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| Porto,Neliane Galvão; Ribeiro,Felipe Barbosa; Siqueira,Jefferson Costa de; Bomfim,Marcos Antonio Delmondes; Marchão,Rafael Silva; Costa,Dayana da Conceição da. |
| ABSTRACT Methionine is an essential amino acid, and generally, the first limiting one in the diets of tambaqui, the main native fish produced in continental aquaculture in South America. However, there is a lack of information on their amino acid requirement, especially for maintenance and efficiency of utilization. The present study aimed to determine the requirement of [methionine plus cystine] for the maintenance and efficiency of utilization using tambaqui of different body weights. Two experiments were carried out using 250 tambaqui with weights of 100 and 300 g. They were distributed in a completely randomized design with four treatment groups (0.264, 0.396, 0.528, and 0.660% of digestible [Met + Cys]), five replications. The control treatment (CT)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sulfur amino acids; Colossoma macropomum; Factorial method; Amazon fish. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100302 |
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| Bomfim,Marcos Antonio Delmondes; Marchão,Rafael Silva; Ribeiro,Felipe Barbosa; Siqueira,Jefferson Costa de; Silva,Louis Ramos; Takishita,Sylvia Sanae. |
| ABSTRACT The objective of this study was to determine the digestible tryptophan requirement of tambaqui (Colossoma macropomum) fingerlings and its relationship with digestible lysine. A total of 300 tambaqui fingerlings with three initial weights (2.12 ± 1.19, 8.13 ± 0.75, and 15.18 ± 1.91 g) were distributed in a randomized complete block design, consisting of six treatments (0.225, 0.256, 0.288, 0.319, 0.350, and 0.381% of digestible tryptophan) and five replicates of 10 fish per plot. The tryptophan to lysine ratio was estimated using a 1.78% level of digestible lysine. Variables regarding performance, food efficiency, and body deposition of protein, fat, and ashes, and nitrogen retention efficiency were evaluated. Feed intake and nitrogen retention... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Essential amino acids; Corporal composition; Zootechnical performance; Amazon fish. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000200405 |
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