Evaluation of Bivoltine Hybrids of the silkworm,<i>Bombyx Mori</i>L.

Singh, Harjeet; Kumar, N. S.

doi:10.5958/0974-8172.2015.00028.0

Cited by 3 publications

(4 citation statements)

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“…These negative correlations may reflect other possible trade-offs between B. mori female moth fecundity and the aforementioned four lifehistory parameters. In the literature, B. mori heavy pupae result in high fecundities, and a highly significant positive correlation (r=0.84-0.92) between pupal weight and fecundity has been recorded (Govindan et al, 1990;Jayaswal et al, 1991;Singh, 1994 andSingh &Kumar, 1995). On the contrary, in the present study, B. mori pupal weight, in the control group, is negatively correlated with fecundity.…”

Section: Discussioncontrasting

confidence: 56%

“…Practically, in commercial egg production, the repeated mating performance or the re-use of B. mori male moths is common, and four matings can be used without affecting the silkworm economic parameters which relate to egg or silk production (see Jolly et al, 1966;Petkov & Mladenov, 1979;Gupta et al, 1986 andVijayan et al, 1994). Contradictory results have been reported by Wang (1994) who showed that in order to attain better productivity on the commercial level, the egg or silk production technology should not allow more than two-fold mating; where a many-fold use of B. mori male moth for mating, results in decrease in the biological quantitative parameters (Singh et al, 2003). However, based on the ANOVA of the first part data (under publication), mating with the same male (repeated matings) is seen to be beneficial and important for reproductive success in B. mori female moths.…”

Section: Discussionmentioning

confidence: 99%

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Great Expectations of Garden Cress (Lepidium sativum L.) Seed Powder in Sericulture Industry II. Correlation Studies between Certain Reproductive, Phenotypic, Biochemical, and Economic Parameters in Bombyx mori L.

Elfazairy,

Elsakhawy,

El-Meniawi

et al. 2023

Alexandria Science Exchange Journal

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This paper is a supplementary study of a research article (under publication) entitled: "Great Expectations of Garden Cress (Lepidium sativum L.) Seed Powder in Sericulture Industry"-I. With a Brief View on the Positive Effects of Mulberry Leaf Enrichment with the Various Phytochemicals in L. sativum Seed Powder on Bombyx mori L. Economic Parameters. Analysis of correlation relationships between Bombyx mori different economic parameters revealed that of the studied 39 analyses, eight, six, and twenty-five correlation relationships proved to have a significant correlation, a marginally non-significant correlation, and a non-significant correlation, respectively. The cocoon shell weight or the cocoon shell ratio (%) showed to be a function of the pupal weight or the cocoon weight, respectively. Hence, B. mori pupal weight or cocoon weight is the best reliable predictor of cocoon shell weight or cocoon shell ratio (%), respectively (r=0.936-0.982 or r=0.545-0.901, in respect). The obtained negative correlation relationships could give evidence for possible trade-offs between B. mori female fecundity and each of the following: pupal weight, female longevity, female body size, spermatophore counts per female moth, or egg size. Also, the ANOVA and the significant negative correlation relationships in the controls indicate that Lepidium sativum seed powder is an influential factor in improving the B. mori economic parameters. Application of correlationregression analyses in B. mori rearing might be advisable either to predict B. mori economically important parameters or to encourage for trade-off studies between life-history parameters which are important in B. mori rearing and selection or breeding programmes.

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Section: Discussioncontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

Great Expectations of Garden Cress (Lepidium sativum L.) Seed Powder in Sericulture Industry II. Correlation Studies between Certain Reproductive, Phenotypic, Biochemical, and Economic Parameters in Bombyx mori L.

Elfazairy,

Elsakhawy,

El-Meniawi

et al. 2023

Alexandria Science Exchange Journal

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“…Female moths of A. atlas could produce eggs within the mating duration of 3, 6, 12, and 24 h. The results presented in Table 1, showed that the length of mating times did not significantly affect the average of laying period of 5.00±0.65 d. The laying period with mating time longer than: 3 h was 4.60±0.55 d, 6 h was 5.20±0.84 d, 12 h was 5.20±0.45, and 24 h was 5.00±0.63 d, which was relatively similar amongst treatments. According to Singh et al (2003), the similar results indicates a good prospect required for cultivation process. The moth of A. atlas used chemical compounds such as pheromones to do their sexual communication with each others (Goswami & Singh, 2012).…”

Section: Mating Managementsupporting

confidence: 56%

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Med Pet

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Study on intensification program through reproduction and feeding management was conducted for six months to evaluate the growth and reproductive performance of wild silkworm, Attacus atlas. The experiment was divided into two phases: 1) the first phase was conducted on mating management, by applying different times of mating duration of 3, 6, 12, and 24 h as treatments to assess eggs production. In this phase, a completely randomized design was used, with 4 treatments and 5 replications; 2) the second phase was on feeding management, a completely randomized design method (2 x 2) was used, including feed (guava and walnut leaves) as first factor, and the second factor was feeding times (3 and 4 times/day) with 5 replications. The results obtained from the first experiment showed that different duration of mating significantly (P<0.05) affected the number of eggs produced. Based on time efficiency 6 hours mating duration produced higher egg production (226 egg/cycle), as well as hatchability (95%) than those of other mating duration. In the second experiment, it was found that there was interaction between feed types and feeding frequencies which significantly (P<0.05) affected feed consumption, feed digestibility, body weight gain, diameter of larvae and mortality rate. In conclusion, the optimum and efficient duration sugested for mating is six hours resulting high egg production. The walnut leaves feed has better effect on the first and second instar of larvae, while the guava leaves affect the following instars. In terms of production, four times of feeding frequency per day has higher productivity and is recommended in the cultivation management of A. atlas.

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“…Several studies were undertaken to evaluate and identify silkworm hybrids to improve productivity through various breeding programs by the breeders (Singh et al, 1990(Singh et al, , 1998(Singh et al, , 2001(Singh et al, , 2004Rao et al, 2004;Seshagiri et al, 2011;Seshagiri and Raju, 2016). Based on multiple trait evaluation studies, several cross breeds including MY1 x NB18, BL24 x NB4D2, BL23 x NB4D2, P2D1 x NB18 and PM x CSR2 were developed at Silkworm Breeding laboratory of CSRTI-Mysore and authorized by Central Silk Board, Bangalore for commercial exploitation.…”

Section: Introductionmentioning

confidence: 99%

DEVELOPMENT AND EVALUATION OF CROSS BREED HYBRIDS FOR BmBDV RESISTANCE THROUGH MOLECULAR MARKER ASSISTED SELECTION

RAGHAVENDAR,

VANITHA C,

NAIK

et al. 2023

AJMBES

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Bombyx mori bidensovirus (BmBDVs) are one of the causative agents of Flacherie disease which causes densonucleosis in the B.mori silkworm. In BmBDV, resistance or the non-susceptibility is governed by a single recessive gene called non-susceptibility to BmBDV (nsd-2). The deletion in nsd-2 gene is associated with the BmBDV resistance and hence can be used as a marker for molecular marker assisted breeding program. In the present study, cross breeds were developed by screening 17 multivoltine breeds popular among the breeders to develop hybrids for the Northeast regions of India. Out of 17 multivoltine, three showed presence of nsd-2 resistant allele in heterozygous/homozygous condition. Among the breeds which carry nsd-2 resistant allele, Lamerin breed showed complete homozygosity for nsd-2 resistant allele through marker assisted selection and showed complete resistance to BmBDV infection and was taken as female parent. Another productive bivoltine breed CSR2R resistant to BmBDV was developed through marker assisted backcrossing method was taken as a male parent. The control hybrids Lamerin, CSR2 as well as the BmBDV resistant LamerinR and CSR2R were further crossed to develop crossbreed and these hybrids were confirmed for BmBDV resistance through bioassay and absence of viral genome through conventional PCR.The BmBDV resistant hybrids showed >90% (90%) survivability compared to control susceptible hybrid with 10.66% survival post infection with the BmBDV. Further, the BmBDV resistant hybrids (LamerinR X CSR2R) also showed significant improvement in the pre cocoon and the post cocoon traits at par with the (LamerinXCSR2) and there was no deviation or compromise in the economic characters. Hence, the developed cross breeds with the disease resistant trait along with the improved qualitative and quantitative traits will enhance the productivity which can be successfully commercialized in Northeastern part of India and Lamerin can also be used as foundation cross in Multi x Bi hybrids (Crossbreeds).

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Evaluation of Bivoltine Hybrids of the silkworm,Bombyx MoriL.

Cited by 3 publications

References 0 publications

Great Expectations of Garden Cress (Lepidium sativum L.) Seed Powder in Sericulture Industry II. Correlation Studies between Certain Reproductive, Phenotypic, Biochemical, and Economic Parameters in Bombyx mori L.

Great Expectations of Garden Cress (Lepidium sativum L.) Seed Powder in Sericulture Industry II. Correlation Studies between Certain Reproductive, Phenotypic, Biochemical, and Economic Parameters in Bombyx mori L.

Untitled

DEVELOPMENT AND EVALUATION OF CROSS BREED HYBRIDS FOR BmBDV RESISTANCE THROUGH MOLECULAR MARKER ASSISTED SELECTION

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