Application of virginiamycin as a growth promoter in male nile tilapia (Oreochromis niloticus Linn.)
1996
Marut Suksomjit
Application of virginiamycin as a growth promoter in maled nile tilapia (Oreochromis niloticus Linn.) at concentrations of 0, 40, 60 and 80 mg per kg of feed with high and low level of protein were investigated. Tilapia with average weight of 5.90 gms were raised in the cages hanging in the earthen pond with experimental diets for five months. The results indicated no significant difference on growth rate specific growth rate, feed conversion rate, survival rate, edible portion and body compositions amongst all experimental groups. Second study on tilapia with average weight of 3.90 gms in 100 liter aquaria with same experimental diets as the first study was conducted. Throughout the sixty day of experimental period, there were no significant difference on protein utilization amongst all experimental groups. Histopathological studies revealed similar thickness of the intestinal linings and similar deposition of glycogen and fat in the liver of all experimental groups. It can be concluded from this study that application of virginiamycin in diets containing high and low level of protein did not enhance the growth of maled nile tilapia.
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