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In a 1-month feeding trial, pure and commercial tri-n-butyltin oxide (TBTO) and tri-n-butyltin chloride (TBTC) were fed to rats at concentrations of 5 ppm and 25 ppm. At all times, the mean body weight gain and the food consumption was significantly less in rats treated with 25 ppm pure TBTO or pure TBTC as compared to control rats or rats receiving commercial TBTO. Histological examination of the thymus of rats treated for 7 days with TBTO showed atrophy with severe lymphocytic depletion in the cortex. After 28 days of exposure, most of the lesions reversed and the thymus became markedly smaller than in control rats, both in absolute terms and in relation to body weight. Seven days of exposure to TBTO increased liver weight but this change was reversed during a further 3-week exposure. Tin concentrations were the highest in livers and kidneys. Concentrations in the thymus were less than one-fifth of hepatic values. Changes in the rats treated with the commercial TBTO were very similar. Rats treated with TBTC showed lower tin levels and less immunotoxicity as compared to those treated with TBTO.
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