During 5th Instar Development a Correlative Study on Changes in Concentration of Haemolymph Ascorbic Acid of Bivoltine Races of Bombyx Mori.L

Haemolymph ascorbic acid of 5th instar larvae of four (4) bivoltine races namely GEN-3, BCON-1, DUN-22, BCON-4 of Bombyx mori .L was studied out of four different verities of bivoltine races GEN-3 race showed best performance in haemolymph ascorbic acid content as well as certain economic characters like cocoon weight (CW), shell weight (SW) and Shell ratio percentage (SR%). Basing upon the above characters the efficiency of the silkworm races was considered.GEN-3 is showing the best performance and highly significant by ANOVA. The correlational study indicates that GEN-3, BCON-1, DUN-22 are highly significant than BCON-4. Their change in concentration of haemolymph ascorbic acid is gradually increased from first day to the 3rd day and it started declining from the 4th day up to the 7th day. The present study showed that there is a direct correlationship established between haemolymph ascorbic acid with body weight, cocoon weight and shell weight and shell ratio percentage. The above characters were important for the selection for hybridization as well as commercial rearing.