Identification of bivoltine breeds and hybrids of the Mulberry Silkworm, Bombyx mori L.

[摘要]  Identification of promising bivoltine breeds and hybrids of the mulberry silkworm, Bombyx mori L. was carried out utilizing three different statistical tools namely, multiple traits evaluation indices, combining ability and hybrid vigour.Out of six bivoltine silkworm breeds, DNB1 was found promising exhibiting maximum values based on its performance and multiple traits evaluation indices exhibiting maximum values for six characters viz., hatching %, pupation rate, cocoon shell %, filament length, raw silk percentage and neatness followed by DNB6 which exhibited higher values for three characters viz., cocoon yield/10,000 larvae by weight, cocoon weight and cocoon shell weight. DNB1 showed its superiority by exhibiting maximum GCA effects for seven characters. Among twenty four hybrids, DNB1 × CSR2recorded maximum rearing performance values for four characters viz., cocoon shell weight, cocoon shell %, filament length and raw silk % followed by two hybrids DNB6 × CSR2 and DNB7 × CSR2 exhibiting maximum values for two characters each. Different hybrids exhibited higher values for special combining ability (SCA). DNB4 × CSR4 manifested higher hybrid vigour for pupation rate, cocoon yield/10,000 larvae by weight and cocoon shell weight

[学科分类] 昆虫学

[关键词] Bombyx mori;Combining ability;Hybrid vigour;Multiple traits evaluation indices;Performance;Bivoltine silkworm breeds and hybrids