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KMID : 1041219890310020091
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Journal of Sericultural and Entomological Science
1989 Volume.31 No. 2 p.91 ~ p.101
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Heritability, Genetic Correlation and Path Coefficient Analysis of Economic Characters in the Silkworm, Bombyx mori
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Abstract
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This experiment was carried out to analyze genetic parameters for the selection of silkworm by diallel-crossing with three Japanese and four Chinese silkworm races.
Heritability, genetic correlation and path coefficient were calculated as the statistical parameters to evaluate direct or indirect effects of various gentic characters on bave weight. The heritabilities of fifth instar period, cocoon weight, cocoon layer weight, cocon layer ratio, fibroin contents, boiling off ratio and bave weight were over 76.65% in both F1 and F2 generations.
There were positive coefficients in both phenotypic and genotypic correlations between male and female of both F1 and F2 generations. The latter showed greater values in general. The correlation between bave weight and the characters of cocoon weight, cocoon layer weight,cocoon layer ratio, fibroin contents were over 0.727 in both sexes of F1 and F2. Therefore, these results suggest that above characters would be useful for genetic selection of silkworms. As result of path coefficient analysis, there was a direct effect with path coefficient value of 0.991 between bave weight and F1 female cocoon layer weight, and with the value of 0.803 between bave weight and F1 male cocoon weight. In F2, the effect showed 0,938 between bave weight and male cocoon layer ratio, and 0.930 between bave weight and male fibroin contents.
The characters of cocoon weight and cocoon layer weight had greater influence on direct or indirect effects (in path coefficient) than the others.
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