• Rubia Bukhari
• R.K.Bali

The morphological characterization among domesticated insect like silkworm (Bombyx mori L.) is an important aspect for selection of suitable parents for breeding programme. The present study was conducted on twenty bivoltine silkworm breeds to estimate the extent of relationship by morphological characterization. Eighteen morphological traits both quantitative and qualitative viz., Egg shape, Chorion colour, Colour of the newly hatched larva, Larval marking, Cocoon colour, Cocoon shape, Pupa colour and Shape, Colour of male and female moth, Fecundity, Hatching percentage, Larval weight 5th day, Ⅴth instar duration, Total larval period, Percentage of malformed cocoons, Pupation rate, Single cocoon weight, Single shell weight and Shell percent were studied and data revealed significant variability among the breeds. Promising breeds were short listed and identified by using multiple trait Evaluation Index method for qualitative and quantitative characters. On the basis of highest cumulative evaluation values (> 50) for ten quantitative economically commercial characters, ten breeds; ND3, ND5, CSR19, PO1, SPO, UDHEY-3, PO3, ND2, CSR18 and NSP were short listed. These breeds scored higher cumulative evaluation values (> 50) and have been identified as promising breeds. They are recommended for further breeding to boost bivoltine silk production; and could also be used for developing high yielding, sustainable and productive breeds.

Silkworm, morphological characterization, bivoltine breeds, Coefficient Correlation, Evaluation Index, Yield.

"Performance wise evaluation of the morphological traits of bivoltine silkworm (Bombyx Mori L.) Breeds in sub- tropical conditions.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 3, page no.154-169, March-2019, Available :http://www.jetir.org/papers/JETIR1903E27.pdf

"Performance wise evaluation of the morphological traits of bivoltine silkworm (Bombyx Mori L.) Breeds in sub- tropical conditions.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 3, page no. pp154-169, March-2019, Available at : http://www.jetir.org/papers/JETIR1903E27.pdf