CREATION OF SEX - LIMITED FOR CACOON COLOR SILKWORM BOMBYX MORI L. BREED

P. Tzenov, J. Vasileva, D. Arkova-Pantaleeva

Abstract: During the period of 2010-2012, in Sericulture and Agriculture Experiment Station (SAES), Vratsa, a scientific research directed to creating silkworm populations and breeds that are limited for cocoon color has been conducted. The research has been carried out with the Japanese breed D 50 – sex-limited for cocoon color, the newly selected and limited for cocoon color breeding populations Lim 1 and Lea 2, and Super 1 and Hesa 2 breeds. A backcrossing of females from Lim 1 and Lea 2 populations with selected mails from the Super 1 and Hesa 2 strains respectively was performed. In some of generations inbreeding of the type brother x sister was implemented. The D 50 breed was reared as control initial population. For the first time in Bulgaria two new, sex-limited for cocoon color silkworm breeds which were closer to the main productive characters values of the standard strains – improvers and performed higher productivity than the most silkworm strains, included in the germplasm resources, maintained at SAES - Vratsa were created. We recommend in the future to continue the new sex-limited for cocoon color breeds Lim 1 and Lea 2 maintenance crossing of their female individuals with males from the breeds Super 1 and Hesa 2 respectively.

Keywords: biological characters; cocoon; color; sex-limited breeds; silkworm; technological characters

Date published: 2017-05-09