Author(s):

Mokshe Sajgotra, RK Bali and Ravinder Sharma

Abstract: The investigation was carried out to evaluate the twenty-eight silkworm bivoltine hybrids raised by involving half (8 × 8) diallel set of bivoltine breeds in order to identify the thermotolerant, adaptable, high yielding hybrids suited for sub-tropical climate. The evaluation of hybrids was done on heterosis worked at mid parent value. Maximum heterosis was depicted by non-breakable filament length (37.75) followed by filament length (35.62), cocoon yield (by weight) (35.22), larval weight (28.21), single shell weight (24.46) and cocoon weight (17.10). On the basis of significant heterosis displayed for thirteen important commercial parameters, four hybrid combinations ND₅ × PO₁ (Cumulative heterosis 362.83), ND₅ × PO₃ (Cumulative heterosis 323.17)_, PO₁ × Udhey-6 (Cumulative heterosis 291.31) and PO₁ × Udhey-3 (Cumulative heterosis 250.42) were identified to be heterotic. The superiority of these hybrids was further confirmed by Evaluation Index (E.I.) method. Hybrid ND₅ × PO₃ (E.I. 55.61) ranked 1^st followed by ND₅ × PO₁ (E.I. 54.40) and PO₁ × Udhey-6 (E.I. 51.97)_. The control hybrid (SH₆ × NB₄D₂) scored the cumulative heterosis value of 155.36 and the average E.I. value of 39.17 only.

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