NGHIÊN CỨU ĐẶC ĐIỂM SINH HỌC, KINH TẾ VÀ ƯU THẾ LAI CỦA MỘT SỐ GIỐNG TẰM ĐA HỆ NGUYÊN

Identifying of the correct parental material is very important in the breeding work of silkworm. In this paper, we analyzed economic and biological characteristics and heterosis of parent multivoltine silkworm races. The results showed that varieties HLS, RVTB and RVHT had high stabillity in different seasons. The economic traits of Jn race was very high (received cocoon weight 392g), but the indicator of vitality worm (84,95%) was lower than the local varieties. The coordinate of ability between Jn and HLS, RVHT, RVTB, VDK were pretty good which expressed in hybrid hererosis of received cocoon weight (20,30 - 39,44%), whole cocoon weight (11,72%-22,35%) and cocoon shell weight (4,17 - 25,96%). The hybrids of the local varieties (ĐSK, VBL, TM) did not have heterosis or it was very low. In different seasons, heterosis was different.