Journal
REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE
Volume 38, Issue 11, Pages 2099-2105Publisher
REVISTA BRASILEIRA ZOOTECNIA BRAZILIAN JOURNAL ANIMAL SCI
DOI: 10.1590/S1516-35982009001100004
Keywords
aminoacids; ideal protein; Oreochromis niloticus; proteic nutrition
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The effect of digestible lysine levels was evaluated in diets for Nile tilapia fingerlings (Oreochromis niloticus), Thailand lineage, based on the ideal protein concept. Four hundred and thirty two Nile tilapia fingerlings with in initial body weight of 0.98 +/- 0.03 g were allotted in a randomized complete design, with six treatments, six replications per treatment and twelve fish per experimental unit. The treatments consisted of six isoenergetic (3.000 kcal of DE/kg feed) and isoproteic (39.14% CP) diets with different levels of digestible lysine (1.50, 1.66, 1.82, 1.98, 2.14 and 2.30%). Feed intake. digestible lysine intake, average weight gain, specific growth rate, survival rate. feed conversion, daily protein deposition rate. daily fat deposition rate, chemical body composition (moisture, protein and fat content) and nitrogen retention efficiency were evaluated. The different levels of lysine improved linearly the parameters of digestible lysine intake, feed conversion. body protein content and body protein deposition. The Linear Response Plateau model best fitted the parameters of feed consumption. average weight gain. specific growth rate and nitrogen retention efficiency, estimating at 2.06%, 2.17, 2.14 and 2.12% respectively, the level of digestible lysine to maximize each of the parameters. The digestible and total digestible lysine requirement for Nile tilapia fingerlings wits 2.17% (0.723%/Mcal of DE) and 2.32% (0.773%/Mcal of DE), respectively, to meet the main performance parameters and carcass traits, when the ideal protein concept was used in diet formulation.
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