475.

Owen AA, Peo Jr. ER, Cunningham PJ, Moser BD. Chelated trace minerals for G-F swine. J of Animal Sci. 1973; 37(1):95-103. (NA44) [Ninety-six crossbred castrated male pigs in 6 groups were given a diet of maize and soya bean meal, calculated to contain 14% crude protein and 20 mg Zn/kg, without added trace elements, with reagent grade trace elements or with EDTA salts of the trace elements providing 100, 75, 50 and 25% of the amount provided by the reagent grade supplements. This was Fe 55, Zn 50, Mn 25, Cu 5, I 1.5 and Co 0.5 mg/kg added to the diet. By analysis, Zn contents of the diets were 31.6, 57.2, 78.6, 65.7, 57.5 and 37.8 mg/kg and Cu contents were 5.8, 9.5, 11.2, 10.1, 9.3 and 6.1 mg/kg. Supplements had no effect on growth, feed intake or feed conversion. Blood samples were taken from all pigs on the 1st, 62nd and 92nd days of the trial. Final minus initial Zn in serum was -0.06, -0.08, +0.12, -0.08, -0.34 and -0.36 mg/ml on the 6 diet treatments, respectively. Zn in serum declined linearly with decreasing intake of chelating Zn. Corresponding changes in serum Cu were -0.04, +1.19, +0.76, -0.04, +0.38 and -0.15 mg/ml. At the start and the finish of the experiment samples of hair was ashed and analysed. Zn in hair did not differ significantly among groups. Final minus initial Cu in hair was -12.2, -22.2, -17.0, -39.0, -28.4 and -30.8 mg/g, respectively. AT the end of the experiment length and diameter of the right hind metatarsals were not affected by treatments but breaking strength declined linearly with decreasing chelated minerals, being 286.2, 249.2, 303.1, 239.1, 254.9 and 244.0 kg on the 6 treatments. Mean Zn in the bones was 159.8, 189.4, 179.8, 152.5, 142.2 and 164.8 mg/kg and mean Cu was 6.3, 6.0, 7.1, 6.1, 5.7 and 5.9 mg/kg. It was concluded that supplementary chelated minerals were as useful to the pig as free ones when given in the amounts required, but were less good than none on small intakes.]

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