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Correlation Analysis Between Yield and Yield Contributing Characters of Eighteen Races of Silkworm

D Afrin*
Department of Animal and Fish Biotechnology, Sylhet Agricultural University, Sylhet-3100, Bangladesh

L Arbia
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh

R F Rahman
Research Officer, Bangladesh Sericulture Research and Training Institute (BSRTI), Rajshahi-6205, Bangladesh

A K Roy
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh

Abstract/ Executive Summary:

The investigation was conducted to evaluate the performances of rearing of eighteen races of silkworm, BombyxmoriL. Characters viz., weight of mature larva, number of cocoon kg^-1, yield 100 dfls^-¹ (disease free layings), cocoon weight, length of filament were evaluated in a single rearing season. Performances of the race BSR-BN (B1) were reasonably good for no. of cocoon kg^-1, cocoon weight. BSR-BN (M) showed the highest rearing performance but the BSR-ISK and BSR-BN (P) M were good for yield and length of filament, respectively. On the other hand, the race Nistari (G) was poor for cocoon weight and the races Nistid white (P), BSR-BN (B1), Nistari (P), BSR-I (M) and BSR-IK (M) showed poor rearing performances for weight of mature larvae, length of filament and yield 100 dfls-1respectively in this investigation. Analysis of correlation conducted on the results of the experiment indicated that the characters of the races were correlated with yield non-significantly. Negative correlation between yield 100 dfls^-1 and no. of cocoon kg^-1 showed higher yield improvement which would be a good combination for an improved method of silk production.

Keywords: BombyxmoriL., Rearing performances, Yield, Correlation, Silk production

Location: BSRTI in Rajshahi

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Silkworm

Objectives:

The study was undertaken to analyze correlation between the yield and some yield contributing characters of eighteen races of silk worm B. morion the basis of single season rearing performance to study the relationship between yield and different yield contributing characters of silkworm for silk production under the context of Bangladesh.

Methodology:

The research work was conducted at BSRTI in Rajshahi on 18 different races of silkworm namely, Nistari, Nistari (M), Nistari (P), Nistari (L), Nistari (G), BSR-BN (B1), BSR-BN (B2), BSR-I (J), Nistari (M) B, Nistid white (P), BSR-ISK, BSR-BN (P), BSR-BN (P) M, BSR-BN (M), BSR-I (M), BSR-IK (M), BSR-IK (P) and BSR-IK (P) EL. These races were collected from the Germplasm Bank of BSRTI, Rajshahi. The rearing of silkworm was conducted for a good harvest of quality cocoon crop at silkworm research laboratory of the BSRTI.The rearing was conducted in a randomized block design with standard rearing techniques suggested by Krishnaswami (1978). To prevent diseases and to maintain good sanitation, the rearing room and other rearing appliances were disinfected with a 5% formaldehyde solution following the procedure suggested by Ullah and Narasimhanna (1978). Then the eggs were incubated at 25°C with a humidity 80% at normal daylight and dark in the night. A black pin-like spot appeared on the egg two days before hatching and on the following day it turned completely blue called body pigmentation of the egg. The eggs at this stage were disinfected with 2% formaldehyde solution for five minutes recommended by Jolly (1983) and transferred to the rearing house. The process of transferring of the newly hatched silkworms to rearing tray is called brushing which was performed with a feather following the brushing technique of Ullah and Narashimhanna (1978). Cocoons were harvested after 4 to 5 days of mounting. After that, male and female pupae were segregated and the fresh moths were allowed to mate after emergence. When the egg-laying was completed the females were subjected to microscopic examination. The eggs produced were called disease free layings (dfls) and they were utilized for experiment. After the formation and maturation of cocoons, data of different characters were collected intensively wherever necessary.

Source of Information: J. Sylhet Agril. Univ. 3(2):291-298, 2016 ISSN: 2308-1597

Article Link (Online Journal): www.jsau.com.bd

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

They suggested that breeders can select of single cocoon weight, larval weight and larval duration traits to improve the silk yield in B. mori. In the present research, it was observed that negative correlation between yield 100 dfls^-1 and no. of cocoon kg^-¹ of eighteen races of silkworm B. morion the basis of single season rearing performance would be a good combination for silk production.

Knowledge Management: Journal