• International Journal of Industrial Entomology and Biomaterials
• /
• 제14권1호
• /
• pp.63-68
• /
• 2007

The response of silkworm, Bombyx mori L. to phytoecdysteroid (PE) when administered at different ages of $5^{th}$ instar was studied in the popular bivoltine ($CSR2{\times}CSR4$) and multi${\times}$bivoltine ($PM{\times}CSR2$) silkworm hybrids, reared on the Victory-1 variety of mulberry leaves. PE was administered to $5^{th}$ instar silkworm per os at a rate of $250{\mu}g$ per 100 larvae to different batches of silkworm at 0, 24, 48, 72, 96, 120, 144 hrs and at the onset of cocoon spinning when a few larvae were ripe. The larval and mounting duration, cocoon yield and cocoon characters were influenced by PE. The intensity of influence was dependent on the time of application. The larvae treated at the beginning of the instar, improved the economic traits significantly with a marginal increase in larval duration. In the larvae treated at the middle of the instar, larval duration was shortened remarkably but the economic traits were adversely affected. This particular treatment can become a good management strategy in the case of mulberry leaf shortage or disease incidence. In the larvae treated at the onset of cocoon spinning, the mounting duration was substantially reduced without much effect on the cocoon traits which would be a big benefit in commercial sericulture. The physiological significance of varied response of silkworm to PE administration is discussed.

• 한국잠사곤충학회지
• /
• 제4권
• /
• pp.57-61
• /
• 1965

인삼물질첨식잠은 체중과 견중이 현저히 무거웠고 견층비율도 좋았으며 일부에서는 용체중의 차이점도 나타났으므로 우량잠품종육성에도 기대되는 바가 있을 것으로 본다.

• 한국잠사곤충학회지
• /
• 제41권3호
• /
• pp.154-166
• /
• 1999

General characteristics and life span of silkworm moth were investigated amongst 277 gene resources preserved and maintained in Korea. Silkworm varieties were classified according to the commercial characteristics and the viability of tested varieties. There were significant differences among the eight different commercial characteristics of silkworm such as whole larval period, duration of 5th instar, pupal body weight, single cocoon weight, cocoon shell weight, cocoon shell ratio, cocoon yield and longevity, Tropical race showed the longest life span among the other five geographical races, and followed by Japanese, European, Chinese and Korean race in order. In the longevity of each variety, Daizo(sdi) showed the shortest life span with 4.3days, and J037 was the longest as 16.0 days. Average longevity of female was 11.1 days as showed 3.0 days longer than that of male which was 8.2 days. Total average longevity of the whole varieties was 9.7days. In the correlation between the longevity and commercial characteristics, there was a tendency that the commercial characteristics became better when the life span was longer. According to the result of Complete Linkage Cluster Analysis, the genetic resources of 277 silkworm varieties classified into 5 groups such as “Group I”for short life span with low cocoon yielding “Group II”for middle life span with middle cocoon yielding,“Group III”for the shortest life span with low cocoon yielding, “Group IV”for high pupation rate and the highest cocoon yielding with comparatively long life span, and “Group V”for the longest life span with comparatively high cocoon yielding.

• 한국잠사곤충학회지
• /
• 제37권2호
• /
• pp.114-120
• /
• 1995

현재 누에 장려품종의 원종 및 교잡종을 대상으로 JH제(마니나)를 투여한 후, 발육경과일수, 화용비율, 전견중, 견층중 등의 차이를 조사하여 품종간의 JH 감수성을 비교하였다. JH제 처리에 의한 유충경과일수의 연장은 원종간에 다양한 차이를 나타내, 잠114가 2일 이상 지연된데 비하여 잠121, 잠123, 잠138에서는 거의 변화가 없었다. 유충기간의 연장과 함께 대부분의 원종에서 전견중과 견층중이 증가하였으나, 잠114의 경우에는 5령기간의 연장에도 불구하고 오히려 감소하였다. 교잡종의 경우, 모든 품종이 JH제 처리에 의해 유충기간이 1일 정도 연장됨으로서 원종에서와 같은 품종간의 차이는 나타나지 않았다. 유충섭식기간의 연장에 따라 대부분의 품종에서 전견중과 견층중이 증가하였으며 특히 사성잠, 은백잠, 삼광잠에서 JH의 효과가 뚜렷하였다. JH제의 처리에 의한 특별한 생리적장애는 보이지 않았지만, 잠122, 잠131, 잠135 및 잠138 등의 원종에서는 JH제 처리에 의해 화용비율이 10% 이상 떨어짐으로서 이들 품종에서 JH의 생리적 감수성이 인정되었다.

• 한국잠사곤충학회지
• /
• 제41권3호
• /
• pp.196-200
• /
• 1999

The flat-ways spinned cocoon was prepared from the silkworm using flat and circular type cocooning frame. The spinning rate of the silkworm was 76.9% compared to the normal mounted silkworm. The arrangement of cocoon baves of the flat-ways spinned cocoon was more linear than the normal cocoon which is curved. To maintain the size-stability of the flat-ways spinned cocoon, degumming process was treated with enzymes. These flat-ways spinned cocoons could be used as padding materials for the thermal insulations and decoration uses for the traditional fan which the silkworms are mounted directly on the fan frame.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제40권2호
• /
• pp.51-55
• /
• 2020

A new silkworm variety, Juhwangjam, was bred for the producing of light pink colored cocoon. The Juhwangjam variety was selected and succeeded from the F1 of 2303 × BP Heehong in 2016 autumn. Hatchability (96%) and pupation percentage (97.6%) of Juhwangjam was matched to the authorization criteria for commercial silkworm variety. Laval period and other economical characters of Juhwangjam were similar to the authorized silkworm variety, Goldensilk. Cocoon yield of Juhwangjam in spring and autumn season was 20.0 and 14.3 kg, respectively. Therefore, a new silkworm variety, Juhwangjam for light pink cocoon, might be adaptable to culture in spring season rather than autumn season.

• 한국잠사곤충학회지
• /
• 제27권1호
• /
• pp.31-36
• /
• 1985

한성반문 및 한성란색 계통잠에 있어서 전좌염색체로 인한 생리적 결함이 전견중, 견층중 및 견층비율에 미치는 영향을 이들에 관한 성차를 지표로 하여 검토한 결과, 한성 및 비한성 계통견의 전견중의 성차 평균치는 각각 127%, 129%, 견층중의 성차는 각각 107%, 110%, 견층비율의 성차는 공히 85%였다. 이상의 결과에서 한성반문 및 한성 난색계통잠은 전견중, 견층중, 견층비율 등의 실용형질에 관한 한 전좌된 염색체편에 기인하는 생리적 결함은 극히 미소한 것으로 생각된다.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제13권2호
• /
• pp.119-122
• /
• 2006

As the Selenium is known to be growth promoter in sheep and cattle, the efficacy of selenium has been tested in silkworm Bombyx mori L. The V instar larvae were fed with lethal and sub-lethal doses of selenium treated leaves. The larvae fed with lethal dose showed a significant decrease in growth and Cocoon commercial characters. The treatment with sub lethal dose exhibited a significant increase in the growth of the silkworm. Correspondingly, the cocoon commercial characters on exposure to the lethal dose showed significant decrease and sub lethal dose showed a significant increase. In the light of similar findings reported earlier in other cocoon crops and vertebrates, it can be inferred that selenium at lower doses acts as a growth stimulator, resulting in the higher yield of cocoon crop.

• 한국잠사곤충학회지
• /
• 제53권1호
• /
• pp.6-11
• /
• 2015

국내에서 생산한 천잠 누에고치의 일반 특성을 고찰한 결과 국내산 천잠 누에고치는 연두색 고치를 지으며, 층상구조를 가지고 있었다. 천잠 누에고치는 외피는 연두색이었고 내피는 흰색을 나타내어 천잠 누에고치의 색상을 나타내는 색소 성분은 외피에 존재하였다. 천잠 누에고치는 고치층의 무게는 0.528 g, 견층두께는 0.424 mm로 측정되었다. 천잠 누에고치를 구성하는 주요 아미노산은 알라닌, 글리신, 세린, 아스파르트산, 티로산, 아르기닌 순으로 나타났으며, X-선 회절분석 결과 $2{\theta}=16.8^{\circ}$, $20.4^{\circ}$ 부근에서 강한 회절 피크와 $2{\theta}=15.0^{\circ}$, $24.3^{\circ}$, $30.0^{\circ}$ 부근에서 날카로운 회절 피크를 나타내었다. 천잠 누에고치는 폭이 $20{\mu}m$ 정도인 섬유가 적층된 구조를 가지고 있으며, 고치의 안쪽과 바깥쪽에 흰색 결정을 가지고 있었다. 천잠 누에고치의 최대 열분해 온도는 $370^{\circ}C$ 부근이었다. 이러한 천잠 누에고치에 대한 연구 결과는 향후 천잠 누에고치를 이용한 소재 개발의 기초 자료로 활용될 수 있을 것으로 기대한다.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제14권1호
• /
• pp.15-21
• /
• 2007

Three newly authorized bivoltine silkworm hybrids namely, $CSR2{\times}CSR4$ (productive single hybrid), $(CSR6{\times}CSR26){\times}(CSR2{\times}CSR27)$ (productive double hybrid) and $CSR18{\times}CSR19$ (robust single hybrid) were chosen for the present study. These hybrids were subjected to different temperature and humidity treatments i.e., $25{\pm}$1^{\circ}C and RH $65{\pm}5%$ (control), $30{\pm}1^{\circ}C$, with combinations of low relative humidity (RH $65{\pm}5%$) and high RH ($85{\pm}5%$) at different stages during rearing and spinning of silkworm larvae. The larvae of after 3rd moult were subjected to different thermal and humidity stress till the assessment of cocoon traits. The comparative rearing and reeling performance clearly indicated that the deleterious effect of high temperature and high RH was more pronounced for the majority of traits such as cocoon uniformity, cocoon weight, shell weight, shell percentage, reelability, filament length, raw silk percentage raw silk recovery denier and waste percentage on silk weight than other temperature and RH treatments and this effect was almost similar for all three silkworm hybrids studied. The present investigation clearly indicate that the deleterious effect of high temperature and high RH was more pronounced on rearing and spinning of silkworm larvae than other temperature and RH treatments and similar effect was noticed for all the three silkworm hybrids studied. The cocoon characters can be improved by providing ideal environmental conditions even during spinning stage of larvae affected with high temperature and RH. The study also suggest that high temperature and low humidity has greater effect during rearing stage than spinning stage.