• 제목/요약/키워드: cocoon-weight

검색결과 202건 처리시간 0.028초

화상처리장치에 의한 번데기 암수판별의 효과 (Sex-Discrimination of Silkworm Pupa, Bombyx mori with Image Analyzer)

  • 유강선
    • 한국잠사곤충학회지
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    • 제35권2호
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    • pp.105-113
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    • 1993
  • 누에의 실용품종은 모두 일대교잡종을 이용하고 있어 교잡종제조과정에는 씨고치의 암수감별이 필수적인 작업과정이다. 번데기의 암수감별 수단으로는 번데기의 비중, 번데기 무게, 고치무게 등에 의해 많은 연구가 되어 왔지만 아직 미흡한 점이 많아 본 시험에서는 화상처리장치에 의한 고치모양과 고치무게 등에 의하여 여러가지 조합으로 번데기 암수판별 효과를 분석한 결과는 다음과 같다. 1. 측정된 데이터의 암수간 차의 평균에 있어서는 번데기무게, 견층종, 장경, 단경, 면적, 체적, 전견중, 장폭비율 등은 암이 크지만, 견층비율만은 수가 높게 나타났다. 2. 조사변량 단독에 의한 암수판별효과는 번데기 무게, 전견중, 견층비율, 체적, 면적, 견층중, 단경, 장경 순이었으며, 암수판별정도는 번데기무게가 97%, 전견중 96%로 매우 높게 나타났다. 3. 고치모양에 관계되는 변수만에 의한 암수판별효과는 품종에 따라서는 84%의 암수분리효율을 보였으나 전체평균 78%로 매우 저조하였다. 4. 번데기무게, 견층중, 전견중 및 견충비율에 의한 암수판별효율은 약 99%로 매우 높았으나 누에고치를 절개해야하는 문제가 남아있다. 5. 견종과 고치모양에 의한 시험에서는 전체평균 판별율이 98.7%로 견중에 관계하는 변수에 의한 것 보다는 판별정도가 낮지만, 전견중의 단독변수에 의한 것보다는 2.7%가 향상되었다. 6. 판별함수를 설정하는데에 최소유효샘플링수는 암수 각 15개씩 이상이면 충분한 것으로 분석되었다.

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Influence of Thyroxine on the Economic Parameters of the Bivoltine Silkworm, Bombyx Mori L.

  • Hugar, I.I.;Kaliwal, B.B.
    • 한국잠사곤충학회지
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    • 제38권2호
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    • pp.130-137
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    • 1996
  • Thyroxine을 5, 10, 15$\mu$g/ml의 수준으로 이화성 누에 NB18 품종의 유충에 도말처리한 결과 유충, 견사선, 고치, 고치층 등의 무게가 증가되고 유충경과 일수는 단축되는 등, 누에의 실용형질이 개선됨을 확인하였다. 이러한 결과는 전반적으로 10-15$\mu$g/ml의 thyroxine 처리구에서 얻어졌고 5$\mu$g/ml처리구는 대조구와 유의차를 보이지 않았다. 화아율과 부화율은 thyroxine처리의 영향을 받지 않았고 유충경과일수는 단축되었다.

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The Effect of Mineral Salts, Magnesium Sulphate and Potassium Nitrate on the Economic Parameters of Silkworm Bombyx mori L.

  • Goudar, K.S.;Kaliwal, B.B.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제3권1호
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    • pp.69-73
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    • 2001
  • The effect of topical application 100,300 and 500 $\mu$g/ ml with Mineral Salts of magnesium sulphate and potassium nitrate on economic parameters was ana- lyzed following treatment of last larval stadium. The treated larvae showed significantly decreased larval weight and silk gland weight in all the treated groups along with other decreased Iarval, cocoon and adult parameters. The female cocoon weight was significantly decreased in all the treated groups with decreased female cocoon shell weight and male cocoon weight at 300 and 500$\mu$g/ml respectively. The length and weight of filament was significantly decreased at 300 and 500 $\mu$g/ml respectively and denier at 500 $\mu$g/ ml. The fecundity decreased significantly in 300 and 500 $\mu$g/ml treated groups when compared with the corresponding parameters of the carrier control.

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이면교잡에 의한 가잠 F1세대의 몇 가지 양적 형질에 관한 유전 분석 (Genetic Analysis by Diallel Crosses in F1 Generation of Silkworm, Bombyx mori)

  • 정원복;장권열
    • 한국잠사곤충학회지
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    • 제28권1호
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    • pp.24-29
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    • 1986
  • 가잠에 있어서 잡종세대의 우수한 계통을 생산할 수 있는 교배친의 선정과 교배친의 잡종세대의 유전 현상에 대한 기초 정보를 얻고자 7개 품종을 이면교잡하고 이를 F1세대에 대하여 유전자의 분포상태 및 우성 정도, 그리고 조합능력 등을 검정한 결과는 다음과 같다. 1. Vr-Wr graph 및 분산성분에서 단견종은 우성효과가 큰 초우성으로, 단층종과 단층비율은 상가적 효과가 큰 불완전우성으로 각각 추정되었다. 2. 조합능력은 전형질에서 유의적으로 작용하였고 일반조합능력이 특정조합능력보다 크게 평가되었다. 3. 조합능력의 효과 중 GCA 효과는 잠 107이 전 형질에서 가장 높았고, SCA 효과는 잠 113$\times$ 중 14의 조합이, 잠 107$\times$중 14의 조합이 크게 평가되어 주로 중 14가 교배부체일 때에 조합능력이 컸었다.

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이면교잡에 의한 잠체형질의 유전분석 I. 잠체의 양적 형질에 관여하는 유전자의 우성정도와 분포상태 (Genetic Studies on Some Silkworm Characters by the Diallel Cross I. Degrees of Dominances and Gene Distributions)

  • 장권열;한경수;민병열
    • 한국잠사곤충학회지
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    • 제21권2호
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    • pp.1-6
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    • 1979
  • 잠체의 몇가지 양적형질에 관여하는 유전자의 우성정도, 유전력, 유전자의 분포상태등을 알기 위하여 누에의 6개 품종을 교배친으로 하여 이면교잡을 한 F$_1$세대와 교배친품종을 재료로 유전분석을 한바 그 결과를 요약하면 다음과 같다. 1. 각 형질의 측정치는 품종과 조합에 따라서 다르고 특히 전견양과 견층양은 자잠이 웅잠보다 많고, 견층비율은 자잠보다 웅잠이 크게 나타났다. 2. 각 형질별 분산성분중 상가적효과에 의한 분산D보다 Herterosis등에 의한 분산 H가 크며 우성정도가 모두 1이상으로 나타났으므로 품종 자체가 hetero상태라는 것을 알 수 있었다. 3. 광의의 유전력은 모두 높았으나 협의의 유전력이 비교적 높은 형질은 전령경과일수, 5영경과일수, 견층비율의 3개형질이었다. 4. 유전자의 분포상태를 보면 전령경과일수, 5영경과일수, 견층비율의 3개형질은 불완전우성으로, 전견양과 견층양의 2개형질은 초우성으로 나타났다. 5. 전령경과일수와 5영경과일수에 관여하는 유전자는 B(112)품종에 우성유변자가 많고, A(111)품종이나 E(경추)품종에 열성 유전자가 많이 관여하고 있는 것으로 보인다. 견층비율에는 자웅에 따라서, 품종에 따라서 우성 또는 열성유전자가 관여하는 정도가 다르며 전견양과 견층양의 2개형질은 초우성으로 나타나고, F(연일) 품종과 E(경추) 품종에 우성유전자가 많이 관여하고 B(112)품종과 A(111)품종에 열성유전자가 많이 관여하고 있는 것으로 보인다. 이상의 결과를 미루어 보아 전견양과 견층양을 증가시키기 위한 교배친으로서는 F(연일) 품종이 제일 좋고 다음으로 E(경추)품종이 유리할 것으로 사료된다.

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Study on Inheritance and Transgressions at Cocoon and Shell Weight Characters between Genetically Sex-limited Silkworm Bombyx mori L. Lines

  • Petkov N.;Petkov Z.;Grekov D.;Arnaudova K.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제11권1호
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    • pp.75-78
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    • 2005
  • Inheritance of cocoon and shell weight characters in silkworm crosses between sex-limited at larva stage lines, including three (NIG$_{1}$ $\times$ TV$_{3/2}$ ,NIG$_{1}$ $\times$ TBV$_{2/24}$ and NIG$_{1}$ $\times$ B$_{2/6}$ ) from Japanese type and three (NIG$_{2}$ $\times$ B$_{2/6}$ ,TV$_{3/2}$ $\times$ NIG$_{1}$ and NIG$_{2}$ $\times$ TBV$_{2/24}$ ) from Chinese type was studied at Regional Centre for Scientific­Applied Service - Vratza during the period of 2000 ­2002. Inheritance of tested characters in F I was deter­mined through genetic parameters, additiveness (a), dominance (d) and their ratio (d/a). Degree and frequency of transgressions in F$_{2}$ were calculated also. Over dominance (d/a(>) 1) with bigger contribution of the parent with higher value was determined at inheritance tested characters. Transgressions obtained at cocoon and shell weight characters were positive and varied in wide limits. The productivity of parent's lines had defined the variability of genetic parameters for degree and frequency of transgressions. Combination of positive transgressions at cocoon and shell weight characters in F2 hybrid populations from sex-limited at larva stage allow us to select individuals with high productive potential for further use in selection programs.

Manifestation of Hybrid Vigour and Combining Ability in Polyvoltine $\times$ Bivoltine Hybrids of Silkworm, Bombyx mori L.

  • Rao, D.Raghavendra;Singh, Ravindra;Premalatha, V.;Kariappa, B.K.;Rekha, M.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제4권1호
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    • pp.23-30
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    • 2002
  • The general and specific combining abilities and hybrid vigour of seven polyvoltine breeds [BL24, BL62, BL6S, BL67, BL68, BL69, and Pure Mysore (PM)] with five bivoltine breeds (NB4D2, CSR2, CSR5, CSR18 and CSR19) were evaluated in a line ${times}$ tester design by analysing six quantitative traits viz., fecundity, yield 110,000 larvae both by number and weight, cocoon weight, shell weight and cocoon shell ratio. ANOVA estimates showed significant effects for all the traits indicating the role of both additive and non- additive gene actions. Estimation of GCA revealed that the breed BL67 exhibited significant positive effects toy all the six traits followed by BL68 for four important economic traits viz., fecundity, cocoon weight, shell weight and cocoon shell ratio. Among testers, CSR5 showed significant GCA effects for five traits whereas CSR2 exhibited for shell weight and shell ratio. Three hybrids viz., BL67${times}$ NB4D2, BL67 ${times}$CSR5 and BL67${times}$ CSR19 excelled in four quantitative traits for SCA. Majority of the hybrids expressed positive hybrid vigour for cocoon yield/10,000 larvae by weight, cocoon weight and shell weight. Four hybrids namely PM ${times}$ NB4D2, BL67 ${times}$NB4D2, BL67${times}$ CSR5 and BL67${times}$ CSR19 manifesting positive hybrid vigour for five economic traits were adjudicated as best Heterotic hybrids and recommended for commercial exploitation to increase the silk yield.

Estimation of Hybrid Vigor of Some Egyptian Single Local Hybrids of Mulberry Silkworm, Bombyx mori L.

  • Ghazy, Usama Mohamed Mohamed
    • International Journal of Industrial Entomology and Biomaterials
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    • 제25권2호
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    • pp.147-151
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    • 2012
  • Fifteen races resulted from silkworm breeding program at Sericulture Research Department (SRD) were used for hybridization. Fourteen hybrids were obtained and coded as; Giza C, D, R, S, T, U, A, V, W, P, H, L and Qanater 1, 2. The traits of cocoon weight, cocoon shell weight, pupal weight, cocoon shell ratio, silk productivity, fifth instar duration, total larval duration, number of cocoon per liter and pupation ratio were evaluated. Data were analyzed by using three formulae of heterosis over better, mid and check parent values. Hybrids of Giza V, C, N, Qanater 1 and 2 are promising and could be used in commercial cocoon production. Generally, there are some new hybrids can be exploited in commercial scale. Also, the local races can be evolved using the hybridization, inbreeding and selection program.

Manifestation of Hybrid Vigour and Cocoon Shape Variability in Fl Hybrids of the Mulberry Silkworm, Bombyx mori L.

  • Singh, Ravindra;Rao, D.Raghavendra;Premalatha, V.;Mondal, Sipra;Kariappa, B.K.;Jayaswal, K.P.;Datta, R.K.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제2권2호
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    • pp.133-139
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    • 2001
  • Data from an experiment involving six polyvoltine and three bivoltine silkworm breeds have been analysed to know the level of hybrid rigour and cocoon shape variation in Fl hybrids among silkworm breeds with lows medium and high cocoon weight. Results indicated significantly positive heterosis for several quantitative characters with maximum total heterosis over mid parent value in hybrids between low and medium followed by low and low, medium and medium, low and high and high and low cocoon-weighed breeds, respectively. Study on cocoon shape measurement revelled that among Fl hybrids, cocoons of the three combinations such as GNP ${\times}$ CSR2, GNP ${\times}$ J2 and PM ${\times}$ NB4 D2 were comparatively uniform in their cocoon shape. Importance of this study to know the level of heterosis and cocoon shape variability in different silkworm crosses hale been discussed.

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누에 품종별 누에나방의 수명과 실용형질 (General Characteristics and Life Span of Silkworm Moth According to Varieties, Bombyx mori.)

  • 강필돈;류강선;김계명;손봉희;촌상소웅;손흥대
    • 한국잠사곤충학회지
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    • 제41권3호
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    • pp.154-166
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    • 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.

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