家蚕母种继代蛾区选择方法对种性维持的影响

Effect of Selection Method for Succession of Great Grandparent Silkworm on Maintenance of Characteristics

为了有效保持生产实用家蚕品种的优良性状，在家蚕母种继代繁育中采用5种选择方法选择继代蛾区，探讨种性维持效果。分析8年12代及F1代的成绩表明：所有性状以保持种性为主，采用选留平均数上下1个标准差范围内蛾区的稳定化选择和以茧丝质指标在平均数-0．5～1．0标准差范围内选择，并结合健康性指标选留高值的综合选择，有利于家蚕母种的种性维持。

For maintenance of the good traits of practical varieties, five different methods for succession of great grandparent silkworm were applied and compared. The results from analysis of 12 generations of 8 years and F1 revealed that methods of selecting traits ranging from -1.0 to 1.0 standard deviation focused on the stabilization, and of comprehensive selecting cocoon and silk traits ranging from -0.5 to 1.0 standard deviation combined with the best viability were better than the other three ones for maintaining characteristics of great grandparent silkworms.