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Influence of diets with rapeseed meal containing varying amounts of goitrogenic compounds or iodine on performance immune response and some blood serum parameters in growing pigs



Influence of diets with rapeseed meal containing varying amounts of goitrogenic compounds or iodine on performance immune response and some blood serum parameters in growing pigs



Acta Veterinaria Brno 56(3): 281-296



In two feeding trials with 74 growing pigs from 20 to 100 kg live body mass, diets containing 8% untreated rapeseed meal-solvent extracted-(RSM) were compared with RSM whose content of goitrogenic compounds was reduced by the treatment with copper ions (Cu2+). The RSM diets were given without iodine supplementation or supplemented with 0.0625 to 1 mg J/kg. The control animals received a soybean meal (SBM) diet with 0.125 mg J/kg feed. The application of the RSM diet without iodine supplementation lowered the serum T4 level, feed intake and growth. The thyroid hormone deficit also occurred when Cu2+-treated RSM was fed, but without the performance depression. In both diets, a lack of iodine decreased the serum antibody titers to two of three antigens administered. Hypothyroidism did not affect the serum protein, albumin and globulin level, but the serum urea level was increased (P < 0.05), the content of inorganic P decreased (P < 0.05). The depression of immune response and growth in hypothyroid animals resulted from an impaired protein synthesis or an unfavourable relation synthesis-catabolism. There was no effect of the reduced feed intake of the pair fed animals (littermates that received the same feed quantity as the iodine deficiency animals but with iodine supplementation) on the immune response and some clinical-chemical parameters. Therefore the pathophysiology of hypothyroidism cannot be simply explained by the food consumption impairment.

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