• International Journal of Industrial Entomology and Biomaterials
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• 제6권1호
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• pp.15-19
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• 2003

The study evaluated the influence of feeding different maturity leaves i.e., tender, medium, coarse and mixed leaves of three different maturity during late larval stages of new bivoltine race $(CSR_{3} {\times} CSR_{6})$. The data were compared with shoot feeding and control batches in which conventional feeding method was followed. The most of the larval and cocoon characters were recorded significantly higher in tender leaves fed batches followed by T4 batch (2 times tender and 1 time coarse leaves). Lowest melting percentage (1.494%) was recorded in T4 and highest (4.69%) was recorded in coarse leaf (T3) fed batches. Significantly higher post cocoon parameters viz., average filament length, non-breakable filament length, renditta and raw silk percentage were recorded in tender loaves fed batches.

• 한국잠사곤충학회지
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• 제8권
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• pp.63-67
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• 1968

견사량과 관계가 있는 견층비율과 견층 연감율을 우리나라 보존잠품종별로 조사한 바 다음과 같은 결과를 얻었다. (1) 견층비율과 견층 연감율간에는 상관이 없었으며, 전견중과는 중국계통에서만 정(＋)의 상관이 있었다. (2) 계통별로는 연감율의 차이가 없으나 품종간에는 차이가 있었다. (3) 숫컷의 연감율보다 암컷의 연감율이 높았다.

• 한국잠사곤충학회지
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• 제31권1호
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• pp.25-36
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• 1989

누에 품종 육성을 위한 기초자료를 얻기 위해 7개 품종을 이면교잡하여 얻은 F1, F2세대에 대한 유전자의 분포상태와 우성정도, 분산성분과 성분비 등을 분석한 결과를 요약하면 다음과 같다. Vr-Wr graph는 F1세대에서 견장의 자, 단견중의 자웅, 견층 연감율의 자웅, 견사량이 모두 초우성이었다. 또 5령경과와 견층중, 견층비율의 각 자웅, 견사장 등은 불완전 우성으로 표현되었다. F2세대는 5령경과, 전령경과와 견장, 견폭, 단견중, 견층중, 견사량은 모두 불완전 우성으로 나타났다. 유전 분산성분에서 F1세대의 5령경과와 견폭, 견층중, 견층비율, Fibroin량의 각 자웅은 유전지의 상가적 효과가 우성 효과보다 크게 평가되었다. F2세대의 견촉, 견층중, 견층비율, fibroin량의 각 자웅도 상가적 효과가 우성 효과보다 크게 표현되었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제22권2호
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• pp.45-49
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• 2011

The performance of five newly evolved cross breeds were evaluated across seasons to understand the genotype and environment interactions and their stability under fluctuating tropical environmental conditions along with control hybrids $PM{\times}CSR2$ and $APM1{\times}APS8$. The data was collected on eight economic traits namely fecundity, yield per 10,000 larvae by number, yield per 10,000 larvae by weight, survival rate, cocoon weight, cocoon shell weight, cocoon shell ratio and filament length. The data was subjected for Analysis of Variance (ANOVA) and relevant statistical methods. The performance data obtained was further subjected for multiple trait evaluation index method. The ranks were adjudicated based on the index values. The two hybrids viz., $MSO3{\times}APS45$ and $MSO1{\times}APS12$ performed well under diversified environmental conditions indicating their overall stability and superiority. These hybrids revealed highly significant (p < 0.01) improvement for the majority of the traits over the control hybrids.

• International Journal of Industrial Entomology and Biomaterials
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• 제23권2호
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• pp.187-191
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• 2011

An attempt was made to assess the potentiality of bivoltine double hybrids under simulated conditions of farmers to identify the suitable bivoltine double hybrid combination. Four bivoltine double hybrids developed at Central Sericultural Research and Training Institute (CSRTI), Mysore along with popular single hybrid, $CSR2{\times}CSR4$ as control was assessed for economic traits. The rearing results showed significant improvement of 20-24% in fecundity of the double hybrids studied over single hybrid. Among the double hybrids, $[D7{\times}S5]{\times}[D13{\times}S1]$ recorded significantly higher survival (89.58 %), cocoon yield (76.328 kg/ 50,000 eggs), cocoon price (Rs. 180.87/kg) and lower cocoon leaf ratio of 1: 21.80. The performance of the reeling traits were also found significantly superior in $[D7{\times}S5]{\times}[D13{\times}S1]$ with higher filament length (1100 m), reelability (88%), raw silk (18.55%) and neatness (92 points) compared to $CSR2{\times}CSR4$ and other double hybrids evaluated. Besides, the cocoons of $[D7{\times}S5]{\times}[D13{\times}S1]$ exhibit uniformity in size with a standard deviation of < 8. Overall data indicated the superiority of $[D7{\times}S5]{\times}[D13{\times}S1]$ compared to the other hybrids evaluated and it has profound influence in expressing the full potentiality in the field.

• BMB Reports
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• 제41권3호
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• pp.236-241
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• 2008

The antioxidant potential of silk protein sericin from the non-mulberry tropical tasar silkworm Antheraea mylitta cocoon has been assessed and compared with that of the mulberry silkworm, Bombyx mori. Skin fibroblast cell line (AH927) challenged with hydrogen peroxide served as the positive control for the experiment. Our results showed that the sericin obtained from tasar cocoons offers protection against oxidative stress and cell viability is restored to that of control on pre-incubation with the sericin. Fibroblasts pre-incubated with non-mulberry sericin had significantly lower levels of catalase; lactate dehydrogenase and malondialdehyde activity when compared to untreated ones. This report indicates that the silk protein sericin from the non-mulberry tropical tasar silkworm, A. mylitta can serve as a valuable antioxidant.

• International Journal of Industrial Entomology and Biomaterials
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• 제10권2호
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• pp.153-157
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• 2005

Recently two breeding programs were carried out for isolation of new parental inbred lines in Iran. This study was undertaken in order to estimate the combining ability effects and heterosis of these lines. For this purpose an $8\times8$ diallel cross analysis including eight inbred lines of silkworm with four lines from each program were studied for their five quantitative traits. The results indicated that reciprocal effects appeared insignificant for most of traits. Japanese lines of 111 and 113 were best combiners for shell weight, cocoon weight and shell percentage traits. With respect to pupation rate, Chinese line 110 was the best and according to general combining ability (GCA) and specific combining ability (SCA) variances, it is superior in specific combinations. Hybrid $109\times110$ showed better characters for both productive and viability traits. Hybrids with high heterosis had high SCA too.

• International Journal of Industrial Entomology and Biomaterials
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• 제14권2호
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• pp.93-97
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• 2007

A Silkworm breeding programme was designed to develop a robust but productive bivoltine silkworm hybrid of Bombyx mori L. suitable for rearing throughout the year in tropical climate by utilizing indigenous polyvoltine and productive bivoltine breeds. The breeding was carried out under high temperature ($36^{\circ}C{\pm}1^{\circ}C$) and low humidity ($50{\pm}5%$) conditions in the environmental chamber. By $F_{12}$, three oval and three dumbbell breeds were isolated with higher survival and productive merits. These breeds were utilized in the hybrid evaluation along with other popular breeds. Based on combining ability test results, the hybrid $SR_2{\times}SR_5$ was selected for large scale testing and evaluated in different seasons. The evaluation studies indicated that the hybrid has higher viability and productive merits and it is suitable to rear throughout the year. The hybrid $SR_2{\times}SR_5$ recorded a survival of 92.0%, cocoon shell weight of 0.417 g, cocoon shell percentage of 23.0 and a filament length of 1042 meters under hot and dry conditions of environmental chamber compared to the control thermo-tolerant hybrid $CSR18{\times}CSR19$.

• International Journal of Industrial Entomology and Biomaterials
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• 제8권1호
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• pp.113-115
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• 2004

Six generations (P$_1$, P$_2$, F$_1$, BC$_1$, BC$_2$ and F$_2$) of four bivoltine silkworm crosses (SKAU-R-1 ${\times}$ Yakwei, SKAU-R-6 ${\times}$ Yakwei, CSR$_2$ ${\times}$ CSR$_4$ and SH$_{6}$${\times}$ NB$_4$D$_2$) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single cocoon weight, single shell weight, and shell ratio ％), were subjected to Cavallis joint scaling test. Additive dominance model was found to be adequate in CSR$_2$${\times}$CSR$_4$ and SH$_{6}$${\times}$ NB$_4$D$_2$ for single cocoon weight and shell weight and SKAU-R-6 ${\times}$ Yakwei for shell ratio(％). Whereas, in rest of the crosses epistasis was evident in the traits under investigation. Magnitude of additive gene effect (d) was greater than dominance(h) in SH$_{6}$${\times}$NB$_4$D$_2$ and SKUA-R-6${\times}$Yakwei for shell ratio (％) and in CSR$_2$${\times}$ CSR$_4$ for shell weight. Thus selection for these traits in early segregating generations of these crosses would be effective for obtaining considerable genetic gain. gain.

• 한국잠사곤충학회지
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• 제23권1호
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• pp.32-37
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• 1981

누에의 人工飼科는 物理的 또는 化學的으로 뽕잎과는 그 性質이 매우 다르기 때문에 고치 生産性에 있어서 뽕잎의 경우 보다 不良한 成績인데 이 欠點을 解決하기 위하여는 우선 人工飼科에 適合한 品種이 育成되어야 한다. 그러므로 本試驗에서는 人工飼科育에 의하여 優良系統을 選拔했을 때에 發生하는 現象을 究明코저 遂行하였으며 그 結果는 다음과 같다. 1. 암고치의 繭層重과 繭層比率과의 相關關係는 Sa와 Y에서는 없다. 2. 숫고치에서 Sa系統의 全繭重과 繭層比率과는 相關關係가 없다. 3. 人工飼科育에 있어서 日本種系統과 中國種系統은 각각 選拔效果가 特異하게 나타났다. 4. 桑葉育에서 人工飼科育으로 전환하는 第1世代에서는 Sa와 Y系統이 모두 매우 不良한 成績을 나타냈으나 第 2, 3世代에서 急激하게 증가하여 選拔效果는 매우 컸다. 5. 第 4 世代에서는 致死率이 매우 높았기 때문에 第 5世代는 桑葉育으로 繼代 增殖하였다. 6. 第 6 世代에서 10世代까지 選拔效果는 계속 증가하였는데 繭層比率만은 例外이었다.