Evaluation of egg preservation schedules for bivoltine breeds of the mulberry silkworm, Bombyx mori L.

摘要

 Two newly developed bivoltine silkworm breeds SK6 and SK7 were evaluated at Silkworm Seed Technology Laboratory, Kodathi, Bangalore by preserving the eggs for 4, 6, 8 and 10 months preservation schedules following 10, 20, 40 and 60 days aestivation period respectively. The results indicated that fecundity ranged from 519 to 574 and 531 to 573, hatching percentage ranged from 92.39 to 96.30 % and 92.99 to 97.60, effective rate of rearing (ERR) ranged from 9075 to 9560 and 8941 to 9445, pupation percentage ranged from 91.70 to 96.88 and 89.70 to 95.99 %, cocoon weight ranged from 1.528 to 1.647 and 1.584 to 1.626 g, cocoon shell weight ranged from 0.244 to 0.284 and 0.269 to 0.279 g and cocoon shell percentage ranged from 15.97 to 17.53 and 16.65 to 17.61 % in SK6 and SK7 respectively. The hatchability and rearing performance of SK6 and SK7 were almost similar in 4, 6, 8 and 10 months preserved eggs. Both bivoltine silkworm breeds SK6 and SK7 were test verified in the field through Basic Seed Farms of National Silkworm Seed Organization (NSSO), Central Silk Board and the cocoon yield ranged from 50 to 75 kg and 51 to 71.840 kg/100 dfls in SK6 and SK7, respectively