SUMMARY
The goal of the present study was to investigate the daily amount of motor activity and the daily rhythm
of tryptophan and serotonin in goats housed in individual boxes under a 12/12 light/dark cycle. We equipped
six Girgentana breed goats with Actiwatch-Mini (Cambridge Neurotechnology Ltd, UK), actigraphy-based data
loggers that record a digitally integrated measure of motor activity. Also blood samples were collected
at four-hour intervals over a 48 h period via an intravenous cannula inserted into the jugular vein.
The concentration of tryptophan (TRP) and serotonin (5-HT) were assessed by the high-performance liquid
chromatography (HPLC) method. Our results outline a diurnal pattern of motor activity and levels
of tryptophan in the serum, and a nocturnal pattern of levels of serotonin in the serum, which underline
the impact of endogenous serotoninergic activity on the behavioural aspects of the circadian response to light.
KEY WORDS
motor activity; tryptophan; serotonin; daily rhythm; Capra hircus
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