Thyroid hormone periodicity in healthy adult geldings
Description
Citation
| Title | Thyroid hormone periodicity in healthy adult geldings |
| Author(s) | W. Duckett, J. Manning, P. Weston |
| Journal | Equine veterinary journal |
| Date | 1989 |
| Volume | 21 |
| Issue | 2 |
| Start page | 123 |
| End page | 125 |
| Abstract | Serum samples were collected from 10 healthy geldings every 4 h for three consecutive days and the triiodothyronine (T3) and thyroxine (T4) concentrations determined by radioimmunoassay. There were significant differences in the hormone concentrations related to time. The mean (+/- sd) T3 concentration peaked around 08.00 h at a level (54.06 +/- 14.02 ng/dl) significantly (P less than .001) higher than the lowest concentration (38.71 +/- 10.81 ng/dl) around midnight. Although the highest mean T3 level was 08.00 h, this value was not significantly different from the noon and 16.00 h levels. Likewise, the mean T3 level at midnight was not significantly different from the 20.00 h and 04.00 h levels, resulting in a plateau from 08.00 h to 16.00 h and a trough from 20.00 h to 04.00 h. The mean (+/- sd) T4 concentration peaked around 16.00 h at a level (2.43 +/- .81 micrograms/dl) significantly (P less than .01) higher than the lowest concentration (1.79 +/- .63 micrograms/dl) around 04.00 h. |
| ISSN | 0425-1644 |
Using APA 6th Edition citation style.
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