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Taurine levels in various tissues and fluids of female rats were measured throughout pregnancy and lactation. The taurine concentration of liver markedly increased at days 19 and 21 of pregnancy to 188% of levels for nonpregnant, nonlactating control rats and then fell rapidly after delivery to reach only 30% of the control level by 3 days post-partum. Muscle and heart taurine concentrations were significantly negatively correlated with liver taurine levels. Brain taurine levels were low at days 14, 19 and 21 of pregnancy and day 14 of lactation. Urinary excretion of taurine decreased to 32% of control levels at day 21 of pregnancy and was negatively correlated with the hepatic taurine concentration over the course of pregnancy and lactation. The ratio of glycine- to taurine-conjugated bile acids was strongly negatively correlated with the hepatic taurine concentration. The milk taurine level was positively correlated with …