:: Volume 18, Issue 4 (2019) ::
IJFS 2019, 18 Back to browse issues page
Effects of soy protein base diet supplemented with lysine and methionine on digestive enzymes activity and hematological parameters in silvery-black porgy (Sparidentex hasta) juveniles
M. Yaghoubi *, M. Torfi mozanzadeh, J. Ghafle Marammazi, O. Safari, E. Gisbert
Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organzation (AREEO), Ahwaz, IRAN. , m.yaghoubi@ut.ac.ir
Abstract:   (616 Views)

The effect of dietary partial replacement of fish meal (FM) with soybean protein (SP) alone or in combination with lysine (Lys) and methionine (Met) supplementation were tested in a 60-day feeding trial for silvery-black porgy (Sparidentex hasta) juveniles. Seven isoproteic (ca. 50% crude protein) and isoenergetic (ca. 22.4 MJ kg-1) diets were formulated in which 45% (SP45), 60% (SP60) and 75% (SP75) of FM protein were replaced by SP and the control diet (FM) was prepared with FM as the major source of protein. In SP45+, SP60+ and SP75+ diets, 45 to 75% of FM was replaced by SP with supplementing blends of Lys and Met (98% of purity). The activities of the trypsin, lipase and α-amylase were higher in fish fed SP diets with crystalline amino acids supplementation than in the other groups (p<0.05). Fish fed SP75 and SP75+ diets had the lowest red blood cell count and hematocrit level (p<0.05). The results of the current study indicated that anti-nutritional factors in a soy-protein based diet rather than lysine and methionine deficiencies may have adverse effects on digestive enzymes activities and health condition in silvery-black porgy juveniles.

Keywords: Soy protein, Lysine, Methionine, Digestive enzymes activity, Hematology, Sparidentex hasta
Full-Text [PDF 389 kb]   (267 Downloads)    
Type of Study: Orginal research papers | Subject: aquaculture
Received: 2016/09/4 | Accepted: 2016/12/4

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Volume 18, Issue 4 (2019) Back to browse issues page