Abstract
The aim of this investigation was to study the effects of clenbuterol treatment (1 mug/kg b.w. i.m. for 10 consecutive days) on haemocoagulation process in seven calves. From each animal, blood samples were taken before (basal sample) and 24, 72, 144, 216, 264, 336 and 360 h after the end of treatment and some parameters were evaluated: coagulation process [prothrombin (PTT) and thrombin times (PT)], a complete blood count and plasmatic levels of 3'5'-monophosphatocyclic-adenosine (c-AMP) . A comparison of the values in each time group during the whole course of the experiments shows a significant increase (P < 0.03, P < 0.01) in PT and PTT at 72, 144, 216 and 264 h. Significant increase (P < 0.01) in c-AMP plasma levels were observed at 144, 216 and 264 h. All these values returned to normal levels after 360 h.
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