Relação lisina digestível: proteína digestível em rações para tilápias-do-nilo
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Data
2009
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Resumo
This study was carried out to determine the best digestible protein/digestible lysine ratio that should be
present in feed fed to Nile tilapias. Two hundred and sixteen tilapias (11.0 ± 0.43g) were distributed in 36 fish tanks (205 L)
at a density of 6 fish/tank. Twelve feeds were formulated with three different digestible protein (DP) levels 22.0; 26.0 and
30.0% (based on digestible amino acids) and four different lysine percentages of 4.5; 6.0; 7.5 or 9.0% in relation to digestible
protein. The fish were fed ad libtum during a 60-day period. There was significant effect of the digestible protein and
digestible lysine ratio on weight gain, because the increase in lysine levels in feeds with 26 and 30% DP promoted linear
increase in this parameter. The best values for feed conversion were obtained at the levels 26 and 30% DP that increased
the daily consumption of digestible protein. The lysine level caused a linear reduction in feed conversion and linear increase
in the protein efficiency rate. The results suggested that the 26% DP level might be used in ration to feed Nile tilapia juveniles;
however, these should contain digestible amino acids and the digestible lysine/digestible protein ratio should be 6.0%.
However, for levels higher than 26% DP, a maximum digestible lysine level of 7.5% DP improved weight gain for the species.
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Palavras-chave
Aminoácido, Lisina, Nutrição, Oreochromis niloticus, Proteína ideal, Amino acids, Ideal protein, Lysine, Nutrition
Citação
GONÇALVES, Giovani Sampaio et al. Relação lisina digestível: proteína digestível em rações para tilápias-do-nilo. Revista Brasileira de Zootecnia, Viçosa, v. 38, n. 12, p. 2299-2305, 2009.