Four lactating cows were confined in metabolism stalls and each given a single oral dose ~f~~~~T e .For the next 5 days, all milk, urine and feces from the cows were collected and the 129mTe content measured. The highest concentration of lmrnTe in the milk was 0.0035%/1.18 hr following administration of the nuclide. The activity decreasedwith a biological half-time in the milk of 38 hr. The total activity transferred to milk was limited with 0.254% of the administered nuclide secreted in approximately 13 days. Thirty hours after dosing 49% of the administered activity had been excreted by all routes. After 5 days 80% of the activity had been recovered with 95% of this activity recovered in the feces. In a companion study three calves were administered radiotellurium orally and sacrificed after varying time periods to determine tissue distribution. The radiotellurium was found to be distributed throughout the body of calves with the main concentration occurring in the kidney and liver.
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