Plasma separated from jugular blood samples from six weaned ram lambs was examined for zeranol after the lambs had been implanted, behind the left ear, with a 12 mg pellet. The results showed that the ipsilateral vein contained significantly more zeranol for up to 100 days after implantation; by 145 to 175 days the difference between the ipsi- and contralateral veins was no longer significant. Massage of the implant site did not increase the rate of release of zeranol from the residual mass.
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