%0 Journal Article
%T Exig¨ºncia de metionina + cistina para alevinos de Til¨¢pia do Nilo (Oreochromis niloticus)
%A Furuya
%A Wilson Massamitu
%A Silva
%A Lilian Carolina Rosa
%A Neves
%A Patr¨ªcia Ribeiro
%A Botaro
%A Daniele
%A Hayashi
%A Carmino
%A Sakaguti
%A Eduardo Shiguero
%A Furuya
%A Val¨¦ria Rossetto Barriviera
%J Ci¨ºncia Rural
%D 2004
%I Universidade Federal de Santa Maria
%R 10.1590/S0103-84782004000600041
%X this study was carried out to determine the methionine + cystine requirement for nile til¨¢pia, fingerlings (2.61 ¡À 0.14g). a randomized block designs, with six treatments, three replicates and five fish by experimental unit was used. basal diet was utilized with 28% crude protein and 3173de kcal kg-1 of digestible energy, supplemented with dl-methionine, resulting in diets with 0.87; 0.95; 1.03; 1.11; 1.19 and 1.27% of methionine + cystine. diets were fed to satiation during 41 days. no effects (p>0.05) of methionine + cystine levels on survival rate and hepatosomatic index were observed. a quadratic effect (p<0.05) for weight gain was observed, which increased up to 1.22% methionine + cystine in the diet. feed conversion ratio and protein efficiency ratio increased (p<0.05) up to 1.00% of methionine + cystine. a quadratic effect (p<0.05) of methionine + cystine level on carcass yield was observed, which increased up to 1.13% of methionine + cystine. the concentration of 1.00% methionine + cystine corresponding to 3.54% crude protein, in the presence of 0.54% methionine in the diet, showed the best njperformance.
%K performance
%K requirement
%K juvenile
%K methionine + cystine
%K nile tilapia.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-84782004000600041&lng=en&nrm=iso&tlng=en