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India is a country with tropical climate and multivoltine silkworm strains play important role in the production of silk, however low productivity and poor fibre quality continued to impair increase in silk production. In this context development of cross breeds (multivoltine x Bivoltine) has gained importance over the years owing to field constraints, fluctuations in the environmental conditions as well as socio economic compulsion. Due to the improved technologies and machinery, there is vast improvement in the post cocoon characters. In this study, we compared important post cocoon characters/parameters, shell ratio, filament length, reelability, renditta, raw silk percent, raw silk recovery, neatness and waste of popular cross breed varieties PM x CSR2 and Nistari x CSR2 with that of pure mutivotine races to establish improved post cocoon parameters of the cross breeds. The significance in improvement was analyzed using Students t-test to show variation in the post cocoon characters between the cross breeds and multivoltine races. Some characters like neatness and reelability were almost equal to that of bivoltine races. The Pearson correlation was employed to analyse the relation between different traits. The relation was significant and showed positive correlation between eight characters, except waste and renditta showed negative correlation with other characters. The quality of silk produced from theses cross breeds were highly improved and showed 2A gradable silk. Therefore, the results indicate the scope for developing potential cross breeds with improved yield characters, particularly filament characters to support the Indian sericulture industry.

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Aravind, S.

Central Silk Technological Research Institute (CSTRI), Madivala, Bangalore-560068, Karnataka, INDIA

Sahar Ismail

Seri Biotech Research Laboratory, Kodathi, Bangalore 560035 Karnataka, INDIA

Hariraj

Central Silk Technological Research Institute (CSTRI), Madivala, Bangalore-560068, Karnataka, INDIA

K.S. Tulsi Naik*

Seri Biotech Research Laboratory, Kodathi, Bangalore 560035 Karnataka, INDIA

A.R.  Pradeep

Seri Biotech Research Laboratory, Kodathi, Bangalore 560035 Karnataka, INDIA

R.K Mishra

Seri Biotech Research Laboratory, Kodathi, Bangalore 560035 Karnataka, INDIA

Subhash. V. Naik

Central Silk Technological Research Institute (CSTRI), Madivala, Bangalore-560068, Karnataka, INDIA

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Reference

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