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Copper and iodine in pig diets with high glucosinolate rapeseed meal i. performance and thyroid hormone status of growing pigs fed on a diet with rapeseed meal treated with copper sulfate solution or untreated and supplements of iodine copper or a quinoxaline derivative



Copper and iodine in pig diets with high glucosinolate rapeseed meal i. performance and thyroid hormone status of growing pigs fed on a diet with rapeseed meal treated with copper sulfate solution or untreated and supplements of iodine copper or a quinoxaline derivative



Animal Feed Science and Technology 22(1-2): 33-44



In 2 feeding experiments with a total of 80 fattening pigs, supplements of 250 mg Cu, 0.5 or 1 mg I and 50 mg of a quinoxaline derivative (Bisergon) kg-1 to a diet with 8% rapeseed meal (RSM) were tested. On average, RSM contained 0.3% iothiocyanate (ITC) and 1.3% oxazolidinethione (OT) in the dry matter. Neither ITC nor OT could be detected after the RSM treatment with copper sulphate solution (Cu2+) followed by drying, therefore, in the second animal experiment we included groups fed on a diet with RSM which was treated with Cu2+ or H2O and then dried. The RSM rations without I supplementation caused hypothyroidism characterized by a thyroid hormone deficit, decreased feed intake and growth, myxoedema and cretinism. Thyroid weight was increased 13-fold. Iodine supplementation increased the thyroid hormone level in blood compared to that of the control group and prevented signs of deficiency. Thyroid weight was still three times as great as that of a control group and performance was reduced by 10%. Combined with I, copper supplementation tended to improve performance and thyroid hormone state. If Cu2+ took effect on RSM (1 kg RSM with 12.5 g CuSO4 .cntdot. 5H2 O dissolved in 0.5 1 water, dried after 24 h at 60.degree. c over a period of 48 h) the performance was increased significantly (P < 0.05) and nearly reached that of the soya-bean meal (SBM) control. The treatment of RSM with Cu2+ normalized the weight of thyroid and liver, and increased the serum thyroid hormone concentration.

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Related references

Copper and iodine in pig diets with high glucosinolate rapeseed meal. I. Performance and thyroid hormone status of growing pigs fed on a diet with rapeseed meal treated with copper sulphate solution or untreated and supplements of iodine, copper or a quinoxaline derivative. Animal Feed Science and Technology 22(1): 33-43, 1988

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