| Abstrakt: |
In Bulgaria the silkworm cocoon is bred mainly in the spring–summer /May and June/ and the summer-autumn /August and September/ seasons. It is often put under the influence of some stress factors, such as the high temperature. The negative influence of the stressfactors on the silkworm cоcoon and the mulberry could be partially, or even fully, compensated by the breeding and cultivation of silkworm races and hybrids and mulberry varieties, tolerant to stress factors with the application of appropriate technologies. The study was conducted with Bulgarian-Indian breeds and hybrids, hybrid populations were bred between highly productive Bulgarian breeds and Indian polyvoltine breeds C. Nichi and Pure Mysore. The tested breeds and hybrids were bred in two modes: under optimal conditions and in a provocative breeding regime, examining the indicators of vitality, cocoon weight and silkworm weight. The beetles were raised in May. The aim of this study was to assess the extent of adaptability of some Bulgarian and Bulgarian-Indian breeds and hybrids of mulberry silk. Data on the vitality and some productive qualities of the beetles were collected. From the tests we can say that all newly created hybrids between Bulgarian and Indian buffalo breeds show relatively high vitality in a provocative breeding regime.Hybrids with high viability of beetles under provocative regime and relatively high productivity under optimal growing conditions are HB2 x BB1, Iva1 x BB1, Nova2 x HB2, HB2 x Nova2, Korea2 x HB2, HB2xKorea2, CSR4 x BB1, Gen3xHB2. [ABSTRACT FROM AUTHOR] |
