Comparative effects of different vitamin C forms in diet for hybrid catfish (Clarias macrocephalus Gunther X C. gariepinus Burchell)
1997
Sarocha Roonsiri
Comparative effects of different vitamin C forms on hybrid catfish (Clarias macrocephalus) was studied by using 4 formulated feeds. Diet 1 added no vitamin C. Diet 2, 3 and 4 contained silicone coated vitamin C 40 ppm., ascorbyl-2-polyphosphate 33 ppm respectively. This study was designed to determine the comparative digestibility of three different vitamin C forms, as measured by analysis of ascorbic acid and two derivatives from feaces of 2 weeks fed on 4 different diets, hybrid catfish. Results show no significant difference (P0.05) in the average of ascorbic acid and its derivative levels. The second study was designed to determine the comparative biological efficacy, as measured by tissue deposition, of 3 different forms of vitamin C derivatives to hybrid catfish. Fish of 200 g in size were fed for 14 days on the different dietary treatment and dissected liver every 2 days for analysed tissue vitamin C. Results show no significant difference (P0.05) in the deposition of vitamin C in hybrid catfish liver between fish fed no vitamin C and fish fed a diet containing ascorbyl-2-sulfate. Fish fed diets containing ascorbyl-2-polyphosphate had signifacantly higher (0.01) liver vitamin C than all dietary groups of fish. It can be indicated that ascorbyl-2-sulfate was not effective in raising tissue ascorbic acid content in hybrid catfish. Comparative effects of different vitamin C forms on growth and survival than vitamin C groups.
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