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Twenty nine newly evolved bivoltine pure breeds maintained at the germplasm stock of Satellite Silkworm Breeding Station of Central Silk board, Coonoor, sixteen oval breeds and thirteen dumbbell breeds, were selected as resource material for the study. The breeds were reared in two seasons, studied their efficiency on rearing and reeling performance based on fourteen cocoon and silk yield parameters; seven each of pre-cocoon, viz., fecundity, fifth age larval duration, total larval duration, pupation rate,  single cocoon weight, single shell weight, shell percentage  and post cocoon traits - average filament length (AVFL), non breakable filament length (NBFL), denier, renditta, reelability, and neatness. Using these bivoltine breeds  (viz., sixteen oval cocoon breeds viz., CSR 2, D1, D2,  D 7,  CSR 202, CSR 204, CNR 5, CNR 14,  CNR 15,  SLD 1,  SLD 2,  SLD 4,  Gen 1,  Gen 3, CSR 50   and   thirteen dumbbell cocoon breeds -  CNR 3,  SLD 6,  SLD 8,  SLD 9,   D 11,   D 13,   D 15,  D 17,  GEN 2,  4 C,  CSR 6,  CSR 26,  CSR 51) forty seven new foundation crosses were prepared in P.O. x P.O   (Plain larvae & Oval cocoons)  and M. D. x M.D (marked larvae & dumbbell cocoons) fashion among them in all possible combinations of direct crosses. Two Foundation Crosses- FC1 (CSR6 x 26) for dumbbell foundation crosses and FC2 (CSR 2x 27) for oval foundation crosses were kept as control and evaluated the rearing performance of 49 FCs (47 new FCs and 2 control) for two seasons.  Analyzed the data  on rearing  and reeling parameters  and  short listed them to 14 Foundation crosses for further evaluation and preparation of double hybrids.

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