Breeding ofompleteSex-limitedMarkingSilkworm VarietyDong· Ting X Bi· Bo for summer—autumn Rearing

 
  GUO DinggUO WU Zheng Zhong Jln YOngnin Xiang Sheng gang Xiao Jian Zhong
    (The Sericultural Research Institute of Hunan Province,Lixian 415500)
  Abstract Through selection and breeding by employing hybridization,backcrossing,intervening crossing pedigree selection,two summer- autumn sex—limited marking silkworm races,namely Dong(Xian1B)and Bi(Xian2A),of high quality were bred.A tetra hybrid Dong·. Ting×Bi.Bo is combined when the Dong and Bi was Paired with Introduced sexlimited races Ting(QiufengB)and Bo(854B).The results of laboratory ldentification,countryside rearing test and multiplication in silkworm eggs farm showed that it is a strong,healthy and easy to rear variety with uniform cocoon,good filament properties,easy rearing for parent silkworm,high propagation coefficient,complete ses-limited marking and favorable comprehensive ecolomic characters.
    Key wordS  Bombyx moriy Complete sex-limlted marking variety Dong.· Ting Bi.Bo
 
                                    (原载《蚕业科学》2001年第1期,略有增删)