Selection strategies considering varietal differences with respect to egg characters of mulberry silkworm, Bombyx mori L.

University Journal of Zoology, Rajshahi University Pub Date : 2013-06-18 DOI:10.3329/UJZRU.V31I0.15375

M. Ahsan

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Abstract

The genotypic variability and correlation coefficients were studied in 27 indigenous multivoltine varieties of mulberry silkworm, B. mori L. for six egg characters. The genotype was highly significant for all the characters under studied. Least difference between genotypic and phenotypic coefficient of variation were observed. Majority of the characters showed high heritability comparing with dead egg percentage. Furthermore Unfertilized egg percentage showed high genetic advance together with high heritability but HP and EW showed high heritability and low genetic advance. These indicate the importance of additive and non-additive gene effect of these characters respectively. Total number of egg laid by female, hatching percentage, and blue egg percentage showed both positive and negative significant correlation to each other at both the phenotypic and genotypic levels. The results suggest that these characters specially total number of egg laid by female, blue egg percentage and unfertilized egg percentage appeared as importance in selection programme for genetic gain in B. mori. DOI: http://dx.doi.org/10.3329/ujzru.v31i0.15375 Univ. j. zool. Rajshahi Univ. Vol. 31, 2012 pp. 19-22

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考虑桑蚕卵性状品种差异的选择策略。

对27个乡土多期桑蚕品种6个卵性状的基因型变异和相关系数进行了研究。所有性状的基因型均极显著。基因型变异系数与表型变异系数差异最小。与死蛋率相比，大部分性状表现出较高的遗传力。未受精卵率表现出高遗传推进力和高遗传力，HP和EW表现出高遗传推进力和低遗传推进力。这分别说明了这些性状的加性和非加性基因效应的重要性。雌性产卵总数、孵化率和蓝蛋率在表型和基因型水平上均呈显著正相关和显著负相关。结果表明，雌卵总数、蓝卵率和未受精卵率在家蚕遗传增益的选择程序中起重要作用。DOI: http://dx.doi.org/10.3329/ujzru.v31i0.15375 Univ. j. zool。Rajshahi university . Vol. 31, 2012 . pp. 19-22

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University Journal of Zoology, Rajshahi University

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