Modelling phosphorus intake, digestion, retention and excretion in growing and finishing pig: model evaluation

• Published in: Animal (Cambridge, England) England), 2014-10, Vol.8 (10), p.1622-1631
• Main Authors: Symeou, V., Leinonen, I., Kyriazakis, I.
• Format: Article
• Language: English
• Subjects: 6-Phytase - metabolism; Animal Feed - analysis; Animals; blood flow; Body Weight; calcium; Calcium, Dietary - metabolism; canola meal; Computer Simulation; data collection; diet; Diet - veterinary; Dietary Supplements; digestion; Digestion - physiology; distillers grains; dynamic models; Escherichia coli Proteins - metabolism; excretion; Female; finishing; Food, Formulated; Gastrointestinal Tract - physiology; Genotype; industry; ingredients; Male; mathematical model; model validation; Models, Theoretical; Nutrition; Nutritional Physiological Phenomena; phosphorus; Phosphorus, Dietary - metabolism; phytases; phytate; phytic acid; Phytic Acid - metabolism; pig; prediction; Research Article; sensitivity analysis; small intestine; statistical analysis; swine; Swine - growth & development; Swine - physiology
• ISSN: 1751-7311; 1751-732X; 1751-732X
• DOI: 10.1017/S1751731114001414

A deterministic, dynamic model was developed, to enable predictions of phosphorus (P) digested, retained and excreted for different pig genotypes and under different dietary conditions. Before confidence can be placed on the predictions of the model, its evaluation was required. A sensitivity analysis of model predictions to ±20% changes in the model parameters was undertaken using a basal UK industry standard diet and a pig genotype characterized by British Society Animal Science as being of ‘intermediate growth’. Model outputs were most sensitive to the values of the efficiency of digestible P utilization for growth and the non-phytate P absorption coefficient from the small intestine into the bloodstream; all other model parameters influenced model outputs by