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Illinois Agricultural Experiment Station, Urbana 61801
Abstract
Four trials involving 560 pigs were conducted to evaluate oxidation ditch mixed liquor (ODML) as a source of supplemental protein, B-vitamins (riboflavin, niacin, pantothenic acid, choline and B12) and calcium and phosphorus (Ca-P). The source of drinking water was either ODML or tap water. In trial I, pigs fed the diet supplemented with B-vitamins and Ca-P and given tap water gained faster (P<.05) and consumed more (P<.05) fed than pigs fed the unsupplemented diets and receiving ODML. Pigs fed the 1614% dietary protein sequence gained faster (P<.05) than the pigs fed the 1412% sequence. Gain to feed ratio, however, was not affected by treatment. In trial II, a 2 x 2 x 2 factorial, gain and gain to feed ratio of finishing pigs were affected (P<.05) by dietary protein level (14 vs 12%) but not by supplemental B-vitamins or source of drinking water. In trials III and IV, neither level of B-vitamins nor level of Ca-P affected performance of finishing pigs. "However, humerus mass per unit of live body weight was reduced (P<.10, trial III; P<.005, trial IV) when the diet contained no supplemental Ca-P. In trial IV, rate of gain (P<.01), feed intake (P<.01) and gain to feed ratio were lower when ODML was the source of water. This finding appeared to reflect the higher ODML nitrate levels that persisted during the trial.
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