• 제목/요약/키워드: Local hybrids

검색결과 26건 처리시간 0.028초

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.

Some Nutritional Studies on Some Bulgarian Silkworm (Bombyx mori L.) Hybrids Reared in Northern Greece

  • Kipriotis, Evripidis;Grekov, Dimitar
    • International Journal of Industrial Entomology and Biomaterials
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    • 제1권2호
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    • pp.155-159
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    • 2000
  • In the spring silkworm rearing period of year 1998, some nutritional aspects were studied in the Agricultural Research Station of the Komotini town in Greece, to investigate the feeding behaviour of some Bulgarian silkworm hybrids, suitable for spring rearing, during the fourth and fifth instal under the local climatic conditions. The silkworms were fed by locally cultivated Japanese Kinriu mulberry (Morus alba L.) variety leaves. Eight Bulgarian hybrids had been used, namely Vratza-53xVratza-52, Ukraine-20xVratza-53, Super 1xHessa 2, Merefa 2xVratza 35, as well as their reciprocal crosses. The studies showed out a remarkably higher feed intake and feed utilization by the hybrids Hessa 2xSuper-1, Merefa 2xVratza 35 and Vratza-52xVratza-53. The same hybrids showed an efficient food utilization by means of daily growths cocoon shell ratio and raw silk output. In terms of food to silk conversion efficiency Hessa 2xSuper-1 hybrid gave the best results. Larval stage duration for fourth and fifth instar was not affected by feed intake and utilization. All hybrids showed a good adaptation to the local environment and their feeding performance was equal to the international existing standards. All calculated parameters were found to be around the mean values of other up to date presented results and thus considered as acceptable for the needs of the local production.

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재래종과 Orient종 연초 $F_1$의 잡종강세와 조합능력 (Heterosis and Combining Ability in $F_1$ Hybrids of Korea Local and Oriental Tobacco Varieties (Nicotiana tabacum L.))

  • 이정덕;장권열
    • 한국연초학회지
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    • 제6권1호
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    • pp.3-11
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    • 1984
  • In order to obtain the basic information for the successful breeding of aromatic tobacco (Nicotiana tabacum L.), the heterosis, combining ability and gene distributions in 28 Fl hybrids by diallel crosses between Korea local and Oriental varieties were investigated. The yield were higher, stalk height, leaf length and leaf width were larger and days to flower was shorter for the Fl hybrids when compared to mid-parent. Estimates of general combining ability were significant for all characters investigated, and specific combining ability were significant for yield, stalk height, leaves Per Plant, leaf width and days to flower. In vr-wr graph, partial dominane was exhibited by all characters investigated.

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Evaluation and Identification of Promising Bivoltine Hybrids of Silk-worm, Bombyx mori L., for Tropics

  • Rao, P.Sudhakara;Singh, Ravindra;Kalpana, G.V.;Naik, V.Nishitha;Basavaraja, H.K.;Swamy, G.N.Rama;Datta, R.K.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제3권1호
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    • pp.31-35
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    • 2001
  • Ten newly evolved bivoltine hybrids of silkworm (Bombyx mori L) were evaluated with control hybrid KA${\pm}$NB4D2 during three seasons of a year for their seasonal performance. Analysis of variance and other statistical methods were employed and the performance was observed in respect of 10 quantitative traits. The results showed significant genotype${\pm}$environment interaction with respect to four quantitative characters viz. fecundity, yield/10,000 larvae, filament length and raw silk (%). Environmental effects were significant for nine characters out of ten characters evaluated. A 105${\pm}$J2 and B${\pm}$NB4D2 were considered as highly adaptable hybrids to local conditions with high mean for maximum characters studied and found suitable to rear in all seasons.

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Evaluation of New Commercial $F_1$ Hybrids of Silkworm (Bombyx mori L.) with Participation of Sex-limited Lines

  • Petkov, N.;Petkov, Z.;Grekov, D.;Arnaudova, K.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제9권1호
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    • pp.47-51
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    • 2004
  • To evolve silkworm hybrids with higher survival and productivity and easy and effective seed cocoon production, three new evolved bivoltine hybrids of silkworm (Bombyx mori L.), created with participation of sex-limited lines at eggs and larva stage were evaluated with control Super$_1$${\times}$Hessa$_2$ hybrid at Plovdiv Agrarian University during 2000 - 2002. ANOVA analysis was employed and the performance of hybrids was observed in respect of main quantitative traits. The results obtained show significant superiority of new hybrids T$_{15}$ 4/${\times}$TBV$_{2}$24/, XT$_{215}$38/${\times}$TV$_{3}$2/, XT$_{215}$38/${\times}$B$_{2}$6/ and their reciprocal crosses over the control. They were characterized with 99% hatchability of eggs, 93-95% silkworm survival, 2.32- 2.42 g cocoon weight, 53.5-55.7 cg shell weight, 22.9-23.1% shell ratio, 1,307-1,326 m filament length, 3.08-3.17 denier, 95-96% reelability, 44.4-45.1% silk ratio, 569-593 number of normal eggs per lying and 347-364 mg weight of normal eggs per lying. Newly evolved hybrids were manifested high productivity, 41.0-43.6 kg cocoon yield and 7.33-7.78 kg raw silk yield per one box (20,000$\pm$200 viable eggs), which significant surpass the control Super$_1$${\times}$Hessa$_2$ hybrid with 7.6-14.4% and 10.8-17.6%, respectively. T$_{15}$ 4/${\times}$TBV$_{2}$24/ and XT$_{215}$38/${\times}$TV$_{3}$2/ were considered as highly productive hybrids to local conditions and found suitable to rear in spring season.n.

교잡종 찰옥수수에 대한 연구 -I. 찰옥수수 "연농×재래" 교잡종의 생육 및 수량특성 (Study on Waxy Hybrid Using Korean Local Maize Lines -I. Growth and Yield Characteristics in Waxy Maize Hybrid Yeonnong × Jaerae)

  • 이희봉;정재영;최현구;김기훈;김효기;주정일
    • 농업과학연구
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    • 제28권2호
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    • pp.65-69
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    • 2001
  • 재래종 찰옥수수 $F_1$ 교잡종에 대한 생육 및 수량비교를 위해 충남대학교 농과대학 실험포장에서 육성한 이들 교잡종의 식물학적 특성에 대한 연구 결과는 다음과 같다. 1. 간장은 대조구에 비해 대학찰${\times}$재래찰, $FR805/1K_3{\times}$고령찰이 가장 크게 나타났으나, $FR805/1K_3{\times}$대학찰, 찰옥 1호에서 대조구와 비슷하게 나타내었다. 2 착수수는 간장에서와 마찬가지로 대학찰${\times}$재래찰, $FR805/1K_3{\times}$고령찰이 대조구보다 높게 나타났으나 대학찰${\times}$재래찰, 찰옥 1호는 비슷하였다. 3. 분얼수는 각 교잡종들간에 큰 차이가 없었다. 4. 이삭의 길이는 대조구에 비해 교잡종들이 거의 2배이상의 크기를 나타내었다. 5. 이삭직경은 $FR805/1K_3{\times}$고령찰의 교잡종을 제외하고 대조구와 비슷하게 나타났다. 6. 이삭얼수는 $Daelrakchal{\times}1K_1/LE$만이 대조구와 유의성을 나타내고 기타 교잡종은 대조구와 비슷하였다.

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Breeding of Bivoltine Silkworm Hybrids DP0308 and DP0314 in Sri Lanka : A Simplified but Practical Approach

  • Lea, Ho-Zoo
    • 한국잠사곤충학회지
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    • 제40권2호
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    • pp.97-104
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    • 1998
  • Mainly due to limited genetic resources available and also urgent need for hybrids suitable to local conditions, conventional theories and regular methods for bivoltine silkworm breeding are not easily applicable in such a tropical country as Sri Lanka which is recently planning to scale-up the silk industry. A simplified but practical methodology was introduced to overcome such constraints. Through application of such modified informal breeding methods, two hybrids named DP0308 and DP0314 were selected for cocoon production. Details of the altered method of germplasm improvement in the silkworm are presented, along with combining ability and heritability estimates for six parental pure lines in a half-diallel cross.

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Modifications of heterobeltiosis, heterosis, and hybrid vigour over check parent formulae to enhance judgment on hybrids

  • Ghazy, Usama M.;Fouad, Tahia A.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제42권2호
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    • pp.33-45
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    • 2021
  • Many researchers are using the heterosis, heterobeltiosis and hybrid vigour over check parent value formulae to determine the hybrid vigour for animals, plants and silkworm breeding. These formulae are ideal for determine the hybrid vigour for the positive direction of single trait. It is difficult using these formulae for multiple traits. Suggested modification for cardinal formulae were made as well as suggestion new formula for determines hybrid vigour for multiple traits. Modifications of hybrid vigour were made to facilitate judgment of best hybrids under study for multiple traits. Nineteen local hybrids of mulberry silkworm were prepared for these investigations in addition the imported Bulgarian hybrid. Comparison between the cardinal and the modifications formulae were applied for thirteen economic characters. Nine positive and four negative direction characters were observed. Modified formulae make the judgment of heterobeltiosis, heterosis and hybrid vigour over check parent value very facilitate for positive and negative traits.

Studies on the Manifestation of Hybrid vigour and Combining Ability in Polyvoltine X Bivoltine (cross breed) Hybrids of Mulberry Silkworm Bombyx mori L.

  • Seshagiri, S.V.;Naik, S. Sankar;Seetharamulu, J.;Goel, A.K.;Raju, P.J.
    • International Journal of Industrial Entomology and Biomaterials
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    • 제24권1호
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    • pp.7-16
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    • 2012
  • To meet the local requirement i.e. the tropical stress of Andhra Pradesh and marginal farmers, twenty four new hybrid combinations were tested in Line x Tester method involving eight newly developed polyvoltine oval lines viz., MSO1, MSO2, MSO3, MSO4, MSO5, MSO6, MSO7 and MSO8 and three bivoltine silkworm breeds viz., APS12, APS45 and APS8 as testers. These hybrids were reared to evaluate their performance. Data for eight economically important metric traits viz., fecundity, cocoon yield per 10,000 larvae by number, cocoon yield per 10,000 larvae by weight, survival rate, cocoon weight, cocoon shell weight, cocoon shell ratio and filament length was recorded. General combining ability (gca), specific combining ability (sca) and heterosis were analyzed. Further, the relative merit of the hybrids for all the traits under study was also assessed adopting Evaluation Index method. Based on combining ability effects, heterosis and evaluation index, five hybrid combinations viz., MSO3 $\times$ APS45, MSO1 $\times$ APS12, MSO7 $\times$ APS8, MSO2 $\times$ APS45 and MSO1 $\times$ APS45 were selected for further evaluation in different seasons.

주요 재래종 찰옥수수 자식계통과 교잡종들의 특성 및 조합능력 (Characteristics and Combining Ability of Korean Local Waxy Maize lnbreds and Hybrids)

  • 이원구;최봉호
    • 한국작물학회지
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    • 제40권2호
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    • pp.175-184
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    • 1995
  • 6개 자식계통 찰옥수수에 의한 이면교배 조합(역교배 불포함)에 대하여 식물학적 특성과 이삭 관련 특성들에 대하여 조사한 것을 요약하면 다음과 같다. 1. 6개 자식계통들의 개화기, 간장, 착수고, 엽면적 및 수경의 길이는 각 계통들 간에 차이가 있었다. 특히 보성 계통의 수경길이가 24.4cm였는데 반하여 칠보 계통은 9cm에 불과하였다. 2. 6개 자식계통들의 이삭길이, 이삭직경, 100립중, 이삭속길이, 열수 및 이삭당 립수 등 역시 계통간에 큰 차이가 있었다. 특히 보성 계통은 이삭 길이가 13.4cm로 계통 중 가장 컸으나 이삭 직경과 열수와 이삭당 총 당수가 가장 낮았으며, 100립종은 가장 무거웠다. 반면 당진 계통은 이삭 길이가 9.3cm로 짧은 대신에 이삭직경이 크고, 또 열수도 비교적 많아 이삭당 당수가 282개로 가장 많았다. 3. 자식계통들의 10a당 곡실 수량을 보면 분얼을 하고 다수성인 제원 계통이 285kg으로 가장 많았다. 4. 15개 교잡종들이 자식계통 특성 가운데 개화기, 간장, 착수고, 엽면적 등은 교배조합에 따라 큰 차이를 보였다. 5. 15개 교잡종들의 이삭관련 특성을 보면 보성 계통을 양친으로 한 조합들은 이삭길이가 길었고 100립종도 무거웠다. 반면에 당진 계통의 교잡종들은 이삭길이가 짧았다. 6.풋옥수수 수량이 높았던 것은 보성 계통과 교배된 조합들 이었으나, 곡실수량에서는 당진과 교배된 조합들이었다. 7. 당진계통의 일반조합능력은 교잡종의 간장과 착수고를 낮게 하는데 효과적이었다. 8. 제원계통은 교잡종들의 분얼수를 증가시키는 방향으로 일반조합능력이 컸다. 9. 이삭의 길이, 100립종, 열수 등 이삭 관련 형질에 대한 일반조합능력 효과는 보성 계통이 컸고, 종실 수량에 대한 일반조합능력이 컸던 계통은 제원과 단양 계통이었다. 10. 이삭의 길이, 100립종 등에 대한 특수능력이 컸던 조합은 제원/칠보조합이었고, 종실 수량에 대한 특수조합능력이 컸던 계통은 보성/당진이었다.

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