Austin A R, Whitehead D C, Le Du Y L, Brownlie J
Res Vet Sci. 1980 Jan;28(1):128-30.
Concentrations of total iodine (TI) and protein-bound iodine (PBI) in the blood serum of both cows and their neonatal calves were related to the iodine content of the diet fed to the cows. A group of six cows (group 1) fed a diet containing 0.6 ppm iodine had mean concentrations of TI and PBI of 4.1 and 3.4 microgram/100 ml respectively. A second group (group 2), fed a diet containing 4.6 ppm iodine, had concentrations of 33.8 and 7.6 microgram/100 ml of TI and PBI respectively. Calves of groups 1 and 2 had mean concentrations of TI of 21 microgram/100 ml and 96 microgram/100 ml respectively within 24 h of birth, but these concentrations declined markedly over a period of eight days. Evidence was obtained that the high concentrations of TI, and also of PBI, in neonatal calves relative to the concentrations in their dams resulted mainly from placental transfer rather than from the ingestion of colostrum.
母牛及其新生犊牛血清中的总碘（TI）和蛋白结合碘（PBI）浓度与母牛所喂日粮中的碘含量有关。一组六头母牛（第1组）喂食含0.6 ppm碘的日粮，其TI和PBI的平均浓度分别为4.1和3.4微克/100毫升。第二组（第2组）喂食含4.6 ppm碘的日粮，其TI和PBI的浓度分别为33.8和7.6微克/100毫升。第1组和第2组的犊牛在出生后24小时内TI的平均浓度分别为21微克/100毫升和96微克/100毫升，但这些浓度在八天内显著下降。有证据表明，新生犊牛体内TI和PBI的高浓度相对于其母体内的浓度，主要是由于胎盘转运而非初乳摄入所致。
