[Effect of a supplemental Aspergillus niger phytase on the utilization of plant phosphorus by rainbow trout (Oncorhynchus mykiss)].
Effects of a supplemental Aspergillus niger-phytase on digestibility and utilization of dietary phosphorus (P) were studied in three experiments with rainbow trout. P concentration in the diets was 4.8 and 5.8 g/kg DM, respectively. The P contained in the diet originated solely from plants, mainly soy-products. Digestibility of P was studied using the stripping method and hydrochloride insoluble ash as marker. Utilization was studied in growth trials by use of the comparative body analysis. At a water temperature of 15 degrees C, both digestibility and utilization of P were increased from 25 to 57% and from 17 to 49%, respectively when 1000 U/kg phytase were supplemented. Feed consumption and gain of trout were significantly increased. At a water temperature of 10 degrees C, utilization of P was also increased from 6 to 25%. However, feed consumption and gain of trout were very low at this water temperature and not influenced by the supplemental phytase.
Institut für Tierernährung, Universität Bonn, Germany.
M
M
Rodehutscord
A
A
Becker
E
E
Pfeffer
D010832:6-Phytase; D000821:Animal Feed; D000818:Animals; D001234:Aspergillus niger / Q000201:enzymology*; D004063:Digestion; D005527:Food, Fortified; D017686:Oncorhynchus mykiss / Q000502:physiology*; D010758:Phosphorus / Q000378:metabolism*; D010944:Plants
D010758:Phosphorus; D010832:6-Phytase
Einfluss des Zusatzes einer Aspergillus niger-Phytase auf die Verwertung Pflanzlichen Phosphors durch die Forelle (Oncorhynchus mykiss).