CreatION OF sex – limited for cocoon color silkworm bombyx mori l. breeds
Keywords:
silkworm, sex-limited breeds, biological characters, technological characters, cocoon, colorAbstract
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.
References
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