Browsing by Author "S.K. Pandha"

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Effect of thyroidectomy upon the testes of Indian spotted munia;Uroloncha punctulata
(Springer-Verlag, 1964) S.K. Pandha; J.P. Thapliyal
[No abstract available]
Effect of thyroxin on the gonad and body weight of Spotted Munia, Uroloncha punctulata
(1968) J.P. Thapliyal; R.K. Garg; S.K. Pandha
Low doses of l‐thyroxin promote feather regeneration and lead to significant reduction in the mean weight of the gonad of adult normal and thyroidectomized Spotted Munia, Uroloncha punctulata, in the breeding phase. At moderately high doses of thyroxin complete molting occurs, and the mean weight of the gonoduct is also significantly reduced. The effect of l‐thyroxin increases as the duration of administration is increased. There is practically no difference between the response of normal and thyroidless birds. It is suggested that whereas the effects of l‐thyroxin on the plumage are by way of body metabolism, those on the gonad, gonoduct and body weight are due to a direct influence on the output of the gonad‐stimulating and growth‐promoting hormones from the adenohypophysis. Copyright © 1968 Wiley‐Liss, Inc., A Wiley Company
Hypophysectomy in Indian garden lizard, Calotes versicolor
(Springer-Verlag, 1964) S.K. Pandha; J.P. Thapliyal
[No abstract available]
Light and the Gonadal Cycle of the Black-Headed Munia, Munia malacca malacca
(1969) S.K. Pandha; J.P. Thapliyal
When black-headed Munia, Munia malacca malacca, were subjected to different photoperiods, testes started developing practically immediately under constant short (8 or 9 hrs.) days, but after a delay of three months under long (15-hr.) photoperiod. Under both the photoperiods, gonads were maintained permanently in a full breeding condition. Under natural photoperiod, tests began to grow six months later than those of short-day brids and attained their maximal size four months after their recrudescence. However, thereafter they showed a rapid regression in size. It is suggested that while day-length may induce gonadal development, in nature, some other environmental factor(s) is responsible for bringing about annual gonadal regression. © 1969, The Japan Endocrine Society. All rights reserved.
The thyroid and the hypophysial gonadal axis in the female Spotted Munia, Uroloncha punctulata
(1967) J.P. Thapliyal; S.K. Pandha
When adult female Spotted Munia (Uroloncha punctulata) are surgically thyroidectomized the diameter of the ovarian follicles and the weight of the body start incrasing, reach a maximum, and then hold a plateau. In the juveniles, while there is an early, though partial, but significant increase in the weight of the body and of the ovary, maximal development occurs only at the approach of the breeding season. Further, although the dark pigment and its deposition pattern on the feathers remain unaffected, in the absence of the thyroids feather growth is retarded and the development of the barbules is inhibited. It is suggested that the effects on the plumage are probably due to an indirect action of the thyroids by way of the body metabolism, but that those on the body weight and ovary are due to the direct influence on the hypothalamo/hypophysial/gonadal axis. © 1967.
Thyroid‐gonad relationship in spotted munia, Uroloncha punctulata
(1965) J.P. Thapliyal; S.K. Pandha
Thyroidectomy of adult Spotted munia (Uroloncha punctulata) leads to the gonads remaining permanently in full breeding condition and is responsible for an early increase in testis size and activity in juvenile birds. These effects may be due to (i) general disturbances in metabolism or (ii) continuous secretion of gonadotropic hormones from the hypopyhsis or (iii) to both of these processes. Copyright © 1965 Wiley‐Liss, Inc., A Wiley Company