显性三眠蚕品种SG选育初报

用眠性稳定、经济性状较差的显性三眠蚕品种和主要经济性状优良的实用四眠蚕品种作亲本，进行杂交，育成了经济性状优良、眠性稳定的三眼蚕品种SG。并将SG与现行实用四眠蚕品种54A、871组配成SG×54A、SG×871，2对三眠蚕杂交种，表现强健好养、眠性稳定（三眠率达到98％～100％），全龄经过短，茧丝纤度1．89～2．22dtex，茧丝长1170m左右，解舒率82％～92％，净度94～96分，生丝相对强力3．62～3．71cN／dtex。适合缫制高品位生丝原料茧的要求。

BREEDING OF A DOMINANT SILKWORM TRIMOLTER SG

The dominant trimolter with stable moltinism but bad economic character and the practical tetramolter with excellent economic Character were used as parents in the study. combining crossbreeding with pedigree selection and breeding to polymerize the excellent genes from parents, in a short peiod trimolter race with excellent synthetical character and stable moltinism was bred and named SG, which was consequently paired with excellent practical tetramolter 54A and 871 resulting in F, that can be used to produce trimolting cocoons with fine size. Further characteristics of the F1 trimolters are as follows: strong and healthy, easy rearing, stable moltinism, trimolter rate 98%~100% 。 short duration of all instars, cocoon size 1. 89~2. 22dtex, cocoon filament length 1170 meters, reelability 82% ~ 92%, non - broken cocoon filament length 900 ~ 1000meters, neatness 94~96 point, tenacity 3. 62~3. 71cN/dtex. All the above characteristics can meet the requirements for reeling high grade silk.