Citation
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
Abstract
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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