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Meta-analysis of phosphorus utilization by growing pigs: effect of dietary phosphorus, calcium and exogenous phytase

Published online by Cambridge University Press:  16 March 2012

M. P. Létourneau-Montminy ,
C. Jondreville ,
D. Sauvant  and
A. Narcy
M. P. Létourneau-Montminy
Affiliation:
Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec J1M 1Z3, Canada
C. Jondreville
Affiliation:
INRA, Nancy-Université, USC 340 Animal et Fonctionnalités des Produits Animaux, F-54500 Vandoeuvre-lès-Nancy, France
D. Sauvant
Affiliation:
INRA, AgroParisTech, UMR791 Physiologie de la Nutrition et Alimentation, F-75231 Paris, France
A. Narcy*
Affiliation:
INRA, UR83 Recherches Avicoles, F-37380 Nouzilly, France
*
†E-mail: anarcy@tours.inra.fr
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Abstract

Optimizing phosphorus (P) utilization in pigs requires improving our capacity to predict the amount of P absorbed and retained, with the main modulating factors taken into account, as well as precisely determining the P requirements of the animals. Given the large amount of published data on P utilization in pigs, a meta-analysis was performed to quantify the impact of the different dietary P forms, calcium (Ca) and exogenous phytases on the digestive and metabolic utilization criteria for dietary P in growing pigs. Accordingly, the amount of phytate P (PP) leading to digestible P (g/kg) was estimated to be 21%, compared with 73% for non-phytate P (NPP) from plant ingredients and 80% for NPP from mineral and animal ingredients (P < 0.001). The increase in total digestible dietary P following the addition of microbial phytase (PhytM) from Aspergillus niger (P < 0.001) was curvilinear and about two times higher than the increase following the addition of plant phytase, which leads to a linear response (P < 0.001). The response of digestible P to PhytM also depends on the amount of substrate, PP (PhytM2 × PP, P < 0.001). The digestibility of dietary P decreased with dietary Ca concentration (P < 0.01) independently of phytase but increased with body weight (BW, P < 0.05). Although total digestible dietary P increased linearly with total NPP concentration (P < 0.001), retained P (g/kg), average daily gain (ADG, g/day) and average daily feed intake (ADFI, g/day) increased curvilinearly (P < 0.001). Interestingly, whereas dietary Ca negatively affected P digestibility, the effect of dietary Ca on retained P, ADG and ADFI depended on total dietary NPP (NPP × Ca, P < 0.01, P < 0.05 and P < 0.01, respectively). Increasing dietary Ca reduced retained P, ADG and ADFI at low NPP levels, but at higher NPP concentrations it had no effect on ADG and ADFI despite a positive effect on retained P. Although the curvilinear effect of PhytM on digestible P increased with PP (P < 0.001), this effect was lessened by total NPP for ADG and ADFI (PhytM × NPP and PhytM2 × NPP, P < 0.05) and depended on both total NPP and Ca for retained P (PhytM2 × NPP × Ca, P < 0.01). This meta-analysis improves our understanding of P utilization, with major modulating factors taken into account. The information generated will be useful for the development of robust models to formulate environmentally friendly diets for growing pigs.

Keywords

calciumgrowing pigsmeta-analysisphosphorusphytase
Type
Full Paper
Information
animal , Volume 6 , Issue 10 , October 2012 , pp. 1590 - 1600
Copyright
Copyright © The Animal Consortium 2012

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