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Non‐gelatinized corn supplemented with α‐amylase at sub‐optimum protein level enhances the growth of Labeo rohita (Hamilton) fingerlings
Author(s) -
Kumar Shivendra,
Sahu Narottam P,
Pal Asim K,
Choudhury Dharitri,
Mukherjee Subhas C
Publication year - 2006
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2005.01434.x
Subject(s) - amylase , labeo , biology , zoology , starch , net protein utilization , alpha amylase , food science , weight gain , protein efficiency ratio , body weight , biochemistry , fish <actinopterygii> , enzyme , endocrinology , fishery
A feeding trial was conducted for 60 days to delineate the effect of both gelatinized and non‐gelatinized corn with or without supplementation of exogenous α‐amylase at two level of protein 35% (optimum) and 27% (sub‐optimum) on growth, tissue composition and protein sparing effect of carbohydrate in the diet of Labeo rohita fingerlings. Three hundred and sixty fingerlings (average weight 10.00±0.15 g) were randomly distributed in 12 treatment groups with two replicates for each. Twelve semi‐purified diets containing either 35% or 27% CP were prepared with different levels of α‐amylase (0, 50, 100 and 150 mg kg −1 ) and starch type [gelatinized (G)/non‐gelatinized, (NG)] viz. T 1 (NG, 35% CP, 0 mg kg −1 α‐amylase), T 2 (G, 35% CP, 0 mg kg −1 α‐amylase), T3 (NG, 27% CP, 50 mg kg −1 α‐amylase), T 4 (NG, 35% CP, 50 mg kg −1 α‐amylase), T 5 (G, 27% CP, 50 mg kg −1 α‐amylase), T 6 (G, 35% CP, 50 mg kg −1 α‐amylase), T 7 (NG, 27% CP, 100 mg kg −1 α‐amylase), T 8 (NG, 35% CP, 100 mg kg −1 α‐amylase), T 9 (G, 27% CP, 100 mg kg −1 α‐amylase), T 10 (G, 35% CP, 100 mg kg −1 α‐amylase), T 11 (NG, 27% CP, 150 mg kg −1 α‐amylase) and T 12 (NG, 35% CP, 150 mg kg −1 α‐amylase). The fish were acclimatized to the experimental condition for 24 days during which control diet (NG, 35% CP) was fed. Weight gain percentage, specific growth rate, protein efficiency ratio and apparent net protein utilization of NG corn‐fed groups at 42.43% were significantly higher ( P <0.05) than the same level of G corn‐fed groups. We conclude that 42.43% NG corn supplemented with 50 mg α‐amylase kg −1 feed at sub‐optimum level of CP (27%) significantly enhanced the growth and protein in L. rohita fingerling. Addition of dietary α‐amylase to G corn had no added advantage on growth of L. rohita fingerling.