Abstract
The concentration of total iodine in colostrum and normal milk of cows and sows has been determined using a Technicon Autoanalyzer. In cows as well as in sows a lowering of the level of iodine in milk was observed during the first few days after parturition. At the first sampling within 8 hrs. after parturition the concentration of iodine in colostrum of cows from 2 herds was on average 3.4 and 2.4 μg/100 ml, respectively. Corresponding value for colostrum of the sows was 67 μg/100 ml. Based on informations about the composition of the food and daily food consumption it could be estimated that 0.5–1 and 20–45 % of the daily intake of iodine were secreted per 1 milk or colostrum of cows and sows, respectively. It can be concluded that the mammary gland of the sow has a considerably higher ability to concentrate iodine than that of the cow. Furthermore the concentration mechanism is more efficient immediately after parturition than at later stages of lactation.
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