Journal
ATMOSPHERE
Volume 14, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/atmos14050776
Keywords
fattening pig; nitrogen excretion; TAN excretion; LP diets; sugar beet pulp; benzoic acid; ammonia emission
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This trial evaluated the effects of different nutritional treatments on the N balance parameters of fattening pigs. The results showed that feeding low-protein diets reduced N excretion and urinary pH significantly compared to the control diet. Sugar beet pulp increased the fecal N excretion and urinary pH, while reducing N digestibility and the TAN ratio. Benzoic acid did not reduce urinary pH. The measured N excretion, retention, and TAN excretion values were more favorable than those in the guidelines or emission inventory.
In this trial, the effects of different nutritional treatments on the N balance parameters of fattening pigs in the 55-65 kg live weight category were evaluated. The following diets were used: control diet (C) and low-protein (LP) diet with 2% crude protein reduction, with and without 10% sugar beet pulp (S) or 0.5% benzoic acid supplementation. Six pigs per treatment with similar live weight were used, and in the context of the balance trial, the daily N intake, fecal and urinary N excretion and the pH of urine were measured. From the data N digestibility, the TAN % and N retention were calculated. Feeding LP diets reduced the fecal, urinary and total N excretion and also the pH of urine significantly compared with the control diet. Sugar beet pulp significantly increased the fecal N excretion and urinary pH, and it also reduced significantly N digestibility and the TAN ratio. Benzoic acid failed to reduce urinary pH. The measured N excretion, retention and TAN excretion values were more favorable than those that can be found in the different guidelines or those used in the Hungarian ammonia emission inventory.
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