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Locomotor activity and serum tryptophan and serotonin in goats: daily rhythm

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Author(s): Giuseppe Piccione | Claudia Giannetto | Anna Assenza | Francesco Fazio | Giovanni Caola

Journal: Journal of Applied Biomedicine
ISSN 1214-021X

Volume: 6;
Issue: 2;
Start page: 73;
Date: 2008;
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Keywords: Motor activity | tryptophan | serotonin | daily rhythm | Capra hircus

ABSTRACT
The goal of the present study was to investigate the daily amount of motor activity and the daily rhythm oftryptophan and serotonin in goats housed in individual boxes under a 12/12 light/dark cycle. We equippedsix Girgentana breed goats with Actiwatch-MiniĀ® (Cambridge Neurotechnology Ltd., UK), actigraphy-baseddata loggers that record a digitally integrated measure of motor activity. Also blood samples were collectedat four-hour intervals over a 48 h period via an intravenous cannula inserted into the jugular vein. Theconcentration of tryptophan (TRP) and serotonin (5-HT) were assessed by the high-performance liquidchromatography (HPLC) method. Our results outline a diurnal pattern of motor activity and levels oftryptophan in the serum, and a nocturnal pattern of levels of serotonin in the serum, which underline theimpact of endogenous serotoninergic activity on the behavioural aspects of the circadian response to light.
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