Application of virginiamycin as a growth promoter in walking catfish (Clarias macrocephalus Gunther)
1992
Anek Sopon
Experiment on using virginiamycin (VM) at 0, 20, 40, 60, 80 and 100 mg per kg of feed (part per million) was conducted with walking catfish (Clarias macrocephalus Gunther) with an initial average weight of 2.0 gms. The results indicated that catfish recieving 60 ppm of VM had the best growth rate, specific growth rate and survival rate. Moreover, they were found to have the least number of bacteria in the intestine. The main species of bacteria in the intestine were Aeromonas hydrophila, Escherichia coli, Salmonella typhi and Shigella flexneri. After 16 week of experimentation catfish that were fed with 60 ppm of VM had the best feed conversion rate but there were non significant difference among the edible portion percentages. Pathological studies of an intestine and liver revealed no significant difference on the thickness of the intestinal wall among all experimental fish, however, the liver of catfish fed with 60 and 80 ppm of VM appeared to accumulate more glycogen than other experimental groups. Analysis of body composition indicated the highest percentage of protein and fat in the catfish were fed with 60 ppm of VM. Water qualities from the experimental pond did not have the impact on the growth rate of the experimental catfish.
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