RESUMO. Este estudo teve como objetivo avaliar os efeitos da inclusão de diferentes níveis de farelo de canola em rações, sobre o desempenho e composição de carcaça de juvenis de tilápia do Nilo (Oreochromis niloticus L.), linhagem Chitralada. Foram utilizadas 15 caixas de polipropileno com capacidade para 310L, com dez peixes por unidade. Os peixes foram alimentados à saciação com cinco rações isoprotéicas (28%) e isocalóricas (2900 Kcal ED/Kg), duas vezes ao dia, durante seis meses. O farelo de canola foi utilizado em quatro níveis (TT=0%, T1=8%, T2=16%, T3=24%, e T4=32%/dieta), em um delineamento inteiramente casualizado com cinco tratamentos e três repetições. Os valores obtidos foram submetidos à análise de variância (ANOVA) e as médias comparadas pelo teste de Tukey (p<0,1). Ocorreram diferenças (p<0,1) para ganho de peso e taxa de crescimento específico e para o índice porcentagem de proteína no ganho de peso entre T4 e os demais tratamentos. Os tratamentos não tiveram efeito (p>0,1) sobre a composição corporal dos peixes, sendo que os níveis de 16% e 24% de farelo de canola proporcionaram os melhores ganhos de peso. Conclui-se que a utilização do farelo de canola é viável quando incluído em até 24% na ração para a tilápia do Nilo, linhagem Chitralada.Palavras-chave: Oreochromis niloticus, desempenho produtivo, farelo de canola, fonte protéica.ABSTRACT. Canola meal for juvenile Nile tilapia, Chitralada strain. This work evaluated the inclusion of several levels of canola meal in ration used in the development and carcass compositions of juvenile Nile tilapia (Oreochromis niloticus L.), Chitralada strain. Were used 15 polypropylene boxes, with 310 liters (10 fish each). The fish were fed with five isonitrogenous (28%) and isocaloric ration (2900 Kcal EM/kg), twice a day for six months. The canola meal was used in four levels (TT = 0%, T1 = 8%, T2 = 16%, T3 = 24% and T4 = 32% / diet), in a completely randomized design, with 5 treatments and three repetitions each. The data obtained were submitted to variance analysis (ANOVA) and the averages compared by the Tukey test (p<0,1). Differences occurred in the weight gain and the specific grow rates. The protein percentage index was different for the weight gain, between T4 and the other treatments. Treatments didn't have effect (p>0,1) on fishes body composition, however had best body weight gain with canola meal on levels 16% and 24%. These values seem to show that for the Nile Tilapia, Chilatrada strain, the use of canola meal is viable when included in up to 24% of the diet, without any performance loss.
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