Título:	Protein to energy ratios and cost, performance, and ammonia excretion in juvenile jundiá (Rhamdia quelen), South American catfish.
Autoria:	FREITAS, L. E. L. de SILVA, T. S. de C. FRACALOSSI, D. M.
Afiliação:	LUIZ EDUARDO LIMA DE FREITAS, CNPASA; TARCILA SOUZA DE CASTRO SILVA, CPAO; DÉBORA MACHADO FRACALOSSI, UNIVERSIDADE FEDERAL DE SANTA CATARINA.
Ano de publicação:	2021
Referência:	Scientia Agricola, v.78, Suppl., e20200288, 2021.
Conteúdo:	The determination of nutritional requirements, based on diets administered in practice, considers physiological specificities and sustainability are essential to the development of suitable aquaculture technologies for novel fish species. The growth of jundiá (Rhamdia quelen Quoy and Gaimard) juveniles (31.54 ± 4.92 g) fed five diets comprising increasing levels of digestible protein (DP: 24, 29, 34, 39, and 44 %) and digestible energy (DE: 12.13, 13.39, 13.81, 14.64, and 15.06 MJ kg-1) with DP:DE ratios: 20, 22, 25, 27, and 29 g MJ k-1, respectively, was evaluated. Each diet was fed to three groups of 25 fish for 75 days. Regression analysis showed that the different DP:DE ratios affected both growth and economic performance as well as excretion of total ammonia nitrogen. Fish fed diets with DP:DE ratios between 22 and 27 g MJ k-1 achieved a higher daily weight gain, superior apparent net protein utilization, feed conversion rates, and lower feed costs. For the economically viable and environmentally friendly farming of jundiá juveniles in the initial grow-out stage (30 to 80 g average weight), the best DP:DE ratio was 25 g MJ K-1 DP:DE (34.05 % DP and 13.81 MJ kg-1 DE).
Thesagro:	Peixe Rhamdia Quelen Nutrição Animal Nitrogênio
NAL Thesaurus:	Catfish Excretion Nitrogen Nutritional adequacy
Palavras-chave:	DP-DE
ISSN:	1678-992X
Digital Object Identifier:	http://doi.org/10.1590/1678-992X-2020-0288
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPASA)