4 days at 46.7±3.9 day- intervals and 2.1±0.3 days at 34.4±1.2 day- intervals, respectively. In the males of both pairs, Chasing (♂→♀), Mounting (♂→♀), Sexual investigation (♂→♀), Vocalization and Biting (♂→♀) significantly increased in the copulatory period. In females, Vocalization significantly increased and Spray urination had a tendency to increase in the copulatory period than non-copulatory period. In contrast, Resting significantly increased in the non-copulatory period. The estrous cycle based on the serum progesterone profiles of a female was 46.3±4.9 days and thus well corresponded to the copulatory cycle length; therefore, it seems that increased vocalization and possibly spray urination are estrous signs in female Malayan tapirs.
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