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Título: | Application of a kinetic model to describe phosphorus metabolism in pigs fed a diet with a microbial phytase |
Autor: | Dias, R. S.; López, Secundino CSIC ORCID ; Moreira, J. A.; Schulin-Zeuthen, M.; Vitti, D. M. S. S.; Kebreab, E.; France, J. | Palabras clave: | Grower-finisher pigs Soybean meal diets Growing pigs Supplemental phytase Efficacy Absorption Bioavailability Calcium Cereals Performance |
Fecha de publicación: | jun-2010 | Editor: | Cambridge University Press | Citación: | Journal of Agricultural Science 148 : 277-286 (2010) | Resumen: | The objective of the current study was to apply the Vitti-Dias model to investigate phosphorus (P) metabolism in growing pigs fed a diet supplemented with microbial phytase. The basal diet contained maize, defatted rice bran, vegetable oil, soybean meal, limestone, salt and a vitamin and mineral mix. There was no inorganic P in the diet and phytase was added at levels of 253, 759, 1265 and 1748 phytase units (PU)/kg of feed. The compartmental model included four pools of P: (I) gut lumen, (2) plasma, (3) bone and (4) soft tissue. A single dose of (32)P was administered, and specific radioactivity was measured in plasma, faeces, bone and soft tissue (muscle, heart, liver and kidney) at different times post-dosing for calculation of P flows between pools. Total P absorbed showed a negative relationship with total P excreted in faeces and Was strongly correlated with bone P retention, suggesting that absorbed P was channelled to bone to address its physiological growth. Average efficiency of metabolic utilization of absorbed P was estimated to be 0.94, with 0.52 g/g of total net P balance being accreted in bone and the rest in soft tissue (including muscle and some vital organs). The Vitti-Dias model provided suitable representation of P interchange between compartments (in particular, flows between gut and plasma and partitioning of available P between bone and soft tissue), resulting in estimates of P flows comparable with values calculated from balance data. | Versión del editor: | http://dx.doi.org/10.1017/S0021859610000195 | URI: | http://hdl.handle.net/10261/43128 | DOI: | 10.1017/S0021859610000195 | ISSN: | 0021-8596 |
Aparece en las colecciones: | (IGM) Artículos |
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Reg. 6 Secundino 2010.pdf | 143,59 kB | Adobe PDF | Visualizar/Abrir |
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