若干家蚕品种的复壮及比较试验

对浙江省夏秋蚕品种薪杭，白云，丰1和54A等进行了充血复壮改良，基本稳定后的复壮系与现行生产系进行了生产性能的比较试验。结果表明复壮系在各项性状都有一定的提高，其中龄期经过，各品种的复壮系与生产系之间差别不大，只有薪杭丙和白云丙稍有延长。全茧量和茧层量基本上复壮系都比生产系有所提高。生命率差异比较大，奠中薪杭的复壮系低下生产系，差异达到显著水平，白云复壮系略微低于白云甲，但高于白云乙，丰1的复壮系与生产系无明显差异，54A则是复壮系高于生产系。良卵数除薪杭丙比薪杭甲略低外，其他品种的复壮系都比生产系显著提高，有的甚至达到极显著水平。说明复壮系在生产性能上有较大的改良，有一定的推广应用价值。

Rejuvenation of Four Commercial Varieties of Silkworm,Bombyx mori and the Comparison Experiment

Four commercial silkworm races,Fengyi,Xinhang,Baiyun and 54A,were rejuvenated and compared with the present commercial lines.Results showed that almost all the productivity traits were improved.Larval duration was a little longer in the rejuvenated lines of Xinhang and Baiyun.While the survival rate of the rejuvenated Xinhang was decreased significantly,the rejuvenated line of 54A was higher compared with the commercial line and there was no significant difference shown in Fengyi.The cocoon weight and cocoon shell weight of the rejuvenated lines were all improved in this breeding plan.The number of good eggs of rejuvenated lines was also improved except Xinhang.This research showed that the productivity traits of the rejuvenated lines were better than the commercial line and suggested to be used for commercial production.