Six isonitrogenous (350 g kg A1 crude protein) and isoenergetic (17573 kJ kg A1) experimental diets incorporating raw and fermented sesame (Seasamum indicum) seed meal at 200, 300, and 400 g kg A1 into a ®shmeal based diet were fed to rohu Labeo rohita ®ngerlings for 60 days and the growth performance and feed utilization eciency of the ®sh was studied. The antinutritional factor phytic acid, from raw sesame seed meal, could be reduced below detection limit by fermentation with lactic acid bacteria (Lactobacillus acidophilus). Fermentation of the oilseed meal resulted in reduction of the tannin content from 20 to 10 g kg A1. In terms of growth response, feed conversion ratio and protein eciency ratio, a diet containing 400 g kg A1 fermented sesame seed meal resulted in a signi®cantly (P < 0.01) best ®sh performance. In general, growth and feed utilization eciencies of ®sh fed fermented sesame seed meal diets were superior to those fed raw oilseed meal diets. Apparent protein digestibility (APD) values decreased with increasing levels of raw oilseed meal. APD was, however, signi®cantly (P < 0.01) higher at all levels of incorporation of fermented sesame seed meal, while diets containing raw oilseed meal resulted in poor protein and lipid digestibility. Carcass protein and lipid contents of ®sh fed fermented sesame seed meal diets increased with increasing level of incorporation, being highest with 400 g kg A1 fermented oilseed meal-containing diet. The results showed that sesame seed meal may be incorporated in carp diets up to 200 g kg A1 and 400 g kg A1 in raw and treated (fermented) forms respectively.
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