Retenção de proteína e energia em juvenis de "black bass" Micropterus salmoides
Eurico Possebon Cyrino, José; Portz, Leandro; Cavalcanti Martino, Ricardo.
Sci. agric.
; 57(4)2000.
Artículo
en Portugués
| VETINDEX | ID: vti-439439
To determine dietary protein and energy retention of juvenile largemouth bass one thousand, three hundred and fifty feed-conditioned fish (average weight 14.46 ± 0.81 g) were stocked in 60-L cages set up in 1,000 L containers, and fed for 64 days with a dry, extruded feed containing varying levels of crude protein - CP (34, 38, 42, 46, 50 and 54%) and energy (3,600 to 4,100 kcal kg-1 feed, with increases of 125 kcal kg-1). The trial was set up in a totally randomized 6 x 5 factorial design (n=3). Data on weight gain, daily feed consumption, hepatosomatic index, viscerosomatic index, nutrient protein, energy retention, liver glycogen and visceral fat were evaluated. There were no interaction effects (P > 0.05) between feed energy and protein levels in respect to all evaluated parameters. Best performance was attained with levels of 42% CP and 3,850 kcal kg-1 in the diets, a condition which resulted in higher levels of liver glycogen (P 0.0442) and higher hepatosomatic indexes (P 0.0001) usually when diets presented less than 30% starch. Higher levels of dietary lipid induced significant increases in whole body lipids considering dietary energy (P 0.0001), and this also induced higher deposition of visceral fat for pooled means of dietary protein (P 0.0001) and energy (P 0.0021) contents. These results will help understanding the nutritional energetics of carnivorous fish, increasing the feasibility of their intensive production.
Biblioteca responsable:
BR68.1
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