Study on the possibilities for creation of new silkworm, Bombyx mori L. hybrids with high tolerance towards unfavorable larval rearing conditions by crossing sex-limited for larval markings with hardy silkworm breeds

Panomir Tzenov1, Krasimira Avramova2, Dimitar Grekov2
1 Agricultural Academy, Scientific Center on  Sericulture, Vratsa 3000, Bulgaria
2 Agricultural University, Plovdiv 4000, Bulgaria

Abstract

Tzenov, P., Avramova, K. & Grekov, D. (2022). Study on the possibilities for creation of new silkworm, Bombyx mori L. hybrids with high tolerance towards unfavorable larval rearing conditions by crossing sex-limited for larval markings with hardy silkworm breeds. Bulg. J. Agric. Sci., 28 (Supplement 1), 97–100

The present study aimed to investigate the possibilities for creation of new, tolerant to adverse rearing conditions four-way silkworm hybrids by crossing sex-limited for larval markings with hardy silkworm breeds. The main goal expected of the new hybrids would be an easier and more precise egg production, combined with a higher viability and productivity under adverse rearing conditions, which is the common practice at the field level.
By means of crossing between sex-limited for larval markings silkworm breeds and breeds possessing high sturdiness there were created and tested two new silkworm hybrids. In the conditions of a provocative silkworm rearing regime, they showed considerably high silkworm vitality (HB2xNova2 81.17%), which exceeded that of the control (Super 1 х Hesa 2 – 50.50%), having average and high values of cocoon weight and silk shell weight, as well as high silk filament technological character values at the optimal rearing conditions.

Keywords: silkworm; Bombyx mori L; sex-limited breeds; crossing; sturdiness

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