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Responses of thyroid activity to feed restriction in the goat.


Abdullah, Rasedee and I.R., Falconer (1977) Responses of thyroid activity to feed restriction in the goat. Australian Journal of Biological Sciences, 30 (3). pp. 207-215. ISSN 0004-9417


A study of the effect of restriction of feed intake on the deiodination, faecal excretion, -distribution and secretion of thyroid hormones was carried out in a group of-eight young inale goats. ' In the control goats fed ad libitum no changes in the concentration of circulating thyroxine were observed with increasing age -or body weight during the experimental period; however, an increase in thyroxine secretion rate per animal was apparent with increasing age or body weight of'the goats. In feed-restricted goats, no changes in the peripheral deiodination of [125I]thyroxine were observed, 'though significantly reduced faecal excretion of [125I]thyroxine was seen in goats' restricted to 50 or 20% of their ad libitum feed intake. Both thyroxine turnover rate and thyroxine distribution vollime were reduced by feed restriction. The secretion'rate of thyroxine was reduced to 45 % of the rate in ad libitum fed animals when feed intake was restricted to 20 %. Calculation 'of thyroxine secretion rate per kilogramo.75 body weight showed a highly significant correlation with feed intake. It was concluded that the marked reduction in thyroid activity occurring when feed restriction was imposed would be expected to cause a physiologically significant reduction in metaholic activity.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Veterinary Medicine
Publisher: CSIRO
Keywords: Age factors; Animal; Body weight; Feces; Food deprivation; Goats; Male; Secretory rate; Thyroxine.
Depositing User: Azizan Arshad
Date Deposited: 08 Jan 2014 07:17
Last Modified: 08 Jan 2014 07:17
URI: http://psasir.upm.edu.my/id/eprint/26827
Statistic Details: View Download Statistic

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