National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present investigation was carried out regarding phenotypic and biological/economic parameters of six bivoltine silkworm breeds; ND2, ND3, NSP, Udhey-1, CSR2 and JD6 of Bombyx mori L. suited for sub-tropical conditions. Observations were made on fifteen economically important traits namely; fecundity, hatching percentage, brushing percentage, weight of 10 mature larvae, larval survival percentage, 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. The data was analyzed using Multiple Trait Evaluation index (E.I.) method. The perusal of the data reveals that the average E.I. value for egg characters ranged between 43.46(ND2) to 60.80(ND3). The average E.I value for larval traits varied in the range of 41.95(JD6) to 56.10(Udhey-1). For the cocoon paramaters, the average E.I. value was recorded from 46.81(JD6) to 54.00(Udhey-1).The average E.I. values for post cocoon parameters ranged between 43.71(NSP) to 56.53(ND2). On the basis of pooled E.I. values, Udhey-1(54.59),CSR2 (51.56),ND3(50.79) and ND2(50.20) surpassed the E.I. bench mark value of >50 and are considered suitable breeds for getting more economic returns from silkworm rearing.
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