Journal
AQUACULTURE NUTRITION
Volume 17, Issue 2, Pages E583-E594Publisher
WILEY
DOI: 10.1111/j.1365-2095.2010.00799.x
Keywords
cystine replacement value; fingerling Labeo rohita; requirement; sulphur amino acid
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Funding
- DST-FIST, New Delhi
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Two feeding experiments were conducted to quantify the total sulphur amino acid (TSAA) requirement and replacement value of cystine for methionine for fingerling Labeo rohita. In Experiment I, isonitrogenous (380 g kg(-1) CP) and isocaloric (17.90 kJ g(-1) GE) amino acid test diets with graded levels of methionine (4, 6, 8, 10, 12, 14 g kg(-1) dry diet) and 0.4 g kg(-1) cystine were fed to fish (4.62 +/- 0.2 cm; 0.66 +/- 0.1 g) and methionine requirement determined by analysing absolute weight gain (AWG) (5.48), feed conversion ratio (FCR) (1.26), protein retention efficiency (PRE%) (39%) and energy retention efficiency (ERE%) (85%) data which were best at 10 g kg(-1) methionine of dry diet. In Experiment II, six diets with different ratios of L-cystine and L-methionine on equimolar sulphur basis were fed to fish (4.71 +/- 0.1 cm; 0.69 +/- 0.2 g) under identical conditions. Maximum AWG (5.58), best FCR (1.24), PRE (41%) and ERE (86%) in fish fed Diet IV indicated cystine replacement value to be 40%. On the basis of the broken-line and second-degree polynomial regression analyses of results obtained in Experiments I and II, it is concluded that inclusion of TSAA in the range of 25.2-31.31 g kg(-1) of protein is optimum of which 33-39% could be spared by cystine.
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