Interrelationships Between Some Quantitative Characters in Different Lines of Silkworm (Bombyx mori)


Abstract: This research was conducted to find out the characteristics related with cocoon and egg yield and correlaitions between these important characters in B8 (Japan) and Tokai (Chinese) breeds of silkworm. The relation between mounting weight and cocoon yield traits and the possibility of using them in selection were also investigated. The silkworms of the B8 line proved to be superior to Tokai with regard to mounting weight and pupal weight traits (P<0.05). In addition, both lines were found to be similar with respect to cocoon weight, cocoon shell ratio and moth weight. The female silkworm of both lines had higher values with regard to those characters than the males (P<0.01). The high correlations between mounting weight of larvae with shell weight, pupal and moth weight; shell weight with shell ratio were significant in both sexes of the two lines (P<0.01). B8 line was superior to Tokai with regard to egg yield. The correlations between egg number and pupal weight were significant in both sexes (P<0.05).

Keywords: Silkworm (Bombyx Mori L.), Mounting Weight, Cocoon Shell Weight, Pupal Weight, Correlations

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