Effects Of Α-Adrenoreceptor Antagonists On Adrenaline- Induced Rumination In The Goat (Capra jorcis)

(Taj Alosfia Ahmed Osman and Kha)

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Abstract

Rumination activity, induced by the intravenous (i.v.) injection of adrenaline, was investigated in conscious goats. Rapid i.v. injection of adrenaline evoked rumination, and the duration of rumination activity ranged between 13.4 and 20.9 minutes. When the goats were pretreated with the α1-antagonist prazosin, adrenaline failed to induce rumination. Pretreatment of goats with the α2-antagonist yohimbine had no effect on the adrenaline-induced rumination activity. It is concluded that adrenaline-induced rumination in goats is mediated by α1-adrenoreceptors.
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