• 한국잠사곤충학회지
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• 제39권2호
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• pp.140-145
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• 1997

Silkworm fed on mulgerry leaves with 1000 times diluted Insegar(main component : Fenoxycarb, ethyl-2-(4-phenoxyphenoxy)ethylcarbmate) and its effects was investigated on increase of the 5th larval silkgland weight and silk quality. The oral application of fenoxycarb showed increase of the silkgland weight. The whole period of the silkgland weight falls on the 2nd instar treatment by 13%, the 3rd day of the 4th instar by 111%(3100 mg) and the whole period of the 5th instar treatment rather decreased it by 66%(497 mg), as compared to 1470mg of the control. Female and male both increased 15%(1779mg) and 12%(1554mg) of the silkgland weight with the 2nd instar treatment, as compared to 1548mg and 1391mg in control, respectively. 118%(3368mg) and 104%(2832mg) of increase in the silkgland weight were also showed with the 3rd day of the 4th instar treatment but 70%(463mg) and 61%(539mg) of decrease were shown with the 5th instar treatment. The maximum weight of the middle silkgland weight increased by 6%(1248mg) and 127%(2673mg) with the 2nd instar and with the 3rd day of the 4th instar, respectively but 67%(393mg) of decrease took place, as compared to 1175mg of the control. The maximum increase of the posterior silkgland weight with whole peried of the 2nd instar treatment increased 12%(419mg) and 75%(656mg) and 64%(135mg) of decrease was shown, as compared to 374mg of the control. The oral application of Insegar at the 2nd instar increased 26 m of cocoon length, 4.0 cg of the cocoon filament weight and 0.21d of the silk denier, as compared to 1147 m of the cocoon length, 38 cg of the cocoon filament, 2.99d of the silk denier, weight of cocoon filament and silk denier, respectively but denier variance narrowed to 0.33d, as compared to that of the control.

• 한국잠사곤충학회지
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• 제42권1호
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• pp.24-27
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• 2000

A new silkworm variety 'Yangwonjam'for both of spring and autumn rearing season is F$_1$hybrid between Jam 143, a Japanese race bred from H5R1/P8503 and Jam 144, a Chinese race from M8312/8190. This is the first both parent sex-limited larval marking variety in Korea, and which contributes to eggs production of F$_1$hybrid silkworm with saving labor. Jam 143, Japanese parent of the 'Yangwonjam'showed high GCA in pupation percentage and Jam 144, Chinese parent showed high GCA in pupation percentage and single cocoon weight. In the local adaptability test performed at 8 local areas in spring of 1998, Yangwonjam records 1% higher in pupation percentage and 5%, 4% lower in single cocoon weight, cocoon yield from 10,000 3rd molted larvae respectively than the check variety Kumokjam. Also in the resistance test against unfavorable rearing condition performed in spring of 1997, Yangwonjam records 9%, 14% lower in single cocoon weight, cocoon shell weight respectively than the check variety, but showed 1% higher in pupation percentage than check variety.

• 한국잠사곤충학회지
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• 제32권1호
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• pp.31-37
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• 1990

세직도견사의 생산을 최종목적으로 해서, imiazole 계항유약 호르몬 활성물질의 1종인 "KK-42"의 투여와 고온처리에 의해서, 효과적인 조숙 3면잠의 유발조건을 탐색하고, 유발된 3면잠의 성장, 사료 효율 및 견사질을 조사한 결과는 다음과 같다. 1. KK-42의 투여에 의하여 고율로 조숙 3면잠이 유발되었다. 효과적인 KK-42의 농도는 10$\mu\textrm{g}$/마리이었다. 한편, 고온처리에 의한 조숙 3면잠의 유발은 KK-42의 투여에 비하여 적었고, 3령누에를 38$^{\circ}C$에서 48시간 처리한 것이 36시간처리한 것보다 효과적이었다. 2. KK-42에 의한 조숙 3면잠의 최대체중은 약 1.8g로서, 대조의 4면잠에 비하여 상당히 가벼웠고, 4령기의 성장은 4면잠의 5령기에 가까운 종령기적 패턴을 나타내었다. 3. KK-42의 투여와 고온처리에 의한 조열 3면잠의 경과일수는 대조의 4면잠에 비하여 상당히 단축되었다. 특히, 뽕잎육에 있어서 KK-42에 의한 조숙 3면잠의 경과일수는 4면잠에 비하여 5.17일 단축되었다. 4. 조숙 3면잠의 견과 견사직도는 대조의 4면잠에 비하여 상당히 작고 가늘었다. 즉, 조숙 3면잠견의 견사직도는 KK-42를 처리한 경우 1.39d이고, 고온처리한 경우 1.88d이었다. 5. 조숙 3면잠견의 견사크기는 KK-42의 투여나 고온처리나 다같이 대조의 4면잠에 비하여 상당히 작았다. 6. KK-42에 의한 한숙 3면잠의 사료효율은 대조의 4면잠에 비하여 낮은 편이었다. 즉, 조숙 3면잠(대성잠)의 견층중 1g당 식하건물뽕잎량은 7.97cg인데 비하여 대조의 4면잠은 9.20cg이었다.

• 한국잠사곤충학회지
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• 제36권2호
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• pp.124-129
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• 1994

우리 나라에서 시판되는 Imidazole계 살균제 Trifumin 이용에 의한 세염도고치의 생산 가능성을 검토할 목적으로서, Trifumin을 3령, 4령 누에에 투여하여 유발된 조숙 3령잠의 견사질, 사료효율 및 Trifumin 투여에 의한 견층 fibroin 성분에 미치는 영향에 대하여 조사하였다. 1. Trifumin 투여에 의한 조숙 3면잠 고치는 견형이 작아지고 견중 및 견층중이 감소하였는데, 그 정도는 Trifumin 투여시기에 따라 달라지고 3령초기보다도 4령초기 투여가 현저하였다. 견층중에 있어서 3령초기 투여에 의한 3면잠 고치는 대조의 4면잠 고치(100)에 대해 60%, 4령초기에 의한 3면잠 고치는 26%였다. 2. 식하건물 1g당 견층 생산량은 대조의 4면잠(100)에 대해 4령초기 투여에 대한 조숙 3면잠에 있어서는 94%, 4령초기 투여에 의한 조숙 3면잠에 있어서는 85%였다. 3. 조사성적은 대조의 4면잠 고치(100)에 대해 3령초기 투여에 의한 조숙 3면잠 고치에 있어서는 견사장 100%, 견사량 60%, 견사섬도 60%, 해서율 97%, 생사량비율 90%였다. 또한 4령초기 투여에 의한 조숙 3면잠 고치에 있어서는 견사장 74%, 견사량 26%, 견사섬도 36%, 해서도 110%, 생사량비율 59%였다. 4. 견층fibroin 성분에 있어서는 Trifumin 처리에 의한 조숙 3면잠 고치와 대조의 4면잠 고치간에 차이가 없었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제10권2호
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• pp.107-117
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• 2005

Oral supplementation of minerals mixture of potassium bromide and nickel sulphate on $CSR_2,\;CSR_4\;and\;CSR_2{\times}CSR_4$ crossbreed races with different concentrations (70, 110 and $160\;{\mu}g/ml$) were fed to the fifth instar larvae. Two of the four normal feeds per day was substituted with treated leaves fed to silkworm at fifth instar larvae. The controls were fed with the leaves sprayed with distilled water and normal leaves. The $CSR_4$ race treated larvae showed a significant increase in silkgland weight, cocooning percentage, female cocoon weight, male cocoon weight, male cocoon shell weight, male cocoon shell ratio, filament length, filament weight, denier, fecundity, number of eggs per ovariole and length of the ovariole when compared with those of the corresponding parameters of the carrier control, whereas in $CSR_2\;and\;CSR_2{\times}CSR_4$ crossbreed races showed a significant increase in larva1 weight and other parameters similar to that of $CSR_4$ race. The results suggested that the silkgland showed good response to minerals mixture of potassium bromide and nickel sulphate only in $CSR_4$ race when compared with those of other two races of the silkworm, B. mori.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권2호
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• pp.117-125
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• 2003

To know the impact of female pupal weight corresponding to the male cocoon shell weight upon fecundity, hatchability and percentage of non-viable eggs, the experimental multivoltine breeds namely BL67 and 96A were categorised into low, medium and high batches according to the weight of female pupae and male cocoon shells and moths emerged from low, medium and high female pupae were allowed to mate withmoths emerged from low, medium and high male cocoon shells. Both the experimental breeds of BL67 and 96A revealed a fairl trend in fecundity for high batch ＞ medium batch ＞ low batch. When data were statistically analysed, a significant (p ＜ 0.05) and a highly significant (p ＜ 0.01) increase in fecundity was observed in the medium and high batches of BL67 during November - December, 2002 whereas highly significant (p ＜ 0.01) increase was observed in the high batches of 96A during November - December, 2002. Data revealed a highly significant (p ＜ 0.01) increase in fecundity in medium and high batches of both the breeds during January - February, 2003. More interestingly, a significant (p ＜ 0.05) reduction was noted in percentage of non-viable eggs in high batches of 96A during January - February, 2003. But no significant variation in hatchability was noticed due to the effect of differential female pupal weight and male cocoon shell weight.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권2호
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• pp.191-195
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• 2003

The impact of antibiotic (Norfloxacin) administration ,at different concentration (50 ppm and 100 ppm) on commercial characters of bivoltine $({CSR_2}{\times}{CR_4})$ and the cross breed race $({BL_67}{\times}{CSR_101})$ was studied. The result indicated that antibiotic administration with different concentrations significantly improved the rearing and cocoon parameters like larval duration, larval weight, growth index, single cocoon weight, single shell weight and shell ratio. The post cocoon parameters like average filament length, non-breakable filament length, raw silk percentage, raw silk recovery percentage, denier, reelability and neatness were recorded significantly higher in antibiotic treated batches. The better performances of these parameters were recorded with the increase of antibiotic concentration.

• 한국잠사곤충학회지
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• 제36권1호
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• pp.26-29
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• 1994

누에에 유약호르몬 유사물질과 인슐린의 병용처리에 의한 효과를 알아보기 위하여 4령 탈피후 48시간째 methoprene을 처리하고, 5령 탈피후 72시간째 인슐린을 처리하여 시험한 결과 유충기간이 현저하게 길어지고 유충체중, 견사선무게, 전견중, 견층중, 증가하였으며, 발아비율과 산란성이 매우 향상되었다. 그리고 전견중은 암(기호)이 17%, 수(기호)가 20% 향상되었고 견층중은 암(기호)이 18%, 수(기호)가 32% 각각 더 무거워졌다.

• 한국잠사곤충학회지
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• 제10권
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• pp.67-72
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• 1969

In order to analyse the correlation between the parents and their hybrids in the silkworm, which were reared in spring, the author has surveyed the various quantitative characters which are significant in genetics, and the hybrid vigor rate. The duration of larvae life is shorter in F1 Value an in the mid parents value, cocoon size biffer, pupa rate, cocoon crop from ten thousand silkworms just molted in the fourth instar, total cocoon weight and cocoon layer weight increases in comparison with the mid parents value. Although cocoon layer ratio only shows increasing by 0.3％ or so, it is too little to admit the effect. F1 value is nearly equal to parent value and there is no correlation between F1 hybrids value and their mid parents value.

• International Journal of Industrial Entomology and Biomaterials
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• 제4권2호
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• pp.109-115
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• 2002

With the objective of selecting suitable breeding resource material, 10 polyvoltine and 10 bivoltine breeds were drawn from the germplasm collection of Central Sericultural Research and Training Institute, Mysore, and evaluated for 3 seasons comprising one year (6 trials). Data were collected on seven traits of economic importance such as fecundity, pupation rate, cocoon yield, cocoon weight, cocoon shell weight, cocoon shell ratio and filament length, and statistically analysed with two-way classification, Joint scoring method and evaluation index. Significant seasonal variations (P < 0.01) were observed in both polyvoltine and bivoltine breeds. Polyvoltines BL27, BL36 and BL54 and bivoltines CSR2, CSR4 and Daizo scored highest ranking values in all the three methods. Hybridization was initiated based on larval markings and cocoon shapes. Seasonal variations were discussed.