Browse > Article
http://dx.doi.org/10.7852/jses.2015.53.1.12

Comparison of F1 and F2 hybrid on authorized silkworm variety  

Kim, Kee-Young (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Kim, Mi-Ja (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Ji, Sang-Duk (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Kim, Nam-Suk (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Kim, Yong-Soon (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Sung, Gyoo-Byung (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Park, Kwang-Young (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Kang, Pil-Don (Department of Agricultural Biology, National Academy of Agricultural Science, Rural Development Administration)
Publication Information
Journal of Sericultural and Entomological Science / v.53, no.1, 2015 , pp. 12-18 More about this Journal
Abstract
This study was conducted to consider practical use of F2 hybrid and intervariety crossing for the improvement of silkworm eggs export and silkworm eggs manufacture. Now Kumokjam and Baegokjam come into wide use to sericulture farmers but comparison test of F1, F2 hybrid and intervariety have not been done. We weighed against the productivity among economical character. While larval period of F2 among them is most long time, pupation percentage and cocoon yield per 10,000 3rd molted larvae are lower than intervariety. With comparing F2 and intervariety, single cocoon weight of F2 is lower 9 ~ 21% than intervariety, and cocoon shell weight of F2 was lower 10 ~ 18% than intervariety. By number of cocoons per liter, F2 hybrid was lower and more irregular size than intervariety. In coparison with number of egg laid, F2 hybrid Baegokjam was 655 ea (14%) and Kumokjam 625 ea (40%) more than F1 hybrid. Also, F2 hybrid for filament grade went down than F1 hybrid. The advantage of egg production in F2 hybrid can reduce costs because there is no necessity for sex discrimination and germination control. But besides increase of number of egg laid, the productivity including economical characters was greatly lowered. Except for being a lot of laying eggs, cocoon productivity of the F2 was greatly reduced by degeneration of practical traits. Therefore the further studies are needed in order to increase utilization value of the F2 hybrid silkworm.
Keywords
Silkworm; Breeding; F1; F2; Hybrid;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Hong KW, Ryu KS, Hwang SJ, Shon BH, Kang PD, Seol KY, Lee SP, Kim KM (1996) Breeding of Kumokjam, an artificial diet adaptable silkworm variety, for spring rearing season. Res Rept RDA 38, 801-805.
2 Jeong WB (1990) Studies on heterosis, selective Index, genetic advance and selective efficiency for some characters in silkworm breeding. Korean J Seric Sci 32, 8-16.
3 Jeong WB, Chang KY (1989) Degrees of heterosis and inbreeding depression of quantitative chatacters in silkworm by diallel crosses. Korean J Seric Sci 31, 20-24.
4 Kawabata, Otachi (1982) Comparison test of the F1 and F2 of two or three current varieties and old varieties. Sericulture research 121, 63-75.
5 Lee SP, Hong KW, Sohn KW, Mah YI, Kim KY (1984) Breeding of new silkworm variety "Baegokjam". Res Rept RDA 26, 58-64.
6 Moon BW, Han KS (1994) The test of combining ability and heterosis on the silkworm(Bombyx mori) breeding. Korean J Seric Sci 36, 8-25.
7 RDA (2010) Guideline for sericultural experiment
8 Shon BH, Jeong WB (1992) Analysis of gene for major quantitative characters in silkworm, Bombyx mori. Korean J Seric Sci 34, 21-29.
9 Toyama (1906) $^{\circ}{\times}$Studies on the hybridology of insects. I. On some silk-worm crosses, with special reference to Mendel's law of heredity$^{\circ}{\pm}$, Bulletin of College of Agriculture, Tokyo Imperial University 7, 259-393.
10 Yokoyama T (1973) Studies on the improvement in the efficiency of egg production by means of polyhybridization. Reports of the Silk Science Research Institute 22, 6-35.