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KMID : 1041219670070010049
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Journal of Sericultural and Entomological Science
1967 Volume.7 No. 1 p.49 ~ p.52
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Different Ratio between Male and Female in F, Hybrids and Parents of Silkworm; Bombyx mori. L
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Hong Ki-Won
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Abstract
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In the F hybrids and parents of silkworms, the silkworms of 47 blocks in summer and 68 blocks in fall in 1965 were reared in order to know the effect of mortality on the difference of sex ratio. The results analyzed are as follows; 1. In Moran of Japanese strain-parent and Morean x Daedong of F hybrid, there is of no effect of an increase and decrease of mortality on the sex ratio. So male is not always stronger than female. 2. In Daedong of Chinese strain-parent, the more the mortality in the blocks is, the higher the survival ratio of male pupa becomes. (Y=0.233x-41.67). 3. As the results mentioned above, the present investigation method of cocoon quality of Chinese strains with the same number of cocoons of both sexes will have to be considered again, according to the cocoon crops, as far as concerned with the reasonable sampling from the population.
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KEYWORD
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