Abstract
Abstracts The present study was conducted to evaluate the effects of different dietary gamma-aminobutyric acid (GABA) levels in Nile tilapia, Orechromis niloticus. Six groups of fish averaging 3.03 ± 0.07 g (mean ± SD) were randomly distributed in 18 rectangular tanks in triplicates. A basal diet without GABA supplementation was used as a control (CON), and the other five diets were prepared by adding 75 mg GABA (GABA144), 75 mg GABA +50 mg heat-killed Lactobacillus paracasei (GABA189L), 150 mg GABA (GABA197), 150 mg GABA +50 mg heat-killed Lactobacillus paracasei (GABA242L), and 600 mg GABA (GABA507) per kg of diet. Actual GABA compositions for CON, GABA144, GABA189L, GABA197, GABA242L and GABA507 diets were 96, 144, 189, 197, 242 and 507 mg kg−1, respectively. After 8 weeks of experiment, weight gain, specific growth rate, feed efficiency and protein efficiency ratio of fish fed GABA189L were significantly higher than those of fish fed CON and GABA5.7 diets (P
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