Water-soluble vitamin requirements of yellow mystus (III): Study on vitamin C forms for mixing in the feed
1998
Kiriratnikom, S. | Phromkunthong, W. (Prince of Songkla Univ., Songkhla (Thailand). Faculty of Natural Resources. Dept. of Aquatic Science)
Yellow mystus (Mystus nemurus) fingerlings were fed purified diets containing 500 mg/kg of ascobic acid equivalent supplied either by L-ascorbic acid (AsA), ascorbyl-2-sulfate (AS), ascorbyl-2-polyphosphate (APP), ascorbyl-2-monophosphate (AMP), fat coated vitamin C (OC) or silicone coated ascorbic acid (ScA). Fish fed the ascorbate-free diet (basal) exhibited external signs of scurvy at 4 weeks, whereas signs of ascorbate deficiency were not observed in fish fed other diets. After 10 weeks, weight gain and percent survival were highest in fish fed AMP and AsA. Feed conversion ratio, protein efficiency ratio and apparrent net protein utilization were not significantly different among fish fed various forms of ascorbic acid supplemented diets but significantly higher than fish fed the ascorbate-free diet. Ascorbate concentration in liver and head kidney, histopathology of gill, liver and kidney confirmed that fish fed the ascorbate-free diet were scorbutic. Vertebral collagen content was not significantly different among treatments with different vitamin C forms. However, there was reduced vertebral collage content, a sensitive indicator of vitamin C deficiency, in fish fed the ascorbate-free diet. Hydroxyproline content in vertebral collagen in fish fed AsA and AMP were higher than a fish receiving other treatments, whereas this value was lower in fish fed the ascorbate-free diet. This study indicates that AMP has equimolar activity to AsA as an ascorbic acid source in promoting growth and preventing scurvy in yellow mystus.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Kasetsart University