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一、问題的提出与经过优良蚕种必須具备絲量多、絲质好、抗逆性强、龄期短、发育整齐、飽养容易、茧形匀整、茧色洁白等性状。目前我省农村大面积生产的春用种是沄汗×华九(正反交)一代杂种,这个品种产茧量比較稳定,但缺点是出絲率較低、茧絲纖度較粗、丝質不够理想,而且单位用桑量又多。1958年起,花了三年时間,試图換用中国农业科学院蚕业研究所培育的鎮_1×鎮_2、鎮_5×鎮_8(及其反交)、苏_(16)×苏_(17)等一代杂种,这些品种虽然茧层率高,但产茧量不及沄汗×华九(正反交),同时对我省各地的自然条件适应性不强,飼养技术要求又高,在农民一般技术飼养条件下,优良特性不能充分发揮,产量是不稳定的。因此,从当前大面积生产水平出发,选育出优于現有品种、适于本省自然条件和农村一般技术水平的新品种,是蚕业研究的重
First, the question put forward and after the excellent silkworm eggs must have more silk, good silk, strong resistance, short age, well-groomed, well-fed, cocoon-shaped uniform, cocoon color white and other traits. At present, the spring planting for large area production in rural areas in our province is a hybrid of F1 generation of crossbreed × Huajiu (crossbred). The cocoon yield of this variety is relatively stable, but the disadvantage is that the output of silk is low, Not ideal, and the unit with Mulberry more. It took three years from 1958 onwards to try to switch to the towns cultivated by the Institute of Sericulture, Chinese Academy of Agricultural Sciences, _1 × town_2, _5 × town town _8 (and its anti-crossing), Su _ (16 ) × Su _ (17) and other hybrids. Although these varieties had high cocoon shell rate, their cocoon production was less than that of Xijian × Huajiu (reciprocal cross), and their adaptability to the natural conditions of the province was not so good. High technical requirements, farmers in the general breeding conditions, the excellent features can not give full play, the output is not stable. Therefore, from the current large-scale production level, bred better than the existing varieties, suitable for the province’s natural conditions and the general technical level of rural new varieties of sericulture research is the weight