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The influence of iodine copper and zinc supplements to rations with a high quota of rape seed meal on growth and the function of the thyroid gland of fattening pigs 2. the influence of iodine supplement on the digestibility of nutrients as well as on protein and energy retention



The influence of iodine copper and zinc supplements to rations with a high quota of rape seed meal on growth and the function of the thyroid gland of fattening pigs 2. the influence of iodine supplement on the digestibility of nutrients as well as on protein and energy retention



Archiv fuer Tierernaehrung 36(4-5): 361-369



Three groups of six pigs each (live weight at the beginning of the experiment 20 kg) were given a cereal ration with 8% rape seed meal. Group I did not receive a J supplement and was fed ad libitum. The rations of groups II and III were supplemented with 1 mg J/kg feed. The feed intake of group II was limited to the amount consumed by group I (pair fed); group III received the feed ad libitum. The daily weight gains of the 3 groups were 327, 377 and 613 g, feed expenditure 3.79, 3.68 and 3.47 kg/kg gain. In an N balance experiment carried out with 3 animals each from groups I and II, 41.4% of the N taken in group I and 43.8% in group II were retained (p > 0.05). Liver, intestinal fat and leaf were heavier in group I (p < 0.01), the protein content of the empty body, the bones and bristles significantly lower than in group II. Protein retention in group II was 14% higher than in group I. In case of iodine deficiency protein retention is lower, energy retention, however, is largely unchanged.

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