桑蚕春用品种贵蚕2号的选育

Breeding of the Spring Rearing Silkworm Variety GuiCan No. 2

采用双测交育种方法，育成了强健优质春用蚕品种贵蚕二号（827·渝5×826·渝3），系四元杂交种。经多次鉴定、农村饲养、试繁结果表明：该品种体质强健好养，制种性能好，茧大而匀，茧丝质良好，综合经济性状优良，四龄万蚕收茧量23．03kg，四龄万蚕茧层量5．86kg，茧成率25．43％，茧丝长1446m，解舒丝长1253m，鲜毛茧出丝率19．93％，净度96．88分。适宜贵州省春季用种．

Double cross test of improving health and silk quality of spring rearing silkworm varieties, by using themethod of hybridisation, we have bred a new silkworm varisety Gui Can No. 2(827·Yu5×826·Yu3). Based onthe identification in laboratory and countrysids, the results obtained from the silkworm egg producing statious, It isunderstood that: Silkworms of the new varitiey are strong and healthy, satistactory property for seed production Itmakes big cocoons, has excelent cocoon and silk quality. It is comprehensive economical characters are good. thetetre hybrid yielded 23.04kgcocoons and 5. 86kg cocoon shells from 10 000 larvae of 4th age, it is cocoon shell ratiois 25. 43%, cocoon filament length is 1446m, non-breaking filament length is 1253m, ram silk ratio of freshcocoonis 19.93% neatness is 96.88 marks, As a spring rearing silkworm Variety, it is favorable for Guizhou Province aswell.