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- Title
Dietary methionine requirement of pre-adult blunt snout bream, ( Megalobrama amblycephala Yih, 1955).
- Authors
Liang, H.‐L.; Ren, M.‐C.; Habte‐Tsion, H.‐M.; Mi, H.‐F.; Ge, X.‐P.; Xie, J.; Xi, B.‐W.; Zhou, Q.‐L.; Miao, L.‐H.
- Abstract
A nine-week feeding trial was conducted to test the hypothesis that an adequate methionine diet might improve growth, feed utilization, body composition and physiology, and biochemical parameters in pre-adult blunt snout bream Megalobrama amblycephala, whereas a methionine deficiency might have adverse effects on these parameters. Six isonitrogenous and isoenergetics semi-purified diets (33.0% crude protein, 7.0% crude lipid) were formulated to contain graded methionine levels (0.39-1.54% of dry weight) at 0.25% increments replaced by equal proportions of glycine. Results show that the survival rate ( SR) was not significantly affected by the dietary methionine level. Final weight ( FW), feed efficiency ratios ( FER), weight gain ( WG), and specific growth rate ( SGR) increased with increasing dietary methionine levels up to 1.00% and then showed a declining trend. Using quadratic regression analysis of FER and SGR, the dietary methionine requirement was estimated to be 0.74% (2.24% of dietary protein) and 0.76% of the diet (2.30% of dietary protein), respectively. Fish fed the 0.39% methionine diet showed significantly lower whole body protein content compared to those fed with 0.85, 1.00 and 1.24% methionine diets (P < 0.05). Whole body moisture, lipid, and ash contents in pre-adult adult blunt snout bream were not significantly affected. The urea content in fish fed the 0.85% methionine diet was significantly higher than those of fish fed a 0.39, 0.56, 1.24, 1.54% methionine diet (P < 0.05), but not significantly different in fish fed the 1.00% methionine diet (P > 0.05). No significant differences were found in other indexes such as the hepatosomatic index ( HSI), viscerosomatic index ( VSI), condition factor ( CF), albumin ( ALB), total protein ( TP), alanine aminotransferase ( ALT), and spartate transaminase ( AST) (P > 0.05). Most important, the optimal dietary methionine level of pre-adult blunt snout bream should be 0.74-0.76% of the diet (2.24-2.30% of dietary protein).
- Subjects
FISH feeds; METHIONINE; GLYCINE; REGRESSION analysis; LOW-protein diet
- Publication
Journal of Applied Ichthyology, 2016, Vol 32, Issue 6, p1171
- ISSN
0175-8659
- Publication type
Article
- DOI
10.1111/jai.13117