Author(s):

Kritika Sharma and Kamlesh Bali

Abstract: The present investigation was carried out to evaluate thirty-one silkworm bivoltine hybrids including control by involving full diallel set of six bivoltine breeds (ND₂, ND₃, NSP, U₁, CSR₂ and JD₆) in a complete randomized design (CRD) along with ruling bivoltine hybrid, CSR₂ × CSR₄. Thirty-one treatments including control were replicated thrice with 200 worms per replicate post III^rd moult. Observations were made on fifteen economically important traits namely; fecundity, hatching percentage, brushing percentage, weight of 10 mature larvae, larval survival, cocoon yield per 10,000 larvae (by weight and by number), good cocoon, pupation, single cocoon weight, single shell weight, shell ratio, total filament length, non-breakable filament length and filament size. Based on the cumulative E.I. values for fifteen commercial characters, ranking of hybrids was conducted and eight hybrids viz. ND₂ × CSR₂, ND₂ × NSP, ND₃ × NSP, ND₂ × ND₃, ND₃ × CSR₂, NSP × JD₆, ND₃ × JD6 and NSP × CSR₂ qualified E.I. value > 50. Three hybrids viz., ND2 × CSR2 ranked 1st (55.53) followed by ND₃ × NSP (55.33) and ND₂ × NSP (53.93) are recommended as promising and heterotic hybrids to be exploited at commercial level after multi location trials.

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