RESULTS SELECTED OF THE DOUBLE CROSS SUITABLE FOR SILKWORM BREEDRAISING IN THE SOUTH - CENTRAL COAST

Abstract

In order to create the bivoltine silkworm breed adapting to the climatic conditions of the South - Central Coast region. The research used 11 pairs of bivoltine double crosses that have good resistance with the hot - wet, hot - dry condition and resistance with virus BmNPV to select. The result has selected 2 best crosses recommending to production test, which have: Silkworm vitality 90.18 - 90.67%, pupa vitality 94.01 - 95.81%, cocoon productivity/300 4 - year silkworm achieve 380 - 384 g greater than the control (LQ2) with corresponding indexes of (86%; 81.77%; 362 g). About cocoon quality, the cocoon shell ratio of 21.82 - 22.05%, single silk length of 841 - 914 m, silk ratio of 15.63 - 15.78% and cocoon consumption coefficient/kg of silk 6.34 - 6.40 kg equivalent to the control (LQ2) breed with corresponding indexes of (21.86%; 798 m; 15.84%; 6.31 kg).