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Development of High Yielding Silkworm Races: I. Breeding of BSRI-85 Series.

T. Haque
Senior Research Officer
Bangladesh Sericulture Research and Training Institute (BSRTI), Rajshahi.

S.M. Rahman
Department of Zoology, Rajshahi University.

Abstract/ Executive Summary:

To develop a set of good multivoltine breeds of silkworms five inbred races viz.; Nistari(M), Nistari (P), BSR-3, M2P2 , BSRI-801 and one exotic Bivoltine race BV (J) were utilized for this experiment. After crossing F1 females were back crossed with the male of exotic parent. Three promising lines (viz.; RBE-2B, RBE-5B and RBE-3C) were finally selected and isolated after inbreeding through 12 generation. The evolved races were subjected to field trial experiment at 6 (six) different extension areas and found to be superior over Nistari in all respect, specially yield and silk ratio percentage. On the basis of field trial results the evolved races (viz. BSRI-85/1; BSRI-85/3 respectively) were recommended for commercial exploitation to intensify raw silk productivity.

Keywords: Breeding of BSRI-85 Series, silkworm races,

Location: Bangladesh Sericulture Research and Training Institute ( BSRTI)

Start Date: 00-00-1982

End Date: 00-00-1984

Program Area: Resource Development and Management

Commodity: Silkworm

Objectives:

To replace the existing commercial silkworm races for development of still better multivoltine races with better productivity and resistancy.

Methodology:

Five inbreed indigenous races namely Nistari (M), Nistari (P), M2P2, BSR-3, BSRI-801 and one exotic bivoltine race BV (J), were selected for this experiment. Tech experiment was conducted at the Bangladesh Sericulture Research and Training Institute, Rajshahi during the years 1982-1984. Only females of indigenous races were crossed with the males of the bivoltine race. The five lines thus obtained from these crosses were named as RBE-1, 2,3,4 and 5. Upto F4 generation the lines were maintained under cellular rearing so as t secure maximum combination effect. In F4 generation three sub lines from each combination were isolated based on the shape size and colour of the cocoons and were maintained in the F5 generation which ere subjected to further selection pressure from F6 to F12 generation. Finally three lines were fixed in F15 generation. Sufficient diseases free laying were prepared from the selected lines throughout the experiment. Only those laying good number of eggs and high hatching percentage were finally brushed. Rearing procedure recommended by Krishnaswami (1979) were strictly followed. The selection pressure was stressed on the following characters. 1. Total number of eggs per layng (350-400 number) 2. Percentage of hatching (above 90%) 3. Weight of 10 mature larvae (above 30 g) 4. Effective rate of rearing by number and by weight (7500 nos and above 10 kg respectively). 5. Cocoon weight and shell weight (1.20 g and above 0.20 g respectively) 6. Length of single filament (above 600 mtrs) 7. Shape of the cocoons (compact with less floss). 8. Shape of the cocoons (oval with slight constriction). 9. Colour (deep yellow)

Source of Information: Bulletin of Sericulture Research. 1990 Vol.1:51-60 published by Bangladesh Sericulture Research and Training Institute.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The performance of the evolved breeds has been better leading to increase in cocoon production.

Knowledge Management: Journal