春秋兼用家蚕品种川蚕23号的选育

Breeding of a New Silkworm Variety "Chuancan 23"for Spring and Autumn Rearing

采用杂交选育和定向选择的育种方法,育成了优质、高效、好养的春秋兼用家蚕新品种川蚕23号。经四川省家蚕品种实验室鉴定和农村生产试养表明,新品种具有体质强健、耐高温多湿、龄期经过短、饲料效率高、茧丝品质优良、产量稳定的特点,已通过四川省家蚕品种审定委员会审定。新品种春季在农村试养鉴定的100 kg桑收茧量9.11 kg,比对照品种871×872提高8.58%;在实验室鉴定的成绩与对照品种菁松×皓月相当,虫蛹率96.20%,解舒率79.86%,鲜茧出丝率17.72%,洁净97.91分。新品种秋季在农村试养鉴定的100 kg桑收茧量7.54 kg,比对照品种洞.庭×碧.波提高3.98%;在实验室鉴定的虫蛹率93.05%,万蚕产茧量18.77 kg,分别比对照品种洞.庭×碧.波提高1.74个百分点、2.46%,一粒茧丝长1 150 m,解舒丝长932 m,解舒率81.04%,洁净94.82分,鲜茧出丝率16.90%,分别比对照品种洞.庭×碧.波提高41 m、83 m、4.50个百分点、3.06分、0.38个百分点。新品种在饲养条件和气候环境较差的蚕区饲养,能显示出良好的生产性能。

A new silkworm variety＂Chuancan 23＂for spring and autumn rearing with characters of excellent quality,easy rearing and high efficiency was bred by means of hybridization and directional selection.The results of laboratory identifi-cation and rural production trials in Sichuan Province showed that larvae of the new variety had high vitality,strong endur-ance to high temperature and humidity,short duration of instars,high forage efficiency,excellent silk quality,and stable cocoon yield.It has passed the evaluation of Sichuan Provincial Silkworm Variety Evaluation Committee.Rural production trials in spring showed that its cocoon production per 100 kg mulberry leaf was 8.58% higher than that of the control vari-ety 871 × 872.The results of laboratory identification in spring showed that its larva-pupa rate was 96.20%,reelability was 79.86%,raw silk rate of fresh cocoon was 17.72%,and neatness was 97.91 points,being close to those of the control variety Jingsong × Haoyue.Rural production trials in autumn showed that its cocoon production per 100 kg mul-berry leaf was 3.98% higher than that of the control variety Dong.Ting × B.iBo.The results of laboratory identification in autumn showed that its larva-pupa rate was 93.05%,cocoon weight per 10 000 larvae was 18.77 kg,single cocoon fila-ment length was 1 150 m,reelability was 81.04%,neatness was 94.82 points,and raw silk rate of fresh cocoon was 16.90%,being 1.74 percentage points,2.46%,41 m,83 m,4.50 percentage points,3.06 points,and 0.38 percentage points higher than that of the control variety Dong.Ting × Bi·Bo respectively.It is concluded that the new silkworm variety could exhibit favorable production features in silkworm raising areas with relatively poor environmental and climatic conditions.