Efficacy of a genetically modified yeast phytase on phosphorus bioavailability in a corn [Zea mays]-soybean [Glycine max] meal based diet for growing pigs

We investigated the efficacy of genetically modified yeast (GMY) phytase on phosphorus (P) bioavailability in growing pigs fed a corn-soybean meal based diet. Crossbred barrows were fed a P-adequate, a low-P or a P-deficient diet containing 0.37, 0.27 and 0.14% non-phytase-P, respectively. The P-def...

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Bibliographic Details
Published in:Animal science journal 2008-08, Vol.79 (4), p.466-471
Main Authors: Chu, G.M.(Kyoto Univ. (Japan)), Komori, M, Nakayama, A, Asanagi, M, Yano, H, Matsui, T
Format: Article
Language:English
Subjects:
ADDITIF AUX ALIMENTS DES ANIMAUX
ADITIVOS DE PIENSOS
Bacteria
BARROWS
BIOAVAILABILITY
BIODISPONIBILIDAD
BIODISPONIBILITE
CERDO CASTRADO
Diet
FEED ADDITIVES
FITASA
FOSFORO
Genetic engineering
genetic modification
growing pig
Hogs
LEVADURA
LEVURE
PHOSPHORE
PHOSPHORUS
phosphorus bioavailability
PHYTASE
PORC CASTRE
yeast
YEASTS
Zoology
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Summary:We investigated the efficacy of genetically modified yeast (GMY) phytase on phosphorus (P) bioavailability in growing pigs fed a corn-soybean meal based diet. Crossbred barrows were fed a P-adequate, a low-P or a P-deficient diet containing 0.37, 0.27 and 0.14% non-phytase-P, respectively. The P-deficient diet was supplemented with wild-type yeast (WTY), Aspergillus (ASP) or GMY phytase at 750 PU per kilogram of food. Dietary ASP and GMY phytases increased plasma inorganic P (Psub(i)) concentration and the apparent absorption of P, and decreased the concentration of a bone resorption marker, plasma type-I collagen C-terminal telopeptide (ICTP). Wild-type yeast phytase also increased the apparent absorption of P, but the changes in plasma Psub(i) and ICTP concentrations were not significant. Although the dietary Psub(i)-equivalencies based on plasma Psub(i) and ICTP concentrations did not differ between WTY and ASP phytases, the equivalency of ASP phytase based on apparent absorption of P was higher than that of WTY phytase. The equivalency of GMY phytase calculated from each parameter was higher than that of WTY phytase, and did not differ from that of ASP phytase. These results suggest that efficacy of GMY phytase on P bioavailability was higher than WTY phytase, and as effective as ASP phytase in growing pigs.
ISSN:1344-3941
1740-0929
DOI:10.1111/j.1740-0929.2008.00551.x