EFFECT OF THE SILKWORM EGG FACTOR ON THE SILKWORM, BOMBYX MORI L. VIABILITY AND PRODUCTIVITY DURING THE AUTUMN REARING SEASON

P. Tzenov, D. Grekov, K. Avramova

Abstract: The effect of silkworm egg factor during the autumn silkworm rearing season on the silkworm viability and productivity was the subject of present study. For the purpose an autumn silkworm rearing of silkworm eggs, produced in the year of experiment by the HCL treatment method were used as a control compared to the eggs produced in the spring of the previous year and wintered had been conducted.It was found that in the autumn silkworm rearing the egg factor had influence on the values of the characters larval period duration, cocoon weight, raw silk percentage, and filament thickness, which were higher in the HCL treated eggs, compared with the wintered. The silkworm egg factor had not influenced significantly the silkworm viability, the rest silk filament technological characters values and the complex traits fresh cocoons and raw silk yield by one box of silkworm eggs.
Considering the results obtained from the present study it is possible to make silkworm autumn rearing by using silkworm eggs, produced in the same year by the HCL treatment method, or if it is necessary, to use eggs produced in the previous year spring and wintered. As regards the silk reeling, the cocoons produced by HCL treated silkworm eggs should be preferred due to their higher raw silk percentage if compared with those from wintered silkworm eggs.

Keywords: autumn; Bombyx mori L.; eggs; HCL; hibernated; rearing; silkworm; treated

Date published: 2018-03-09