Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21895
Title: Sonographic evaluation of thyroid morphology during different reproductive events in female Indo-Pacific bottlenose dolphins, Tursiops aduncus
Authors: Kot, BCW
Ying, MTC 
Brook, FM
Kinoshita, RE
Kane, D
Chan, WK
Keywords: Anestrus
Estrus
Indo-Pacific bottlenose dolphin
Lactation
Pregnancy
Thyroid gland
Tursiops aduncus
Issue Date: 2012
Publisher: Wiley-Blackwell
Source: Marine mammal science, 2012, v. 28, no. 4, p. 733-750 How to cite?
Journal: Marine mammal science 
Abstract: Thyroid morphology and function are likely affected by the cyclic hormonal environment during different reproductive events in females. The present study was undertaken to evaluate the variation of thyroid morphology at different reproductive events (anestrus, estrus, lactation, and pregnancy) in a captive group of Indo-Pacific bottlenose dolphins (Tursiops aduncus) measured using sonography. Sonographic examinations of the thyroid gland and ovaries in nine sexually mature female subjects were performed weekly for 2.5 yr. A generalized linear mixed model was used to estimate the effects of the reproductive events for thyroid volume. Reproductive event was found to be a significant predictor for thyroid volume measurement and significant variation in thyroid volume was found between different reproductive events. A significantly larger thyroid volume in lactating females was observed when compared with estrous and anestrous females, possibly due to the high energy requirements and milk production during lactation. Taken together, thyroid volume variation during different reproductive events in female dolphins should be considered so as to obtain a diagnostically meaningful assessment when conducting routine examinations.
URI: http://hdl.handle.net/10397/21895
ISSN: 0824-0469
EISSN: 1748-7692
DOI: 10.1111/j.1748-7692.2011.00530.x
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