Study of the Reaction of Silkworm Hybrid and Line Varieties against Individual Selection in Spring and Autumn Seasons

摘要

In this program, existed data in Iran silkworm research center related to individual selection system was used. For data collection and data recording, researchers used standard forms of economical recording in silkworm and Excel Software and for statistical analysis we used Generalized Linear Models (GLM) of SAS Software. Data was recorded in Excel Software and analyzed with SAS Software and for comparing the average, Student t-test was used. In this study, 27 traits in 12 varieties including six lines and six hybrids in two Spring and Autumn were studied. Study results showed that selection increases the performance in silkworm varieties. The selection effect varied in different seasons. In all varieties in Autumn, pupae vitality percentage in middle cocoon, middle produced cocoon number, middle cocoon percentage, larvae duration and unfertilized larvae number were significantly increased (p<0.05). In all varieties in Spring, alive larvae number, alive pupae number, produced cocoon number, best produced cocoon number, middle produced cocoon number, total best cocoon weight, single best cocoon weight and hatched larvae number responded to selection and showed significant increase (p<0.05).