论文部分内容阅读
用杂交群体对亲本回交法估计桑蚕几项性状的狭义遗传力表明,遗传力的大小因性状而异,茧层率、茧丝量及茧丝长有较高的遗传力,而全茧量及茧层量的遗传力较低。 选择试验表明,桑蚕各性状之间有高度的相关性,对某一性状的直接选择亦等于对另一些性状的间接选择。选育夏秋用蚕品种,应将茧层率控制在一定的范围内,向经过短、全茧量偏小的方向选择比较妥当;春用蚕品种的选育应控制全茧量,在提高茧层率的同时,大力向经过短的方向选择为宜。
The narrow heritability of the silkworm population estimated by backcrossing hybrids showed that the heritability varies greatly with different traits. The cocoon shell rate, cocoon silk quantity and cocoon length have higher heritability, The heritability of amount and cocoon layer is low. Selection experiments showed that the silkworm has a high correlation between the traits, the direct selection of a trait is equal to indirect selection of other traits. Breeding summer and autumn silkworm varieties, the rate of cocoon shell should be controlled within a certain range, to the short, the whole cocoon amount of the direction of choice is more appropriate; selection of spring silkworm varieties should control the amount of whole cocoon, improve the cocoon Layer rate at the same time, vigorously to short direction through the appropriate choice.