Discussion
Intensification of aquaculture has led to the promotion of conditions
that favor the use of a wide range of chemicals, including
antibiotics (Rodgers and Furones, 2009). In the present
study, the O. niloticus in G3 and G2 showed significant increase
in final body weight (g), weight gain (g) and significant decrease
in food conversion ratio (FCR) when compared to the
control group. A similar trend was found by Sanchez-Martinez
et al. (2008) who studied the effect of supplemented Channel
Catfish (I. punctatus) feeds with oxytetracycline, they observed
that oxytetracycline-treated catfish exhibited a significant increase
in weight gain to values higher than those of controls,
suggesting a growth promotion action of this antibiotic agent.
The attribution of improvement of growth and feed efficiency
as a result of dietary antibiotic supplementation has been subjected
to a wide speculation by many investigators. Jukes et al.
(1956) mentioned that, the reduction in the gut wall and villus
lamina propria has been used to explain the enhanced nutrient
digestibility observed with antimicrobial growth promoters.
Waibel et al. (1991), Caston and Leeson (1992) reported that
Discussion
Intensification of aquaculture has led to the promotion of conditions
that favor the use of a wide range of chemicals, including
antibiotics (Rodgers and Furones, 2009). In the present
study, the O. niloticus in G3 and G2 showed significant increase
in final body weight (g), weight gain (g) and significant decrease
in food conversion ratio (FCR) when compared to the
control group. A similar trend was found by Sanchez-Martinez
et al. (2008) who studied the effect of supplemented Channel
Catfish (I. punctatus) feeds with oxytetracycline, they observed
that oxytetracycline-treated catfish exhibited a significant increase
in weight gain to values higher than those of controls,
suggesting a growth promotion action of this antibiotic agent.
The attribution of improvement of growth and feed efficiency
as a result of dietary antibiotic supplementation has been subjected
to a wide speculation by many investigators. Jukes et al.
(1956) mentioned that, the reduction in the gut wall and villus
lamina propria has been used to explain the enhanced nutrient
digestibility observed with antimicrobial growth promoters.
Waibel et al. (1991), Caston and Leeson (1992) reported that
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