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Effect of Feeding Frequency on the Rearing Performance of Local, Improved and Bivoltine Races of Silkworm, Bombyx Mori L.

K T Haque
BSRTI, Rajshahi

T Haque
BSRTI, Rajshahi

A C Barman
BSRTI, Rajshahi

S Islam
BSRTI, Rajshahi

Abstract/ Executive Summary:

The effect of feeding frequency in the rearing of different mulberry silkworm races in four different commercial rearing seasons of Bangladesh were studied. Two times feeding/day significantly affected the rearing performance of all the silkworm races in all season. Four times feeding/day showed best results in all rearing seasons except in Bhaduri when times feeding/day exhibited better result.

Keywords: Silkworm, Effect of feeding Rearing

Location: Bangladesh Sericulture Research and Training Institute

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Silkworm

Objectives:

To determine the actual effect of varying number of feeding given in 24 hrs on the rearing performance of different commercial cocoon crops in Bangladesh.

Methodology:

Three silkworm races viz., MBY-011S (P) (Local) BSR1-85/2 (improved multivoltine ) and Ziangsul2 (P) (Bivoltine) were used for this investigation. The eggs were incubated until hatching and brushed larvae reared in mass beds on fresh mulberry leaves during 1st and 2nd instar to develop a required number of larvae for this study. The rearing was conducted following methodes of Krishnaswarni (1978). Third instar larvae were counted and distributed in different groups, each consisted of 300 larvae in 90cm x 60cm wooden trays with three replications. The larvae of each group were fed 2 times (TJ, 3 times (T2) and 4 times (TJ, at 12hrs. 8 and 6 hrs. intervals respectively. The experiment was conducted in four cocoon growing seasons; Agrahyoni (S,), Chaita (S2), Jaistha (S3) and Bhaduri (S4) during 1990-91. Observations on larval duration (LD), larval weight (LW), larval mortality (LM), effective rate of rearing (E.R.R), cocoon weight (CW), shell wieght (SW), shell% and length of filament (LF)were carefully recorded for each groups and replications and analysed statistically.

Source of Information: Bulletin of Sericulture Research 1995 vol6:07-11 Published by Bangladesh Sericulture Research and Training Institute.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Three(3) times feeding in Bhaduri was found ideal for higher cocoon harvest. Chinese workers (Anon 1984) reported that decrease number of feeding /day exhibited better crop harvest in humid condition which are in conformity with this findings. Therefore, it is recommended that under Bangladeshi weather 4 times feeding/day may be practiced for commercial rearing in Agrahyoni (S,), Chaita (SJ and Jaistha (S3) while 3 times feeding/day may be practiced in Bhaduri (SJ season for better cocoon production.

Knowledge Management: Journal