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Effect of Nonstarch Polysaccharide-Rich By-Product Diets on Nitrogen Excretion and Nitrogen Losses from Slurry of Growing-Finishing Pigs |
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T. T. Canh, M. W. A. Verstegen, N. B. Mui, A. J. A. Aarnink, J. W. Schrama, C. E. Van't Klooster, N. K. Duong |
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| Abstract |
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An experiment was conducted to investigate the effect of diet for growing-finishing pigs with high level of non-starch polysaccharides (NSP) from by-products on nitrogen excretion and nitrogen losses from slurry during storage. Sixteen commercial crossbred barrows of about 68 kg BW were randomly allotted to one of four diets. The control diet was formulated using tapioca and rice as basal energy sources. In the other diets, tapioca was replaced by either coconut expeller, rice bran or beer by-product. The diets differed mainly in the amount and composition of NSP. After a 12-day adaptation period, urine and faces were collected separately in metabolism cages for 9 days. Urine and faces from the first four days were used to analyse the nitrogen partitioning. Urine and faces from the last 5 days were mixed as slurry. The slurry was sampled at the end of the collection period and again after 30 days storage, to analyse for nitrogen to calculate the losses. Increasing dietary NSP reduced most nitrogen and nitrogen losses from the slurry during storage. The pigs fed the diet based on beer by-product excreted the most nitrogen via faces and the least nitrogen via urine. Nitrogen losses from slurry of pigs fed the beer by-product were from 34 to 65% lower than from the other three diets. It is concluded that including NSP-rich by-products in the diet of growing-finishing pigs reduces urinary nitrogen excretion and nitrogen losses from slurry during storage. |
| Keywords:
Pig; By-product; Polysaccharides; Nitrogen; Slurry; pH |
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