Effects of dietary arginine levels on growth performance and body composition of juvenile grouper Epinephelus coioides
Identifieur interne : 000B67 ( Istex/Curation ); précédent : 000B66; suivant : 000B68Effects of dietary arginine levels on growth performance and body composition of juvenile grouper Epinephelus coioides
Auteurs : Z. Luo [République populaire de Chine] ; Y. Liu [République populaire de Chine] ; K. Mai [République populaire de Chine] ; L. Tian [République populaire de Chine] ; X. Tan [République populaire de Chine] ; H. Yang [République populaire de Chine]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2007-06.
Abstract
An 8‐week feeding trial was conducted to determine the effects of dietary arginine levels on growth performance and body composition of juvenile grouper Epinephelus coioides (initial weight: 16.10 ± 0.26 g per fish) in 500‐L indoor flow‐through circular fiberglass tanks. Diets contained six levels of l‐arginine ranging from 1.78% to 3.31% of dry diet in 0.30% increments. The diets, in which 25% crude protein came from fishmeal and soybean protein concentrate, and 23% from crystalline amino acids, were formulated to simulate the amino acid profile of 48% whole chicken egg protein except for arginine. Each diet was assigned to three tanks (20 fish per tank) in a completely randomized design. Grouper were fed to apparent satiation (about 5% body weight per day at the initial 1–4 weeks and 3% body weight per day in the following 5–8 weeks) twice daily on weekdays and once daily on weekends. Weight gain (WG) and specific growth rate (SGR) showed an incremental trend with increasing dietary arginine levels from 1.78% to 2.72% and remained thereafter relatively constant. Productive protein value (PPV) was poorest in fish fed the lowest arginine diet (P < 0.05) and showed no significant differences among other treatments (P > 0.05). Dietary arginine contents significantly influenced body composition. With the increase in dietary arginine, contents of total essential amino acids (EAAs), total non‐EAAs and total amino acids of whole body significantly increased (P < 0.05). The retention of dietary EAA in whole body of juvenile grouper was significantly influenced by dietary arginine. Arginine retention increased with increasing dietary arginine levels from 1.78% to 2.72%, then declined above the level of 2.7% (P < 0.05). Based on broken‐line regression analysis of WG against dietary arginine levels, the dietary arginine requirement of juvenile grouper E. coioides was determined as 2.7% of the diet (corresponding to 5.5% of dietary protein).
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DOI: 10.1111/j.1439-0426.2007.00857.x
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Luo</name><affiliation><mods:affiliation>Nutrition Laboratory, College of Fishery, Huazhong Agricultural University, Wuhan</mods:affiliation><wicri:noCountry code="subField">Wuhan</wicri:noCountry></affiliation><affiliation wicri:level="3"><mods:affiliation>Nutrition Laboratory, Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat‐sen University, Guangzhou</mods:affiliation><country>République populaire de Chine</country><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName><wicri:orgArea>Nutrition Laboratory, Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat‐sen University</wicri:orgArea></affiliation></author><author><name sortKey="Liu, Y" sort="Liu, Y" uniqKey="Liu Y" first="Y." last="Liu">Y. 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Diets contained six levels of l‐arginine ranging from 1.78% to 3.31% of dry diet in 0.30% increments. The diets, in which 25% crude protein came from fishmeal and soybean protein concentrate, and 23% from crystalline amino acids, were formulated to simulate the amino acid profile of 48% whole chicken egg protein except for arginine. Each diet was assigned to three tanks (20 fish per tank) in a completely randomized design. Grouper were fed to apparent satiation (about 5% body weight per day at the initial 1–4 weeks and 3% body weight per day in the following 5–8 weeks) twice daily on weekdays and once daily on weekends. Weight gain (WG) and specific growth rate (SGR) showed an incremental trend with increasing dietary arginine levels from 1.78% to 2.72% and remained thereafter relatively constant. Productive protein value (PPV) was poorest in fish fed the lowest arginine diet (P < 0.05) and showed no significant differences among other treatments (P > 0.05). Dietary arginine contents significantly influenced body composition. With the increase in dietary arginine, contents of total essential amino acids (EAAs), total non‐EAAs and total amino acids of whole body significantly increased (P < 0.05). The retention of dietary EAA in whole body of juvenile grouper was significantly influenced by dietary arginine. Arginine retention increased with increasing dietary arginine levels from 1.78% to 2.72%, then declined above the level of 2.7% (P < 0.05). Based on broken‐line regression analysis of WG against dietary arginine levels, the dietary arginine requirement of juvenile grouper E. coioides was determined as 2.7% of the diet (corresponding to 5.5% of dietary protein).</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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