Daily Changes of Arterial and Venous Plasma Catecholamine Concentrations and the Responses of Those to Immobilization in Laying Hens

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Consecutive two experiments were conducted to investigate the daily changes of arterial and venous catecholamine concentrations and the response of those to immobilization (IM) in laying hens. In experiment 1, blood samples were collected from right femoral artery and left wing vein at 0800, 1400, 2000 and 0200h. Both of arterial and venous plasma norepinephrine (NE) concentrations tended to be high in the light and low in the dark period, but were not so in epinephrine (E). In experiment 2, blood samples were collected from right femoral artery and left wing vein at 6h (1400) and 24h (0800) after the start of IM. Both of arterial and venous plasma NE concentrations increased significantly (P<0.01 and P<0.01, respectively) at 6h after the start of IM, being continued till 24h of IM. Venous plasma E concentration increased significantly at 6 and 24h (P<0.05 and P<0.05, respectively) of IM. No differences of plasma NE and/or E concentrations were observed between the artery and the vein after the start of IM. These results suggest that there would be no difference in the daily changes of plasma CA concentration and the response of plasma CA concentration to immobilization between the venous plasma and the arterial plasma.

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