Evaluation of different bivoltine pure silkworm breed for cocoon and associated parameters under Uttar Dinajpur agro climatic conditions west Bengal, India (original) (raw)
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EVALUATION OF DIFFERENT SILKWORM HYBRIDS IN JAMMU REGION
The agro climatic conditions of Jammu and Kashmir State are most ideal for bivoltine silkworm rearing. However, quality cocoon production at commercial level has suffered mostly because of inadequate quality of leaves, due to lack of infrastructure facilities for silkworm rearing at farmers level, improper diffusion of technologies required for silkworm rearing at farmers level. Besides, these factors the silkworm race reared by farmers also affects the silkworm rearing. In this direction, the present study was undertaken and four different silkworm hybrids, namely; I) SH6 x NB4D2, II) Double Hybrid (CSR6 x CSR26) x (CSR2 x CSR27), III) FC1 (CSR6 x CSR26) IV) FC2 (CSR2 x CSR27) were selected for rearing in spring season during the year 2014. These four hybrids were reared at Regional Sericulture Research Station (RSRS), Miran Sahib, Jammu, in order to evaluate the performance of different silkworm hybrids in Jammu region. Results obtained during rearing of these hybrids showed that overall performance of CSR Double hybrid (CSR6 x CSR26) x (CSR2 x CSR27) was better over the other three silkworm hybrids.
The present investigation was carried out to improve the selected quantitative traits under uniform laboratory conditions utilizing twenty five breeding lines (BL) of silkworm Bombyx mori L. during autumn season, 2017 in temperate climatic conditions of Kashmir. The breeding lines were reared over five generations and data were recorded as per the standard procedure for the calculation of all the quantitative traits namely, Fecundity (no.), hatching percentage, yield by number & weight (kg)/ 10,000 larvae brushed, single cocoon weight (g), single shell weight (g), shell ratio (%) and pupation rate (%). The data generated were subjected to the multiple trait evaluation index and among all the breeding lines, eighteen lines viz., L-1, L-2, L-3, L-4, L-6, L-7, L-11, L-12, L-14, L-15, L-16, L-7, L-18, L-19, L-20, L-21, L-22 and L-24 exhibited better performance with >50 evaluation index values, L-4 & L-9 observed moderate and L-8, L-10, L-13, L-23 & L-25 recorded least evaluation index during autumn season. Based on the results obtained from the study, the traits differences were observed between the twenty five breeding lines to be considered as the variable effects among the lines during autumn season. It is found that, the 18 lines with >50 evaluation index values have shown significant influence on the expression of quantitative traits and have economical importance under the study. Hence, obtained results from the study will conveniently be utilized for selecting best breeding lines for evolving suitable breeds during autumn season in temperate region of the Kashmir and will be helpful in the field of silkworm breeding and genetics programmes.
International journal of advanced biochemistry research, 2024
The present investigation was carried out at Division of Sericulture Crop Improvement of College of Temperate Sericulture, Mirgund and Division of Basic Science and Humanities, of Faculty of Horticulture, SKUAST-Kashmir, Shalimar during the year 2021 and 2022. Rearing of twelve bivoltine mulberry silkworm breeds(6 plain) namely CSR17, CSR50, CSR27, CSR52, SK7, SK6 and (6 marked) namely SK4, BHR3, CSR26, CSR53, M46 and Sanish 8 were used in this study. During these seasons (spring and autumn) CSR26 breed excelled in most of the parameters excluding fecundity which was highest i.e 590.721 and 567.667 eggs/ laying recorded in Sanish 8. In case of larval characters the CSR26 breed recorded lowest desirable total larval duration of 27.120 and 29.025 days, highest larval weight of 46.097 and 42.885 g, highest silk gland weight of 1.556 and 1.482 g, highest silk gland tissue somatic index of 33.755 and 34.574 %,. In case of other commercial characters of cocoons the highest cocoon yield of 9260.266 and 8841.950 per 10,000 larvae by number, highest cocoon yield of 16.938 and 15.381 kg per 10,000 larvae by weight, highest pupation rate of 93.580 and 90.954%, highest cocoon weight of 1.840 and 1.792 g, highest shell weight of 0.379 and 0.343g, highest shell percentage of 20.597 and 19.173 % highest hatching percentage of 96.283 and 91.743 % was also recorded in CSR 26. In case of post cocoon parameters the highest filament length of 1015.167 and 956.728m, lowest desirable denier of 2.237 and 2.152, highest raw silk percentage of 16.663 and 15.413 % was recorded in CSR26 during both the seasons respectively. Among the twelve breeds which were taken for studies CSR26 performed best followed by M46 and BHR3 breed which is a marked breed. However among the plain breeds CSR27 breed is at the top followed by CSR50 and CSR17.
The present study was undertaken to evaluate the performance of eleven bivoltine silkworm, Bombyx mori L, breeds (CSR2, CSR6, CSR27, CSR26, CSR50, PAM114, PAM117, APS4, APS5, SK6 and SK7) of different origin under temperate climatic conditions during spring, summer and autumn, 2018 at Central Sericultural Research and Training Institute, Pampore, Jammu and Kashmir. The rearing was carried out under uniformed laboratory condition by adopting the standard method. These eleven breeds were evaluated for their performance in eight metric traits viz., fecundity (No.), hatching (%), yield per 10,000 larvae by number and by weight (kg), single cocoon weight (g), single shell weight (g), shell ratio (%) and pupation rate (%). The performance of breeds varied from season to season since they originated from different progenitors. The data generated was analyzed statistically and subjected to multiple trait Evaluation index (E.I). On the basis of the evaluation index values ranking CSR2, CSR26, CSR27, CSR50, PAM114 and PAM117 performed well in all the three seasons with E.I values above 50. Two breeds APS5 and CSR6 recorded E.I values below 50 in all the three seasons. APS4 has performed well in only spring season whereas SK6 and SK7 recorded E.I values above 50 in summer and autumn only. Based on their performance in all the three seasons, these parental breeds will be utilized for development of foundation crosses which will be further shortlisted for the development of bivoltine silkworm double hybrids suitable to temperate region of J&K as an alternate for ruling CSR double hybrid.
West Bengal is one of the major mulberry silk producing states of India. The hot and humid climatic condition of West Bengal is the main factor restricting the bivoltine silkworm rearing during unfavourable seasons. This study aims to evaluate the twenty-five bivoltine hybrids (oval × dumbbell) identified as tolerant to high temperature and high humidity conditions of West Bengal. All the hybrids were reared at 25 ± 1°C till 5th instar 2nd day. On 3rd day of 5th instar, 100 larvae each of the twenty-five bivoltine hybrids were reared at 35 ± 1°C and 85 ± 5% RH with SK6 × SK7 and B.Con 1 × B.Con 4 as control hybrids for 6 hours every day to till spinning. Data on economically important rearing traits were collected. One sample t test revealed significant differences (p<0.01) among the traits. Based on the high pupation percentage at 35 ± 1°C and 85 ± 5% RH and low reduction in pupation percentage, HTH3 × HTH6 and HTH4 × HTH9 were identified as high temperature and high humidity tolerant hybrids in comparison with control hybrids. These hybrids also performed better in terms of cocoon characters in comparison to the control hybrids. Therefore, HTH3 × HTH6 and HTH4 × HTH9 are identified as promising hybrids that are suitable for rearing under the high temperature and high humidity conditions of West Bengal. However, field trial of these hybrids along with the control hybrids has to be done for confirming these findings.
Success of silkworm breeding largely depends upon the initial selection of parents, their effective utilization in desirable combination followed by appropriate selection procedures. Silkworm breeders across the country contributed significantly to the development of many bivoltine breeds not only with improved economic parameters but also having suitability for variable climatic conditions. With this aim, the study was carried out to evaluate the performance of the nineteen bivoltine silkworm genotypes viz., Chaung Naung, Sanish-18(M), Pam 114, Pam 117, CSR2, CSR6, CSR26, CSR27, CSR47, S8, N5, SK-6, SK-7, B.Con-1, B.Con-4, Dun-6, Dun-22, APS-4 and APS-5 evolved/maintained by different breeding institutes of India. The evaluation of the selected genotypes was carried out for various traits during spring (May-June), summer (July-August) and autumn (August-September) season 2018 at Central Sericultural Research and Training Institute, Central Silk Board, Pampore, Kashmir. On the basis of the evaluation index values ranking, the high performing silkworm genotypes were identified for spring, summer and autumn seasons which will serve as breeding resource material for further identification of season-specific hybrids for Kashmir Division of J&K state. The study revealed that genotypes Pam 117, CSR 2 and CSR 27 performed better in all the three rearing seasons’ viz., spring, summer and autumn.