Activity of digestive enzymes and growth parameters of juvenile jundiá (Rhandia quelen) fed linseed meal in nature and demucilaged

Abstract

This study was conducted out to evaluate the effect of partial replacement of animal protein (PBOA) for crude protein demucilaged linseed meal (PBFLD) and in nature (PBFL) in the diet of jundiá on growth parameters and digestive enzyme. The treatments were: control diet; 17%FL (linseed meal in nature):17% replacement of the PBOA by PBFL; 17%FLD (demucilaged linseed meal):17% replacement PBFLD by PBOA and 35%FLD: 35% replacement PBFLD by PBOA. Over seven week, 240 juvenile jundiá (14.49 ± 1.85 g) were reared in water recirculation system and fed to apparent satiation three times a day. At the end experimental parameters were evaluated for growth, carcass, chemical composition in whole fish and digestive enzymes. The fish fed control diet had best levels of feed conversion (p <0.05), however the remainder of the growth parameters were not altered by the inclusion of FL and FLD. There were no significant differences in hepatosomatic relation (RHS) and digestivosomatic relation (RDS). Diet 35%FLD had a lower intestinal quotient (QI), moisture content and higher carcass fat, total fat deposited and activity of the enzyme trypsin. It can be concluded that the FLD and FL can be used as a substitute of meat meal to the diets in juvenile jundia feed as an alternative source and cost.