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Food consumption and conversion efficiency of eri silkworm Samia ricini Donovan werestudied during 4th and 5th larval instars by feeding castor leaves fortified with 100, 200, 300,400 and 500 ppm concentrations of aqueous extracts of cyanobacteria Anabaena variabilis. The nutritional indices viz., ingesta, digesta, approximate digestibility (%), reference ratio andefficiency parameters like ECI and ECD were recorded which were significantly high at 400ppm concentration treated batches of 4th instar larvae over control batches. The decline innutritional efficiency parameters of 5th instar treated larvae might be due to higher utilization ofthe digested food for metabolic activities. Significant difference of ECI to cocoon % and nonsignificantdifference of ECD to cocoon% and shell were observed between the treatmentsand control. Cyanabacteria feed supplement contains antibiotic and nutritions factors whichhas reflective effect on the biological parameters in eri silkworm and therefore has greaterapplication in commercial eri silkworm rearing.

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