The study on the original character of special purpose silkworm variety Yuqianhuangjian (Yuqian silkworm with yellow cocoon).

The feeding and egg laying performance of original varieties G101 and Y101 were carried to study their characters for the special purpose silkworm Qianyuhuangjian(Qianyu silkworm with yellow cocoon),and to accumulate the techniques for development.The native original variety with white cocoon Jingsong(Chinese strain),Haoyue(Japanese strain),871(Chinese strain),and 872(Japanese strain) were taken as control,fed with regular method,and the egg laying performance was investigated by egg laying checking method from 10 adult.The results showed that the feeding for original variety G101 and Y101 was easy,the character of variety was stable with high resistance,yield of cocoon was close to regular varieties and the quality of cocoon was high.The score for egg laying from 10 adults was higher,eggs were uniform and flatly attached and with less unfertilized and abnormal eggs,and the quantity of eggs laid was similar to regular varieties,and the number of pieces of papers which eggs laid on for breeding started from 1 gram of newly hatched larva was close or same to regular varieties also.G101 and Y101 is a pair of special characters original varieties which has close cocoon yield and also has golden yellow cocoons.Each of the character of original silkworm Chinese strain G101 and Japanese strain Y101 were close or same to regular varieties.It is applicable since there was very little difference of scores for direct cross and back cross.The combination Qianyuhuangjian already passed the authorization of Guizhou Crop Variety Authorization Committee in December of 2007.