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Influence of diet on plasma thyroxine response to thyroid stimulating hormone in growing lambs

Published online by Cambridge University Press:  27 March 2009

Patricia M. M. Godden  and
T. E. C. Weekes
Patricia M. M. Godden
Affiliation:
Department of Agricultural Biochemistry and Nutrition, University of Newcastle upon Tyne, Newcastle upon Tyne NJE1 7RU
T. E. C. Weekes
Affiliation:
Department of Agricultural Biochemistry and Nutrition, University of Newcastle upon Tyne, Newcastle upon Tyne NJE1 7RU
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Summary

In an initial experiment four mature sheep were injected with saline or 25, 75 or 150 m units bovine thyroid stimulating hormone (TSH)/kg live weight. All doses of TSH stimulated a similar release of thyroxine.

In a second experiment ten lambs were fed chopped dried grass from weaning until 108 days old (period 1). Five of the lambs (group 1) were then fed 30% barley: 70% grass until 178 days of age; the remaining lambs (group 2) continued to receive grass (period 2). After 178 days group 1 was fed 70% barley: 30% grass and group 2 30% barley: 70% grass (period 3). All lambs were injected with 25 m units TSH/kg live weight at 105–108 days of age, 174–178 days and 220–227 days. The thyroxine response to TSH was greatest in lambs fed 30% barley: 70% grass in periods 2 and 3. Plasma insulin and glucose concentrations tended to decrease after TSH.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 3 , June 1981 , pp. 599 - 602
Copyright
Copyright © Cambridge University Press 1981

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References

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