3.7. Protein efficiency ratio
The protein efficiency ratios of the experimental diets are presented
in the Table 6. The highest protein efficiency ratios were
obtained by using the soluble powders (DS, from 1.46 to 1.48) followed
by a group containing the insoluble powders (DI, from 1.32
to 1.37) and at least the mixed proteins powders (DM, from 1.15 to
1.26). DM feed excepted, all have allowed similar or higher protein
efficiency ratio than the control diet (1.27). In addition, the feed formulated
by using the soluble proteins (DS) were found better on
this parameter than the commercial diet (1.33).
All the results of this study indicated that the control diet formulated
with tuna head meal had an effect on growth and survival of
shrimps similar to that provided by the commercial diet except for
the relative weight gain which was statistically lower.
Whatever the studied parameters and according to the statistical
comparison procedure, the diets containing the soluble protein powders
(DS2, DS3 and DS6) were found at least equivalent and sometimes superior to the commercial diet. With regard to the diets
containing insoluble protein powder, the diet DI2 was found to be
statistically equivalent to the commercial diet. However, the diet
DI3 was detrimental in terms of relative weight gain and the diet
DI6 resulted in lower survival rates. Finally, the zootechnical performance
(i.e. survival rate, weight gain, feed conversion ratio and protein
efficiency ratio) of the diets formulated with mixture of protein
powders was significantly worse than that of commercial diet.
3.7. Protein efficiency ratio
The protein efficiency ratios of the experimental diets are presented
in the Table 6. The highest protein efficiency ratios were
obtained by using the soluble powders (DS, from 1.46 to 1.48) followed
by a group containing the insoluble powders (DI, from 1.32
to 1.37) and at least the mixed proteins powders (DM, from 1.15 to
1.26). DM feed excepted, all have allowed similar or higher protein
efficiency ratio than the control diet (1.27). In addition, the feed formulated
by using the soluble proteins (DS) were found better on
this parameter than the commercial diet (1.33).
All the results of this study indicated that the control diet formulated
with tuna head meal had an effect on growth and survival of
shrimps similar to that provided by the commercial diet except for
the relative weight gain which was statistically lower.
Whatever the studied parameters and according to the statistical
comparison procedure, the diets containing the soluble protein powders
(DS2, DS3 and DS6) were found at least equivalent and sometimes superior to the commercial diet. With regard to the diets
containing insoluble protein powder, the diet DI2 was found to be
statistically equivalent to the commercial diet. However, the diet
DI3 was detrimental in terms of relative weight gain and the diet
DI6 resulted in lower survival rates. Finally, the zootechnical performance
(i.e. survival rate, weight gain, feed conversion ratio and protein
efficiency ratio) of the diets formulated with mixture of protein
powders was significantly worse than that of commercial diet.
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3.7. Protein efficiency ratio
The protein efficiency ratios of the experimental diets are presented
in the Table 6. The highest protein efficiency ratios were
obtained by using the soluble powders (DS, from 1.46 to 1.48) followed
by a group containing the insoluble powders (DI, from 1.32
to 1.37) and at least the mixed proteins powders (DM, from 1.15 to
1.26). DM feed excepted, all have allowed similar or higher protein
efficiency ratio than the control diet (1.27). In addition, the feed formulated
by using the soluble proteins (DS) were found better on
this parameter than the commercial diet (1.33).
All the results of this study indicated that the control diet formulated
with tuna head meal had an effect on growth and survival of
shrimps similar to that provided by the commercial diet except for
the relative weight gain which was statistically lower.
Whatever the studied parameters and according to the statistical
comparison procedure, the diets containing the soluble protein powders
(DS2, DS3 and DS6) were found at least equivalent and sometimes superior to the commercial diet. With regard to the diets
containing insoluble protein powder, the diet DI2 was found to be
statistically equivalent to the commercial diet. However, the diet
DI3 was detrimental in terms of relative weight gain and the diet
DI6 resulted in lower survival rates. Finally, the zootechnical performance
(i.e. survival rate, weight gain, feed conversion ratio and protein
efficiency ratio) of the diets formulated with mixture of protein
powders was significantly worse than that of commercial diet.
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