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一、品种由来桑蚕新品种“137×秋303”及“137×403”是适合我省3-6造高温多湿季节饲养的多化性一代杂交种。具有担桑产茧量高,出丝率较高,丝的品质较好等特点。这两个杂交种从1973年第一造开始选育,至1975年第六造,“137”已选育至F18,“403”已选育至F20,“秋303”已选育至F18,三个原种的各项性状已基本稳定。“137”是由两个有滞育期的多化性品种“613”和“107”杂交选育而成,为形蚕,茧形椭圆,“137”和“九白海”对比,具有起眠齐一,熟蚕齐一,龄期经过短(蚕期比“九白海”短半天左右),茧层率较高(17％左右,比“九白海”提高20％),体型小,
First, the origin of varieties New varieties of silkworms “137 × autumn 303” and “137 × 403” is suitable for our province 3-6 to create high temperature and humidity season breeding multiple generation hybrids. With the high production of cocoon cocoon, a higher rate of silk, silk, and other characteristics of good quality. The two hybrids were bred from the first plantation in 1973 to the sixth plantation in 1975, “137” had been bred to F18, “403” had been bred to F20, “Qiu 303” had been bred to F18, The three species of the traits have been basically stable. “137” is a result of two diapause variety “613” and “107” hybrid breeding, shaped silkworm, cocoon-shaped oval, “137” and “JiuBaihai contrast, with a In the same period, the mature silkworm is one, the age is short (the silkworm period is about half a day shorter than ”Jiu Baihai"), and the cocoon shell rate is higher (about 17%, 20% higher than that of the Jiu Baihai) ,