Evaluation of superior silkworm (Bombyx mori L.) germplasm for post-cocoon traits.

摘要

Twelve short-listed bivoltine silkworm germplasm accessions of Central Sericultural Germplasm Resources Centre (CSGRC) Hosur, Tamil Nadu were evaluated for 16 post-cocoon parameters of qualitative and quantitative importance to identify the superiority of the silkworm germplasm accessions over ruling races viz., CSR-2 and CSR-4. The study revealed significant differences among the accessions for most of the parameters considered. Overall evaluation of germplasm accessions based on analysis of variance and Mano's trait evaluation index inferred that the accession BBE-187 was superior to CSR2 and CSR4 for fine denier and low evenness variation-I. The accession BBE-262 was found superior to CSR2 for fine denier, high neatness, low boil-off loss, low evenness variation-I, high tenacity and high elongation % and to CSR4 for fine denier, cleanness and low evenness variation-I. The overall analysis of the data revealed that the germplasm accessions, BBE-187 and BBE-262 could be used as potential donor parents in breeding programmes for improving post-cocoon traits or to gain heterosis in cross breed development.