An experiment was designed to evaluate the effect of the glucosinolate content of rapeseed meal on the transfer of dietary iodine to eggs. 2. The experimental diets, containing two concentration (50 or 100 g/kg) of high-or low-glucosinolate rapeseed meal and a diet, devoid of rapeseed meal, all supplemented with 0-3 mg I/kg were given to laying hens for 6 weeks before oral administration of 125I daily for 11 d. 3. The percentage of 125I transferred to egg yolk was significantly reduced by the inclusion of high-glucosinolate rapeseed meal but not by low-glucosinolate meal. 4. Determination of the total iodine content of egg yolk indicated that there was some reduction in the transfer of dietary iodine to eggs even with the low glucosinolate rapeseed meal.
