| Response of European sea bass (Dicentrarchus labrax) to graded levels of methionine (total sulfur amino acids) in soya protein-based semi-purified diets. | |
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MedLine Citation:
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PMID: 20416128 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The dietary methionine (Met) and total sulfur amino acid (TSAA) requirements of European sea bass (Dicentrarchus labrax) (initial body weight 13.4 (SD 0.2) g) were estimated in a 12-week dose-response experiment. Seven isonitrogenous (7.6 % DM) and isoenergetic (gross energy, 21.2 MJ/kg DM) diets, based on soya protein and crystalline L-amino acids containing graded levels of L-Met (1.6-16.2 g/kg) at a constant cysteine (4 g/kg) level and a fish meal-based diet, were fed each to triplicate groups of fifty fish kept in 250 litre tanks in a thermoregulated (23 +/- 0.5 degrees C) seawater system. The Met and TSAA-deficient diet resulted in higher mortality, impaired feed intake and growth relative to the other treatments (P < 0.01). No signs of lens opacity due to limiting Met intake were observed and no feed intake or growth depression occurred at the highest level of dietary TSAA. Met and TSAA requirements for optimal N deposition or weight gain as fitted with the broken-line model resulted in estimated values of 8.0 and 12.0 g/kg diet (for example, 1.8 and 2.7 % dietary protein) and 9.1 and 13.1 g/kg diet (for example, 2.0 and 3.0 % dietary protein), respectively. Plasma levels of Met, homocysteine and cysteine increased in response to excess dietary TSAA, corroborating requirement estimates from growth data. N gain resulted in a linear function of TSAA consumption at marginal Met (TSAA) intake. The TSAA intake needed to maintain N balance resulted in a value of 20.0 mg TSAA/kg average body weight0.75 per d, which represents 23 % of the total (maintenance+accretion) requirement. |
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Authors:
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Francesca Tulli; Maria Messina; Matteo Calligaris; Emilio Tibaldi |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-04-26 |
Journal Detail:
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Title: The British journal of nutrition Volume: 104 ISSN: 1475-2662 ISO Abbreviation: Br. J. Nutr. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-25 Completed Date: 2010-09-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0372547 Medline TA: Br J Nutr Country: England |
Other Details:
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Languages: eng Pagination: 664-73 Citation Subset: IM |
Affiliation:
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Department of Animal Science, University of Udine, Via Sondrio 2, 33100 Udine, Italy. francesca.tulli@uniud.it |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acids, Sulfur
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administration & dosage*,
blood Animal Feed Animals Bass / growth & development, metabolism* Cysteine / administration & dosage, blood Diet* / adverse effects Dose-Response Relationship, Drug Energy Intake Homocysteine / blood* Lens, Crystalline / drug effects Methionine / administration & dosage*, blood Nitrogen / metabolism Nutritional Requirements* Soybean Proteins / administration & dosage, metabolism* Weight Gain |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids, Sulfur; 0/Soybean Proteins; 454-28-4/Homocysteine; 52-90-4/Cysteine; 63-68-3/Methionine; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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