Abstract
Five local and two imported hybrids were used. The hybrids were evaluated according to heterosis over mid, better and check parent value. As well as evaluation index and subordinate function value for cocoon weight (CW), cocoon shell weight (CSW), pupal weight (PW), cocoon shell ratio (CSR), silk productivity (SP) for females and males. fifth instar duration (Fd), total larval duration (LD), mortality percentage (MP), number of cocoon per liter (C/L), cocooning percentage (CP), pupation ratio (PR), cocoon crop by number (crop/No) and weight (Crop/W), fecundity (Fecund) and fertility (Fertili). There isn't any hybrid earned the best heterosis over mid parent and better parent value for all traits together. HY A hybrid has the best heterosis for most characters understudy over mid and better parent values. Generally, HY A exhibited hybrid vigour over check parent value of G1 and G2 of most characters under study. Hybrid HY A has the best results for most traits under investigation. About the mean of evaluation index for hybrids understudy, best data registered for HY A, HY B, G2 and G1. Also, hybrid HY A registered the highest value of the subordinate function for most traits. Cumulative subordinate function raveled that G2, HY A, G1 and HY B hybrids acquired the highest results, respectively.
Highlights
Natural silk has a unique location in the world
HY A hybrid has the best heterosis for most characters understudy over mid and better parent values
The performance of hybrid HY A is best than the imported hybrid G1 for cocoon weight (CW), cocoon shell weight (CSW), pupal weight (PW), cocoon shell ratio (CSR), silk productivity (SP) for females and males
Summary
Bombyx mori L., is a very important economic insect. It produces silk fiber which reckons a queen of textiles. Many breeders practice breeding programs through hybridization and selection which considered an important tool to improve the economic characters of silkworm breeds. The major aims of the breeding program are bespoke hybrids of mulberry silkworm to rearers which produce higher and sustain crops in different climate conditions. Silkworm breeds/hybrids which perform consistently good under adverse climatic conditions are considered as stable. The prerequisite of summer hybrid is healthiness and adaptability to adverse conditions of high temperature, low food quality, relatively higher economic traits, with the potential for increased cocoon production (Suresh Kumar et al, 2011)
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