Modulation of phosphorus digestive utilization in weanling pigs : influence of dietary calcium and phytase on gastro-intestinal digesta pH and mineral solubility - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Journal of Animal Science Année : 2012

Modulation of phosphorus digestive utilization in weanling pigs : influence of dietary calcium and phytase on gastro-intestinal digesta pH and mineral solubility

Résumé

The study was conducted to evaluate the impact of dietary calcium (Ca) concentration, added in the form of calcium carbonate (CaCO3), on phosphorus (P) digestibility and gastro-intestinal digesta pH and soluble mineral concentration in weanling pigs fed diets with or without microbial phytase. A 3 × 2 factorial arrangement was used with maize-soybean meal based diets formulated to contain combinations of 3 concentrations of Ca: 0.50, 0.75 and 1.00% with or without the addition of 1000 FTU of microbial phytase/kg. After a 5-d adaptation period under a standard diet, 40 male weanling pigs were blocked by weight and allotted to one of the 6 dietary treatments in a 29 d experiment. The addition of microbial phytase improved (P < 0.001, +20.1 points) P digestibility regardless of dietary Ca concentration. In addition, P digestibility was linearly decreased (P < 0.001, −4.30 points) when increasing dietary Ca. Dietary Ca concentration and microbial phytase did not affect the pH of the different digestive compartments. Nevertheless, the pH of the different segments followed an increasing proximo-distal gradient (segment, P < 0.001): 4.69, 5.62, 6.66 and 7.10 pH units respectively for the stomach, the duodenum, the jejunum and the ileum. A negative quadratic relation was observed between the gastric pH and the proportion of soluble inorganic P (iP) and Ca. In the same segment, phytase improved the solubility of iP depending on dietary Ca concentration (Ca x phytase, P < 0,001). Indeed, the addition of microbial phytase increased the proportion of soluble iP (% total P) by 20.2, 9.30 and 8.90 points in diets containing 0.50, 0.75 and 1.00% of dietary Ca respectively. The present results suggest that the increase of dietary Ca concentration may affect the solubility of phytates in the stomach reducing in this way their hydrolysis by phytase. Nevertheless, this step did not appear to be limiting regarding the enzyme efficacy in ameliorating P digestibility.
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Dates et versions

hal-01210630 , version 1 (02-10-2015)

Identifiants

  • HAL Id : hal-01210630 , version 1
  • PRODINRA : 265195

Citer

Agnès Narcy, Marie-Pierre Letourneau-Montminy, Eddy Bouzouagh, Nathalie Meme, M. Magnin, et al.. Modulation of phosphorus digestive utilization in weanling pigs : influence of dietary calcium and phytase on gastro-intestinal digesta pH and mineral solubility. ADSA/ASAS Joint Annual Meeting, Jul 2012, Phoenix, United States. ASAS - American Society of Animal Science, Journal of Animal Science, 90 (Suppl. 3), 2012, Journal of Animal Science. ⟨hal-01210630⟩
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