COMPARATIVE STUDY OF ROMANIAN AND BULGARIAN SILKWORM HYBRIDS IN ROMANIAN CLIMATE

Alexandra Matei, G. Lenghel, P. Tzenov, Emilia Furdui, M. Doliş, Marilena Constantinescu, Yolanda Vassileva, Gabriela-Maria Cornescu

Abstract
In addition to the breed characteristics and the optimum needed conditions, it is necessary to ensure some efficient hybridizing systems for silkworms. The purpose of our research is to obtain information about the quality of Romanian and Bulgarian commercial hybrids and silkworm egg production intended for export. Eight simple Bombyx mori L. hybrids (four Romanian hybrids S₈ x AC₂₉/T, AC₂₉/T x S₈, AC x B₁ , B₁ x AC and four Bulgarian hybrids V₃₅ x S₂ , B₁ x H₂ , B₁ x S₂ , H₁ x S₂ ) where used as biological material. The characterization of the Bombyx mori L. hybrids was done based on nineteen biological, technological and productive characters. The hybrids are characterized by the following parameters: the larval period 685-730 hours; the weight of the raw cocoon 1,977-2,389 g; the incartment weight 0,372-0,511 g; the filament length 1010-1293 meters; the reeled silk 85,64-89,43%; the fiber fineness 2,1-2,6 d. The following hybrid combinations stand out: AC₂₉/T x S₈ and B₁ x S8 .

Key words: hybrids, Bombyx mori L., larval period, weight raw cocoon, incartment, reeled silk