Summary
The circadian rhythm of the blood corticosterone level disappeared in rats that had been given a liquid diet i.v. during a resticted time of day for 10 days, suggesting an important role of the oro-gastrointestinal tract in formation of the rhythm.
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Saito, M., Kato, H., Suda, M. et al. Parenteral feeding abolishes the circadian adrenocortical rhythm in rats. Experientia 37, 754–755 (1981). https://doi.org/10.1007/BF01967962
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DOI: https://doi.org/10.1007/BF01967962