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Evaluation of Indigenous and Introduced Bivoltine Silkworm Breeds Along With Identification of Promising Heterotic and Hybrids

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. Moreover, silkworm breeds/hybrids which perform consistently good under adverse climatic conditions are considered as stable. In order to introduce bivoltine races in a temperate country, it is necessary to have stability in cocoon crop under high-temperature environments. Silkworm breeding is a continuous process to achieve a goal by bringing genetic improvement through recombination of genes by crossing two pure stocks. Cross breeding is extensively used in silkworm improvement as a mean of exploiting heterosis. Heterosis breeding has been recognized as the most suitable methodology for augmenting cocoon yield in silkworm. The required goal of increasing cocoon productivity in quickest possible time can be achieved through heterosis only. The phenomenon of heterosis and its utility in silkworm studies are widely popular and the estimates of heterosis over mid-parent value will be useful in measuring the genetic potential of hybrid combinations.