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97.畜試土雞台畜一號近親係數分析

賴永裕 邢湘琳 吳建興 蔡秀容 林德育

行政院農業委員會畜產試驗所

近親土雞台畜一號原係台灣省畜產試驗所於民國七十四至七十五年間，自全省收集體型小、腳脛細與具單冠等特色之有色羽毛種土雞，經特性純化與選育而成，1997年通過臺灣省政府農林廳動植物新品種命名，本研究分析近親土雞台畜一號L7、L9、L11 及 L12 等四個近親品系，自1986年至2011年的近親係數。計L7有12654隻(♂4318隻、♀8336隻)、L9有13280隻(♂4772隻、♀8508隻)、L11有17034隻(♂5712隻、♀11322隻)與L12有13615隻(♂4962隻、♀8653隻)。四個近親品系自1986年至2006年採用一年一世代全同胞配種方式，1987年L7、L9、L11 及 L12近親係數平均與標準差分別為 0.2376±0.0374、0.2320±0.0440、0.2175±0.0550、0.2487±0.0129，2006年升高依序為0.7578±0.0949、0.7088±0.1368、0.6089±0.1275、0.7298±0.0560。從2008年開始為提升產蛋性能，以本族群一年一世代依產蛋性能做選育配種，2008年L7、L9、L11 及 L12近親係數分別為 0.6024±0.1567、0.6122±0.1600、0.4914±0.1584、0.6569±0.1673，至2011年依序為0.5162±0.0093、0.5220±0.0191、0.4439±0.0337、0.2422±0.0448，因非全同胞配種L7、L9與L11品系近親係數皆略降低，以L12品系近親係數之降幅較大。

關鍵語：臺灣土雞、近親配種、近親品系

INBREEDING COEFFICIENTS OF TAIHSU NO. 1 COUNTRY CHICKEN

Y. Y. Lai , S. L. Hsing, C. S. Wu, H. R. Tsai and D. Y. Lin

Livestock Research Institute, Council of Agriculture,

Taihsu No. 1 is a Single crown and slim shank country chicken, collected from several locations of Taiwan and and purified by 1.5 decades, from1985 to 2011. The inbred Native Chicken, Taihsu No. 1 has four lines, L7, L9, L11 and L12, passed nomination of new plant and animal species of Agriculture and Forestry of Taiwan Provincial Government in 1997. Inbreeding coefficients of this study are of the birds from 1986 to 2011 of four lines, L7, L9, L11 and L12. There are 12,654 total of L7 (♂ 4318 birds, ♀ 8336 birds); L9 has 13280 (♂ 4772 birds, ♀ 8508 birds); L11 has 17034 (♂ 5712 birds, ♀ 11322 birds) and L12 are 13615 (♂ 4962 birds, ♀ 8653 birds). The inbreeding selection was one generation per year by full-sib mating practiced from 1986 t0 2006. Inbreeding coefficients of L7, L9, L11 and L12 at 1987 were 0.2376 ± 0.0374,0.2320 ± 0.0440,0.2175 ± 0.0550 and 0.2487 ± 0.0129, which increased to 0.7578 ± 0.0949, 0.7088 ± 0.1368, 0.6089 ± 0.1275 and 0.7298 ± 0.0560 at 2006 . Breeding strategy was changed to enhance the egg production from 2008 which selection enhanced on egg production performance, full-sib mating ignored. Inbreeding coefficients of L7, L9, L11 and L12 were 0.6024 ± 0.1567,0.6122 ± 0.1600,0.4914 ± 0.1584 and 0.6569 ± 0.1673 at 2008 and decreased to 0.5162 ± 0.0093, 0.5220 ± 0.0191, 0.4439 ± 0.0337 and 0.2422 ± 0.0448 at 2011.Results showed inbreeding of L12 decreased most in four lines, however, L7, L9 and L11 decreased slightly.

Key Words: Taiwanese native chicken, Inbreeding, Inbred line