Chandola, Asha ; Thapliyal, J.P. ; Pavnaskar, J. (1974) The effects of thyroidal hormones on the ovarian response to photoperiod in a tropical finch (Ploceus philippinus) General and Comparative Endocrinology, 24 (4). pp. 437-441. ISSN 00166480
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Official URL: http://doi.org/10.1016/0016-6480(74)90157-9
Related URL: http://dx.doi.org/10.1016/0016-6480(74)90157-9
Abstract
A constant 15-hr daily photoperiod led to a prolonged reproductive phase in the female tropical weaver finch Ploceus philippinus. Thyroxine treatment (1.4 and 2.8 μg on alternative days for 5 mo) completely suppressed follicular development, and ovarian and oviducal weight, but had no effect on the liver and body weight in birds maintained on 15-hr daily photoperiods. A “thyroid-sensitive” hypothalamo/hypophyseal/gonadal axis, as exhibited by this bird and many other birds of mid and low latitudes where the degree of insolation is large, may serve as a safety mechanism against unseasonal gonadal growth and hence might be of adaptive significance in tropical photoperiodic finches.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Inc |
| ID Code: | 130836 |
| Deposited On: | 30 Nov 2022 10:47 |
| Last Modified: | 30 Nov 2022 10:47 |
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