Abstract
This investigation was carried out to utilize cottonseed cake in formulatingdiets for common carp Cyprinus carpio L. fish in an attempt to substitute forsoybean meal. Cottonseed cake was treated with multi enzyme (Avizyme) andautoclaving. A 105 fish carp with average weight (26 ±2 gm/fish) of had beendistributed randomly at seven experimental diets, with three replicates replicationfor each diet. The fish fed for 70 days on experimental diets which containeddifferent rates of cottonseed cake; zero% (control diet, diet 1) and three dietscontained 25%, 32.5% and 41% of cottonseed cake of the total diet (2,3 and 4)respectively instead of 50 % ,66.66 % and 83.33 % of soybean meal a long withadded multi enzymes while the last three diets contained 25%, 32.5% and41% respectively treated cottonseed cake with (5, 6 and 7) autoclave respectively .The Statistical analysis of results showed there were no significant differences inthe weight gain, growth rate and relative growth rate among control diet, The bestvalues for food conversion ratio and food efficiency ratio were recorded forfish which fed on diet 5. There were no significant differences ( p> 0.01) amongfish that fed at different experimental diets for protein efficiency ratio except forfish fed on diet 5 .The precipitate protein for fish fed at diet 2 and 5 were exceeded as compared with fish fed at diet 1 and the character of the protein productivevalues (PPV) were 23.16, 29.44 and 29.47% for the above mention three dietsrespectively. The chemical analysis of body composition were performed( crude protein, ether extract, ash ) for fish fed on experimental 4 diets .It can beconcluded that replacing 83.33% of treated cottonseed cake by either Avizyme orautoclaving is possible in formulation in common carp diets as adverse effect on thestudied growth faster for fish wasn’t evident .
