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 characteriatics 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 with the Bulgarian hybrid Super 1 x Hesa 2 as a control and their suitability for field rearing respectively. The 4 new created silkworm hybrids were characterized with larvae having black color 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) -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 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 a medium productivity, while the hybrid (Super 1 x Hesa 2) x RG 90 has comparatively high productivity.

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

Date published: 2023-02-02