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Journal of Entomology
  Year: 2009 | Volume: 6 | Issue: 4 | Page No.: 188-197
DOI: 10.3923/je.2009.188.197
Evaluation and Identification of Superior Polyvoltine Crossbreeds of Mulberry Silkworm, Bombyx mori L.
C. Ramesha, S.V. Seshagiri and C.G.P. Rao

Abstract:
In the present study, the existing polyvoltine germplasm resource material of the Silkworm Breeding and Research and Development Institute (APSSRDI), screened for the desired qualitative and quantitative traits. After fixation of the desired traits, 5 inbred parental breeds (APM4, APM6, APM8, APM10, APM12) utilized as Lines for the preparation of 25 crosses in LinexTester method with the five bivoltine breeds (SDD1, SDD2, SDD3, APS12, APS105) as Testers. The hybrid testing was conducted and assessed for three different seasons for their performance on eight important economical genetic traits. The data obtained on the traits such as fecundity, yield per 10,000 larvae by number, single cocoon weight, shell weight, shell ratio, filament length and reliability was analyzed with the assistance of statistical tools. Based on two popular evaluation methods such as multiple traits Evaluation Index (EI) and Sub-ordinate Function (SF) methods, the 5 new hybrid combinations (APM12xAPDR105, APM6xAPS12, APM4xPDR105, APM10xSDD1 and APM10xSDD3) shown above 50 EI values with SF values varied from 5.663 to 7.596 were identified as superior over the control hybrid and recommended for large scale in laboratory trail. Further, based on the lab and field performance promising crossbreed will be identified and adjudicated for the commercial exploitation at farmers level.
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