Biochemical Studies on Salmonidac. VIII

抄録

A coefficient of biological value of utilization (A) and an amount (x%) of dietary protein are in the relation as the following equation:
A=e^{-0.72-0.0235x}
A value of A is, therefore, gradually decreased with increasing of x.
Ax indicates a value of real utilization of dietary protein and it shows the maximum value when x=42.5₅%.
Then, although the value of utilization (Ax) should be ascended until x=42.5, a ratio of increase of Ax to that of x is not equal at every point, i. e. values of Ax/(Ax)_max-x/(Ax)_max or Ax/7.67-x/42.5₅ increase, at first, and then descend to zero on that point, and the maximum point of these values is in the case of x18.
The author designated that point “Economical Maximum Point of Utili-zation of Dietary Protein”.
From the results, an economical protein content of an artificial diet use in feeding trout-fry may be 20%-30%.
In conclusion I desire to express my thanks to Mr. Sato and Mr. Hoshino for their heepful abvice in this work.