Journal of Food, Agriculture and Environment

Phenotypic changes and difference of phenotypic and genetic values of economic characters in silkworm Bombyx mori L.

Author(s):

S. Z. Mirhosseini ¹, A. R. Seidavi ^2*, M. Mavvajpour ³, M. Ghanipoor ³, A. R. Bizhannia ³, A. A. Qotbi ², M. Chamani ⁴

Recieved Date: 2009-12-07, Accepted Date: 2010-04-10

Abstract:

The present study reviews phenotypic changes and the differences of phenotypic and genetic values of economical traits including cocoon weight, cocoon shell weight and cocoon shell percentage under individual selection based on cocoon weight. Six pure lines were reared in two, selected and control, groups during four generations. Individual selection was done only in the base population. All mates were conducted randomly in next generations and economic traits were recorded. Phenotype improvement was through differences between phenotypic mean value of the individuals in base population in two selected and non-selected groups. Phenotypic response rate was significantly different in studied pure lines (P<0.01). Amounts of cocoon weight response were high in pure lines of 104 (0.443 g) and 103 (0.395 g) due to high heritabilities of these pure lines. Correlated response to selection for cocoon shell weight was positive. Amounts of cocoon shell weight response were high in pure lines of 104 (0.101 g) and 103 (0.098 g). Correlated response to selection for cocoon shell percentage was negative in pure lines 107 (-1.123%), 32 (-0.595%) and 104 (-0.068%). Differences between P₂-P₁ and g₂-g₁ decreased in latest generations and the phenotype presented better estimation of genetic potential. The correlation coefficient between P₂-P₁ and g₂-g₁ for cocoon weight, cocoon shell weight and cocoon shell percentage were 0.696, 0.94 and 0.90, respectively. This indicates there was higher prediction accuracy for cocoon weight and cocoon shell weight due to their high heritabilities and lower prediction accuracy for cocoon shell percentage due to its high heritability.

Keywords:

Insect, genetics, phenotypic value, improvement, cocoon

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 1005-1009

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