Digestible protein requirements for maintenance, growth, and efficiency of protein utilization in pacu (Piaractus mesopotamicus) juveniles: an exponential nitrogen utilization model

Autor(es)

Mansano, Cleber F. M. ^[1] ; Silva, Edney P. ^[2] ; Khan, Kifayat U. ^[3] ; Macente, I, Beatrice ; Nascimento, Thiago M. T. ^[3] ; Sakomura, Nilva K. ^[2] ; Fernandes, Joao B. K. ^[3] ; Takahashi, Leonardo S. ^[4]

Afiliação do(s) autor(es)

^[1] I, Brazil Univ, Campus Fernandopolis, Fernandopolis, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Fac Agr & Vet Sci FCAV, Jaboticabal, SP - Brazil

^[3] Sao Paulo State Univ UNESP, Aquaculture Ctr, Jaboticabal, SP - Brazil

^[4] Sao Paulo State Univ UNESP, Coll Agr & Technol Sci FCAT, Dracena, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Latin American Journal of Aquatic Research; v. 49, n. 4, p. 608-619, 2021.
• Citações Web of Science: 0

Resumo

The present study aimed to estimate digestible protein (DP) requirements for maintenance and growth and assess the efficiency of protein utilization in pacu (Piaractus mesopotamicus) juveniles. A complete randomized design consisted of seven treatments, and five replicates (tanks) per treatment was used. After a one-week acclimation period, 350 pacu juveniles of 27.48 +/- 1.8 g (initial average body weight - BW) were equally distributed among 35 tanks (10 fish per tank) of 450 L. Fish were fed with seven graded digestible protein levels (64.5, 111.8, 164.6, 217.1, 264.4, 316.2 and 369.5 g kg(-1)) three times a day until apparent satiation for 120 days. The monomolecular model parameters including nitrogen maintenance requirement (NMR) (37.76 mg BW0.67 kg(-1) d(-1)), daily nitrogen deposition (ND) (194.8 mg BW0.67 kg(-1) d(-1)), and protein intakes (based on metabolic BW) of 1638, 1902, and 2241 mg kg(-1)BW(0.67) d(-1) for 75, 80 and 85% maximum theoretical nitrogen retention (NRmaxT), respectively and the efficiency of protein utilization (529x10(-6)) were estimated through the relationship between nitrogen intake (NI) and ND. The digestible protein requirements for 75, 80, and 85% of NRmaxT were estimated as 187, 217, and 256 g kg(-1) respectively by the monomolecular model based on the daily feed intake of 2% of live BW of pacu juveniles. (AU)

• Processo FAPESP: 13/25761-4 - Modelagem da produção e das exigências nutricionais de aves e peixes
• Beneficiário: Nilva Kazue Sakomura
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/11016-3 - Método de determinação da composição corporal de peixes in vivo pelo uso da técnica não-invasiva
• Beneficiário: Cleber Fernando Menegasso Mansano
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado