A STUDY ON NEWLY CREATED SILKWORM, BOMBYX MORI L., HYBRIDS CHARACTERIZED WITH SOME SPECIAL QUALITATIVE CHARACTERISTICS

Panomir Tzenov, Jolanda Vasileva, Diana Pantaleeva, Alexandra Matei, Dimitar Grekov

Abstract: Four new F1 silkworm hybrids characterized with some special qualitative characteristics of the larvae and cocoons were created during the period 2007 - 2009 at the Sericulture and Agriculture Experiment Station, Vratza. The study conducted aimed at determining the main productive characteristics values in the new hybrids, using the Bulgarian hybrid Super 1 x Hesa 2 as a control, and their suitability for field rearing respectively. The created 4 new silkworm hybrids are characterized with larvae having black colour and yellow cocoons /(Super 1 x Hesa 2) x Ps/, larvae with zebra markings and golden-yellow cocoons /(Super 1 x Hesa 2) x RG 90/, pink color cocoons /(Super 1 x Hesa 2) х Е-27/ and green cocoon color /(Super 1 x Hesa 2) x China/. The new hybrids demonstrated lower larval survivability and cocoon and silk productivity than those of the control, the hybrid Super 1 x Hesa 2, and they were characterized by medium values of the productive traits, while the hybrid (Super 1 x Hesa 2) x RG 90 - with comparatively high values. The new silkworm hybrids could be used for rearing at the field level because they possess medium productivity, while the hybrid (Super 1 x Hesa 2) x RG 90 has comparatively high productivity.

Keywords: Bombyx mori L.; characters; hybrids; productivity; qualitative; silkworm

Date published: 2023-02-03