Previous studies have shown that supplementation of piglet diets with benzoic acid has beneficial effects on post-weaning performance and nitrogen retention (Kluge et al., 2006; Torrallardona et al., 2007). In contrast to other organic acids, benzoicacid is metabolized in the liver to hippuric acid, which is excreted in the urine, reducing urinary pH. This experiment tested the hypothesis that sodium benzoate at 0.4% has the same influence on piglet growth and urinary pH as benzoic acid at 0.35% or0.5%.
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