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Genetic Variation of Some Quantitative Traits in Ten Exotic Varieties of Silkworm, Bombyx Mori L.

M. K. Ahsan
Sericulture Research Laboratory Department of Zoology, University of Rajshahi, Rajshahi-620S, Bangladesh.

S. M. Rahman
Sericulture Research Laboratory, Department of Zoology, University of Rajshahi, Rajshahi-620S, Bangladesh.

Abstract/ Executive Summary:

An investigation was conducted with ten exotic varieties of silkworm, Bombyx mori L. to estimate variability, heritability and genetic advance for nine quantitative characters. A wide range of variation was observed for the majority of the traits and a major portion of the total phenotypic variation was of genetic in nature. A moderate to high heritability was recorded for these races. Filament length showed the highest heritability. A comparatively high heritability accompanied by a high genetic advance were also noted for majority of the traits. Substantial variability, high heritability and high genetic advance for filament length, weight of mature larvae, total number of eggs laid per female and effective rate of rearing by weight recorded in this study would afford scope for effective selection.

Keywords: Genetic variation, Quantitative, Traits, Exotic, Silkworm, Bombyx Mori L.

Location: Sericulture Research and Training Institute, Rajshahi

Start Date: 01-01-2002

End Date: 31-12-2002

Program Area: Crop-Soil-Water Management

Commodity: Silkworm

Objectives:

To study the genetic variability among ten exotic stocks available in Bangladesh.

Methodology:

Ten exotic varieties of silkworm, B. mori namely L. Dong-34(M), Ziangsu-12(J), RB-001, RB-112, Bivoltine-l, NB₇NB₁₈NB₄D₄SK₁and SK₂ selected from Bangladesh Sericulture Research and Training Institute, Rajshahi constituted the base material of this experiment. Rearing of these silkworms were conducted following standard rearing techniques. Disease free layings (dfls) from each breed were reared on rearing trays in a randomized block design with three replications. Nine quantitative characters such as total number of eggs laid per female (TEL), hatching percentage (HP), weight of mature larvae (LW). effective rate of rearing by number (ERRn), effective rate of rearing by weight 56 Ahsan et. al. (ERRw), cocoon weight (CW), shell weight (SW), filament length (FL) and estimated cocoon yield per 100 dfls (ECY) were collected from each replication for statistical analysis. Genotypic (82g) and phenotypic (82p) variations were estimated by the formula given by Burton and De Vane (1953) and the coefficient of variability was worked out as described by Burton (1952).

Source of Information: Bangladesh Journal of Agriculture, Vol. 27 & 28, pp. 55-58, 2002 & 2003, ISSN- 0253-5408, Bangladesh Agricultural Research Council.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In this results FL, LW and TEL showed comparatively high coefficient of variability, heritability, as well as genetic advance and genetic advance as percentage of mean indicates that a wide range of genetic diversity existed which could be used in a breeding programme. It also indicated the importance of additive gene effects in these characters and phenotypic selection of these characters would be effective (Panse, 1957; Rahman and Rahman, 1990; Reza et al. 1993). A number of character showed high heritability but low genetic advance. This might happen due to the intra or interallelic interaction. In such situation recurrent selection may be adopted to these traits (Pershad et at. 1986, Rahman and Rahman, 1990).

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