Effect of food intake on diel variation in plasma thyroid hormone levels in rainbow trout, Salmo gairdneri

Trout fed once each day (0930 hr) and held on a 12L:12D light cycle (0800–2000 hr light) show a diel change in plasma T 4 and T 3, the highest levels occuring at 0900 to 1300 hr and the lowest levels at 0500 to 0900 hr. In agreement with a previous study, 3 days of starvation eliminated the diel var...

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Bibliographic Details
Published inGeneral and comparative endocrinology Vol. 45; no. 2; pp. 167 - 174
Main Authors Eales, J.G., Hughes, M., Uin, L.
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.01.1981
Subjects
Animals
Body Weight
Circadian Rhythm
Food
Freshwater
Hematocrit
Salmonidae - blood
Starvation - blood
Thyroxine - blood
Time Factors
Triiodothyronine - blood
Trout - blood
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Summary:Trout fed once each day (0930 hr) and held on a 12L:12D light cycle (0800–2000 hr light) show a diel change in plasma T 4 and T 3, the highest levels occuring at 0900 to 1300 hr and the lowest levels at 0500 to 0900 hr. In agreement with a previous study, 3 days of starvation eliminated the diel variation. Alteration in feeding time to 1630 hr did not shift the peak in plasma T 4 or T 3, indicating that the elevation in plasma T 4 and T 3 at 0900 to 1300 hr is not a direct response to food intake.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0016-6480
1095-6840
DOI:10.1016/0016-6480(81)90101-5