Effect of chelated copper sources on performance of nursery and growing pigs.

摘要: Four experiments were conducted to determine the effect of Cu source and level an antimicrobial agent on performance nursery (6 25 kg) growing (20 65 pigs. Copper was fed either as CuSO4.5H2O (CS), inorganic chelated (ICC) or organic (OCC) provide 31.25 250 ppm supplemental Cu. In Exp. 1, 224 pigs used study added diets. No difference (P less than .05) among treatments observed during period. Treatments continued first 56 d growing-finishing Regardless source, receiving 125 gained faster in other treatments. 2, 216 optimum CS ICC Pigs efficient .01) when at 62.5 (1.69, 1.72 1.59, feed/gain respectively). 3, no differences greater between sources levels found. 4, utilized combined effects performance. OCC (1.99, 1.85 1.90, The compounds these studies not more efficacious for