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Female rats were fed PBBs in the diet (50 ppm) from day 8 of gestation to day 21 of gestation, from day 1 postpartum to day 14 postpartum or from day 8 of gestation through day 14 postpartum. Levels of PBBs were measured in various tissues. Small concentrations of PBBs (<5 ,g/g) were found in the brain, heart, lung, liver, small intestine, placenta, and gravid uterus. Larger concentrations (<30 ,tg/g) were found in kidneys, the nongravid uterus, skin, mammary tissue, and fat. Lactation did not significantly alter the concentrations of PBBs found in tissues other than mammary tissue.Offspring were subjected to several exposure regimens by cross-fostering. Concentrations of PBBs in the neonatal livers were higher than in the adults nursing them. Transfer of PBBs via the milk appears to be much more important to appearance of PBBs in newborns than does placental transfer.

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