Author(s): KC Nayak, SC Rath, SS Giri and KN Mohanta

Abstract: Dhaincha (Sesbania aculeata) is a leguminous shrub of Fabaceae family, distributed all over India. The dhaincha seed (DS) is rich in protein (30%) and energy (4.6 kcal/g). It contains 6.0% of ether extract. The fatty acid comprises ∑SFA, 11.92 %; ∑MUFA, 19.11%; ∑PUFA, 62.78%: ∑n-6, 57.33%, ∑n-3, 5.45% and ∑FA, 93.81%. Phenol, tannin, saponin, alkaloids and phytic acid are the secondary metabolites detected qualitatively. Labeo rohita fry (0.3±0.01 g) were fed with five iso-nitrogenous (27% CP) diets containing DS at 0% (D-1), 20% (D-2), 40% (D-3), 60% (D-4) and 80% (D-5) for 60 days in an indoor system. Fry survival (%) of D-1 to D-3 groups were statistically similar (p>0.05) among the group but significantly higher (P<0.05) than D-4 and D-5. Weight gain (%) and specific growth rate (SGR; %/day) were similar (P>0.05) among D-1 to D-3 but significantly higher (P<0.05) than D-4 and D-5 groups. Feed conversion ratio (FCR) was significantly lower (P<0.05) in D-2 and D-3 as compared to the other groups (D-1, D-4 and D-5). Protein efficiency ratio (PER) was significantly higher (P<0.05) in D-2 and D-3 as compared to rest groups. While the whole body protein was significantly higher (P<0.05) in D-1, D-2 and D-3 groups, the lipid content was significantly reduced (P<0.05) as the incorporation rate of DS was increased. The apparent dry matter and protein digestibility (%) at 40% level incorporation (D-3) found to be significantly higher (P<0.05) among all the groups. The study results indicated that there is scope to incorporate dhaincha seed in the in the diet of L. rohita up to 400 g kg-1 without any adverse effect on growth, survival and nutrient utilization.

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