Effects of dietary Ca/P ratio, P level and microbial phytase supplementation on nutrient digestibilities in growing pigs: precaecal, post-ileal and total tract disappearances of OM, P and Ca

Eight female pigs (26-61 kg) provided with a simple T-cannula about 10 cm proximal to the ileo-caecal valve, were used in two experiments to investigate the effects of Ca/P ratio, P level and supplementation with phytase (500 FTU/kg) on precaecal, post-ileal and total tract disappearances of organic...

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Bibliographic Details
Published in:Journal of animal physiology and animal nutrition 2000-02, Vol.83 (1), p.36-48
Main Authors: Seynaeve, M, Janssens, G, Hesta, M, Nevel, C. Van, Wilde, R.O. De
Format: Article
Language:English
Subjects:
ABSORCION DIGESTIVA
ABSORPTION DIGESTIVE
CALCIO
CALCIUM
CERDO
DIGESTIBILIDAD
DIGESTIBILITE
DIGESTIBILITY
DIGESTIVE ABSORPTION
FEEDING LEVEL
FITASA
FOSFORO
MATERIA ORGANICA
MATIERE ORGANIQUE
NIVEAU D'ALIMENTATION
NIVEL ALIMENTICIO
ORGANIC MATTER
PHOSPHORE
PHOSPHORUS
PHYTASE
PORCIN
SWINE
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Summary:Eight female pigs (26-61 kg) provided with a simple T-cannula about 10 cm proximal to the ileo-caecal valve, were used in two experiments to investigate the effects of Ca/P ratio, P level and supplementation with phytase (500 FTU/kg) on precaecal, post-ileal and total tract disappearances of organic matter (OM), phosphorus (P) and calcium (Ca). In experiment 1, two Ca/P ratios and two P levels were tested according to a 2 x 2 factorial arrangement within a Latin square design. In experiment 2, the diets of experiment 1 were supplemented with phytase (500 FTU/kg). There was a substantial absorption of OM, P and Ca in the post-ileal tract for all diets. Precaecal and total tract disappearances of OM were reduced by phytase addition (-4.4 and -0.8%, respectively). Supplementation with phytase resulted in an improvement of total tract and post-ileal P disappearances by 10.3 and 12.1%, respectively, without affecting precaecal P disappearance. Addition of feed phosphate resulted in a higher precaecal disappearance of P (+10.8%), resulting in a higher total tract disappearance of P (+5.9%). Addition of limestone had little effect on disappearances of OM, P and Ca, but reduced activity of supplemental phytase and had a negative influence on growth performance. Precaecal, post-ileal and total tract Ca disappearances were hardly affected by the examined dietary factors. The results might indicate that P from feed phosphate is absorbed primarily prececally and that P from phytate, liberated by microbial phytases, is dominantly absorbed post-illeally.
ISSN:0931-2439
1439-0396
DOI:10.1046/j.1439-0396.2000.00246.x