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Effect of feeding rapeseed meals varying in the content of antithyroid compounds on the vitamin a status of growing pigs with respect to iodine supply



Effect of feeding rapeseed meals varying in the content of antithyroid compounds on the vitamin a status of growing pigs with respect to iodine supply



Journal of Animal Physiology & Animal Nutrition 61(2-3): 57-67



In three with a total of 92 growing pigs receiving soy bean meal (SBM) or 8% high glucosinolate (> 1% goitrin) rapeseed meal (RSM) in the feed the vitamin A content of the liver and of the blood serum was investigated. In one trial Cu2+ treated RSM having a goitrin content below the detectable limit was included. In the trials 1,2 or 3 in all diets the vitamin A supplementation of 1500 or 1000 IU/kg was the same, but the iodine supplementation ranged from 0.0625 to 1 mg/kg feed. Feeding the RSM without iodine supplementation of the diet lowered the performance, caused iodine deficiency and significantly enlarged the thyroid gland and the liver. The inactivation of the goitrin and of other anti-nutritive factors of the RSM normalized the performance level, but the iodine supplementation of the RSM diet did not so. At equal vitamin A supplementation level the serum vitamin A level of the pigs received RSM was 39,51 and 87% (trial 1 to 3) higher compared to SBM (P < 0.05). The iodine supplementation had no effect on the serum vitamin A level, but the liver vitamin A depot of the iodine deficient animals was reduced by the half (P < 0.05, trial 2) or by a third (P > 0.05, trial 3). The inactivation of the RSM due to Cu2+ increased the liver vitamin A depot (P < 0.05) and partially compensated the increase of the serum vitamin A content. In addition with > 0.25 mg iodine supplementation/ kg feed a complete compensation was observed. As demonstrated for RSM feeding the redistribution of vitamin A between liver and blood may be typical in other deficiency or exposure situations.

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