Effect of protein levels and sources on growth performance, survival rate, feed utilization and body chemical composition of bayad (bagrus bajad)‎ fingerlings

الملخص EN

A factorial experiment 2 × 2 was conducted to investigate the effect of protein level (30% and 35% crude protein) with two protein source (50% Animal protein, AP: 50% Plant protein, PP and 33% AP: 67% PP) on growth performance, feed utilization, body chemical composition and survival rate of Bayad (Bagrus bajad) fingerlings.

Survival rate was within the range 96.67–100 % .

The highest growth parameters and the best FCR (lowest) were obtained with the diet contained on (35% CP and 50% AP: 50% PP).

The diet contained (30% CP and 33% AP: 67% PP) had the lowest growth and the worst FCR than other treatment.

However differences in growth parameters among diets contained on (30% CP, 50% AP: 50% PP) and (35% CP, 33% AP: 67% PP) were insignificant (P0.05).

Final body weight was progressively decreased with increasing plant protein under both protein level of diets.

The improvement of growth performance and feed conversion ratio tested in diets containing higher levels of fish meal under both protein level of diets.

The highest body protein content was with diet contained on (30% CP and 33% AP: 67% PP).

The diet contained on (30% CP and 50% AP: 50% PP) had the lowest body protein content and the highest body ether extract content than other treatment.

The lowest ether body extract content was with diet contained on (30% CP and 33% AP: 67% PP).

It could be concluded that 35 % and 30% crude protein level was the best under composition of diet ((50 AP: 50 PP) in terms of growth performance, feed utilization and economical evaluation under this experimental conditions.