细纤度三眠蚕品种853白、543B的育成与推广

Breeding of Trimoltine Race With Superfine Silk Size,853Bai and 543B of Bombyx mori

用眠性稳定而经济性状较差的三眠蚕品种和综合经济性状优良的四眠蚕品种作亲本进行杂交 ,育成了经济性状优良 ,眠性稳定的三眠蚕实用品种“85 3白”、“5 4 3B”。经配合力测定 ,选配出的 85 3白× 5 4 3B杂交组合 ,强健好养、眠性稳定 (三眠率达到 98%～ 99% )、全龄经过短、茧丝纤度 1 87～ 2 .2dtex、茧丝长 90 0～ 110 0m、解舒率 75 %～ 90 %、洁净 94～ 96分、生丝强力 3 7～ 3 8g/dtex,符合缫制细纤度高品位生丝原料茧的要求。

New practical trimoltine silkworm race,853Bai and 543B,characterized with fine economical parameters and stable moltinism has been bred after crossing of pure trimoltine strains characterized by stable moltinism and poor economical parameters with tetramoltine strains characterized by good comprehensive economical parameters.The selected hybridized combination,853Bai×543B,showed much advanced characters by combining ability test,such as healthy,stable moltinism(tremolter rate:98%～99%),short duration of larval period,superfine silk size(1.87～2.2 dtex),900～1 100 m in silk filament,75%～90% in reelability,94～96 in neatness of raw silk and 3.7～3.8 g/dtex in strength of raw silk.It is proved for suitable to produce high quality of raw silk cocoons for some special purpose.