Effect of Protein Hydrolysate-Fe2+ Complex on the Growth Performance and Non-specific Immune Parameters of Procambarus clarkii
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Abstract:
The purpose of this study was to investigate the effects of addition of protein hydrolysate-Fe2+ complex (TPH-Fe2+) to feed on the growth performance and non-specific immune parameters of Procambarus clarkii. After 60 days of consumption of the basal feed supplemented with 400~1000 mg/kg TPH-Fe2+, the survival rate, weight, specific growth rate, and meat yield were increased by 9.94%~10.10%, 8.55%~8.72%, 0.24%~0.29%/d and 2.39%~3.05%, respectively (P < 0.05), compared to the control group. When 800 and 1000 mg/kg TPH-Fe2+ were added to the feed, the crude protein and fat contents of P. clarkii increased significantly. After 30 days of consumption of the basal feed supplemented with 200 and 400 mg/kg TPH-Fe2+, superoxide dismutase (SOD), phenoloxidase (PO), lysozyme (LSZ), and acid phosphatase (ACP) activities in the serum and hepatopancreas did not differ significantly from those in the control group (P > 0.05). However, feed supplementation with 800 and 1000 mg/kg TPH-Fe2+ significantly increased the SOD, LSZ, and ACP activities (P < 0.05). After 60 days of feeding with 400 and 600 mg/kg TPH-Fe2+, the activities of SOD and LSZ were significantly enhanced, but the activities of PO and ACP were not significantly affected. When 800 and 1000 mg/kg TPH-Fe2+ were added to the feed, the SOD, PO, LSZ, and ACP activities were all significantly increased (P < 0.05). In conclusion, the addition of 800~1000 mg/kg TPH-Fe2+ to the basal feed could improve the growth performance of and activities of non-specific immune enzymes in P. clarkii .
