Availability of Phosphorus in Various Phosphates to Carp and Rainbow Trout Determined by a Simple Fractionation Method
1997 Volume 63 Issue 2 Pages 297-300
Details
1997 Volume 63 Issue 2 Pages 297-300
The available phosphorus (P) content in various types of phosphates supplementedin semipurified diets at different levels was determined by the indirect method in common carp and rainbow trout, which have different digestive systems, and was compared with the amount of P extracted by deionized water (Fr. I), 80% acetic acid (Fr. II), and 0.25M hydrochloric acid (Fr. III) by fractionation, in order to simplify the estimation of available P content in fish feed.
Available P content in the experimental carp diets supplemented with various types of phosphates was almost equivalent to the amount of P extracted by deionized water (Fr. I) regardless to forms and levels of phosphates in the diets. The available P content in the rainbow trout diets supplemented with mono-or di-basic phosphate at the level of the P requirement was almost equal tothe amount of P extracted by deionized water alone. The available P content in the diet supplemented with tri-basic calcium phosphate was intermediate between the sum of Frs. I+II and Frs. I+II+III.
