Relevant bibliographies by topics / Bivoltine races

Academic literature on the topic 'Bivoltine races'

Author: Grafiati
Published: 18 May 2024

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Journal articles on the topic "Bivoltine races"

1

Rudramuni, Kiran, Shiv Kumar, Bharath K. Neelaboina, Mir N. Ahmad, and Sukhen R. Chowdhury. "Atypical voltinism in mulberry silkworm Bombyx mori L., 1758 (Lepidoptera: Bombycidae) races Barapat and Barapolu." Entomological Communications 3 (January 4, 2021): ec03001. http://dx.doi.org/10.37486/2675-1305.ec03001.

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The mulberry silkworm, Bombyx mori L., 1758 (Lepidoptera: Bombycidae) is classified as univoltine, bivoltine, and polyvoltine based on the annual brood frequency. Voltinism in B. mori is characterized by the occurrence of embryonic diapause (facultative and obligatory diapause). Univoltine silkworms suited to cold and temperate regions lay diapausing eggs and polyvoltine silkworms suited to tropical regions lay non-diapausing eggs. In contrast, the occurrence of diapause in bivoltine silkworms is influenced by the environment. In addition to the difference in the occurrence of embryonic diapause, larval duration, and cocoon characters show distinct variations. In the present correspondence, we are presenting an interesting observation from two silkworm races Barapath and Barapolu originating from the North-East region of India that display divergence in voltinism. The unique characteristic features of univoltine, bivoltine, and polyvoltine observed in the races are discussed explaining the occurrence.
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A. C, Manjula, Jenifer Lolita. C, Shubha Shubha, Prathibha K.Y, and Keshamma E. "Evaluation of Matured Larval Weight and Larval Duration of New Breeding Lines of Bombyx mori L." International Journal of Advances in Agricultural Science and Technology 8, no. 10 (October 30, 2021): 7–16. http://dx.doi.org/10.47856/ijaast.2021.v08i10.002.

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We planned to conduct this study with the main aim to develop bivoltine breeds for our tropical climatic conditions by using silkworm breeds with known genetic backgrounds (KA, NB18 and PM) in various hybrid combinations and incorporating them over generations, followed by backcrossing and adequate selection of different generations with the objective of profitability and productivity. The isolated Bivoltin lines (R1 and R2) were reared with their parental races at different times of the year to evaluate their stability in the expression of commercial traits. For the present breeding program, the purebred Bivoltine Kalimpong-A (KA), which spin white oval cocoons, New Bivoltine18 (NB18) white cocoons with rotating dumbbells and Multivoltine Pure Mysore (PM), the yellow pointed cocoons of the mulberry silkworm Bombyx mori L., Selected. One-way and three-way crosses were made using the above three breeds. The first single cross comprised KA females and PM males. The second unique cross comprised NB18 females and PM males. Selection was performed at the egg, larva, pupal, and cocoon stages over the course to determine the desired traits. The offspring of F from the respective crosses were backcrossed with their respective bivoltine males to improve commercial traits. Heterosis in the F1 generations of crosses, including NB18 and PM, was determined by the mean score of the parents (MPV) and the best score of the parents (BPV). A significant test for heterosis was performed using a standard ANOVA table. Based on the results of our study, it was found that the performance of the characters, viz. The weight of mature larvae and the duration of the larvae over generations do not simply increase or decrease regularly, but fluctuate irregularly. The reason for this variation may be due to random genetic drift, sampling errors in estimating generational means, selection pressures, and environmental factors. Therefore, inbreeding variations due to random drift and sampling errors could be reduced by increasing the number sampled and selected.
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K A, Murugesh, Mahalingam C A, and Philip Sridhar R. "Silk Productivity and Yield Related Characters of Selected Pure Races of Mulberry silkworm, Bombyx mori L." Madras Agricultural Journal 100, June (2013): 539–42. http://dx.doi.org/10.29321/maj.10.001352.

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Experiment was conducted to study the cocoon, biological and yield related characters of selected pure races of Bombyx mori L. Among the multivoltine races, significantly higher cocoon, biological and yield related characters were observed in AGL3 and low in Pure Mysore. Among the bivoltine races, significantly higher characters were observed in CSR2 and low in NN6D. The silk productivity had significant positive correlation with the cocoon and yield related characters whereas fifth instar larval duration, cocoon length and breadth ratio, and renditta were negatively correlated, among all the 10 pure races tested.
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Rajagopal, V., H. L. Ramesh, V. N. Yogananda Murthy, and K. N. Ninge Gowda. "Efficacy of fungicide ‘Kavach’ against Beauveria bassiana L. in silkworm Bombyx mori L." Journal of Applied and Natural Science 6, no. 1 (June 1, 2014): 31–37. http://dx.doi.org/10.31018/jans.v6i1.371.

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Silkworm Bombyx mori L. is prone to be attacked by pathogen and more notably Beauveria bassiana L. Bed disinfectant Kavach was inoculated in different dosages (0.2%-1.6%) to IV and V instar silkworms of both bivoltine and cross breeds. Potency of disinfectant was assessed for the parameters such as survivability, larval duration, physiological, chemo and bio-assay tests. It was revealed that, bivoltine (NB4D2) silkworms were highly susceptible to diseases compared to cross breeds (PMxNB4D2). In bivoltine silkworms, survivability was found to be 61.15% at 1.6% of Kavach, when dusted twice during IV and V instar and crossbreed silkworms exhibited better resistance of 63.10% with the same treatments. Kavach treated silkworms showed decreased larval duration compared to control worms. Crossbreed silkworms were capable of maintaining high level of soluble proteins in spite of infection on 3rd day (17.40%), 4th day (20.50%) and 5th day (21.55%) whereas in bivoltine silkworms soluble protein level was brought down on 3rd day (19.30%), 4th day (22.40%) and 5th day (23.40%). Total soluble sugarsvaried from third day till fifth day in both the races. Kavach dusted twice at 1% proved to be very useful in the improvement of various commercial cocoons characters.
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M, Muthulakshmi, Balachandran N, Raina S K, Pankaj Tewary, Babu G K S, and Kamble C K. "Performance of Bivoltine Silkworm Germplasm under High Temperature and High Humidity of Jammu Region." Madras Agricultural Journal 98, March (2011): 95–98. http://dx.doi.org/10.29321/maj.10.100252.

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Autumn silkworm crop is distinguished by high temperature and high humidity in Jammu and there is an urgent need to develop hardy bivoltine breeds/hybrids, which can withstand the autumn conditions of Jammu region to make sericulture activity profitable in the traditional sericultural state of Jammu and Kashmir. Though mulberry leaves are available in plenty during this season the silkworm crop during autumn season is generally a failure in Northern India. In order to identify suitable silkworm races, selected bivoltine silkworm germplasm were evaluated under abiotic stress conditions of high temperature and high humidity prevailing during autumn season in Northern India. Ten test accessions out of 230 bivoltine silkworm accessions were selected based on economically important rearing and post cocoon parameters and evaluated in the RSRS, Jammu conditions. The accessions were BBE-0173, BBE-0174, BBE-0178, BBE-0186, BBE-0189, BBE-0192, BBE-0198, BBE-0226, BBI-0239 and BBE-0266 with two control accessions (one local, ie., BBI-0116 for Jammu) and one common national control ie., BBI-0290). Six trials were conducted in the location in both the favourable (Spring) and unfavourable (Autumn) seasons. Test accessions BBE-0178 and BBE-0266 performed better during both spring and autumn seasons not only for rearing traits but also for post cocoon parameters. These accessions can be used to evolve suitable silk worm breeds or breed combinations through breeding programmes to stabilize autumn crop rearing.
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Kumari., Anita. "GENETIC DIVERSITY STUDIES IN SIX BIVOLTINE RACES OF BOMBYX MORI L., BASED ON PHENOTYPIC CHARACTERS." International Journal of Advanced Research 5, no. 1 (January 31, 2017): 1048–54. http://dx.doi.org/10.21474/ijar01/2851.

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7

Hossain, Shakhawat, Roushown Ali, and Tariqul Hasan. "Extraction and Characterization of Sericin from Cocoon of Four Different Silkworm Races Bombyx Mori L." European Journal of Advanced Chemistry Research 4, no. 3 (June 1, 2023): 45–52. http://dx.doi.org/10.24018/ejchem.2023.4.3.134.

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The removal and use of sericin could have a strong economic, social, and environmental impact, particularly in countries where sericulture is practiced, especially in Bangladesh. Because in our country Bangladesh, sericin is a waste material in the sericulture industry. Several techniques have been adopted for sericin extraction, but maintaining its chemical properties after extraction and environment-friendly extraction methods are still a major challenge. Sericin is fully or partially hydrolyzed and solubilized during the degumming of the cocoon. Consequently, it is important to create sericin extraction procedures that require less energy, don't release any chemicals, and don't harm the environment. Numerous research has been done to extract sericin but the differences in sericin content and chemical properties of Bivoltine and Multivoltine silkworm cocoon have not been studied yet. In this work, sericin was extracted from the silkworm cocoon of four different silkworm races at two different temperatures and durations. Significant differences were observed in yield% with different silkworm races and different treatments. Extracted sericin was characterized through SDS PAGE, FTIR & UV spectroscopy, and TGA.
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8

Maddi, Priyadarshini P., and Yatheesh K. Rawgol. "The Influence of Vermiwash Sprayed Mulberry on Some Growth and Silk Parameters of Silkworm Bombyx Mori L." Mapana - Journal of Sciences 7, no. 2 (November 30, 2008): 52–69. http://dx.doi.org/10.12723/mjs.13.6.

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The influence of vermiwash on growth in terms of weights and sizes of larvae, feeding response in terms of ingestibility and digestibility, silk parameters including cocoon weights, silk yarn lengths and weights, NBFL and denier of silk yarn of the mulberry silkworm Bombyx mori L. belonging to two races - hybrid multivoltine KG race, and pure bivoltine CSR-2 have been studied. Though total ingestion and ingestibility percentage of the larvae was found to be the least in the single-feed group of KG race , denier, length and weight of silk yarn, NBFL, of the group showed higher values than the two-feed and control groups. Shortening of the larval period in KG race and influence on the cocoon shapes, sizes and consistency of cocoons of CSR 2 have also been observed.
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9

Temak, G. D., P. K. Nalwandikar, and P. R. Shinde. "Effect of feeding mulberry variety V1 on the biology of different bivoltine silkworm (Bombyx mori L.) races." Journal of Entomological Research 42, no. 1 (2018): 93. http://dx.doi.org/10.5958/0974-4576.2018.00016.6.

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Temak, G. D., P. K. Nalwandikar, and P. R. Shinde. "Expression of the economic traits in different bivoltine silkworm (Bombyx mori L.) races reared on mulberry variety V1." Journal of Entomological Research 41, no. 2 (2017): 193. http://dx.doi.org/10.5958/0974-4576.2017.00031.7.

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Dissertations / Theses on the topic "Bivoltine races"

1

Ramesh, C. K. "Development of Hardy bivoltine Races of Silkworm Bombyx Mori L." Thesis, 1996. http://hdl.handle.net/2009/5971.

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Maribashetty, V. G. "Evolution of superior bivoltine races of silkworm. Bombyx mori. L for tropics." Thesis, 1991. http://hdl.handle.net/2009/1465.

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Rajanna, G. S. "Evolution of suitable bivoltine races of silkworm bombyx mori L. for tropics." Thesis, 1989. http://hdl.handle.net/2009/2840.

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4

Chandrashekharaiah. "Studies on the genetics of quantitative traits in a few multivoltine and bivoltine races of silkworm Bombyx. Mori L." Thesis, 1992. http://hdl.handle.net/2009/1408.

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5

Malik, Manzoor Ahmed. "Studies on the performance and adaptation of bivoltine races of silkworm, bombyx mori L. of Kashmir and evaluation of heterosis in their hybrids under temperate and subtropical climates." Thesis, 1992. http://hdl.handle.net/2009/2779.

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