第五十卷(2021)
121. 近親土雞 LRI-L7 品率母雞產蛋性狀遺傳參數估計
林德育(1) 曾淑貞(2) 林慕堯(3) 劉曉龍(1) 賴永裕(1) 朱家德(1) 張秀鑾(3) 吳明哲(1)
(1)行政院農業委員會畜產試驗所 (2)中華醫事科技大學 (3)國立屏束科技大學
本研究旨在估計近親品系土雞 L7 品系母雞產蛋性狀之遺傳參數，並探討產蛋數直接選拔對產蛋相關性能之影響。應用近親土雞台畜一號品系 LRI-L7 族群進行高產蛋數選育，依母雞 16 週齡體重、40 週齡產蛋數（EN40）及種雞受精率與孵化率進行種雞選留與世代更新繁殖。經五個世代選育後，依系譜與相關產蛋性能資料利用 VCE 6.0.2 軟體進行母雞產蛋性狀遺傳參數估計。結果顯示畜試土雞 L7 品系母雞初產日齡（AFE）、初產體重（BWFE）、初產蛋重（EWFE）、40 週齡體重（BW40）、40 週齡平均蛋重（EW40）及 EN40 之遺傳率估值分別為 0.46、0.54、0.20、0.49、0.61 及 0.42﹔EN40 與 AFE 其遺傳負相關（rg = -0.58），EW40 與 BWFE 呈現遺傳正相關（rg = 0.79）、EW40 與 BW40 呈現遺傳正相關（rg = 0.63），BWFE 與 BW40 呈現遺傳正相關（rg = 0.76）。
關鍵語：產蛋性能、遺傳參數、近親土雞
Estimation of genetic parameters for laying production traits in inbred native chicken LRI-L7 strain
D. Y. Lin(1), S. J. Tzeng(2), M. Y. Lin(3), H. L. Liu(1), Y. Y. Lai(1), C. T. Chu(1), H. L. Chang(3) and M. C. Wu(1)
(1)Livestock Research Institute (LRI), Council of Agriculture
(2)Chung Hwa University of Medical Technology
(3)National Pingtung University of Science and Technology
The aims of this study were to estimate the genetic parameters of egg laying traits in native chicken inbred line L7, and to explore the impact of direct selection on laying egg number on laying-related performances. Four traits selection was conducted for five generations based on hen’s 16-week-old body weight, 40-week-old egg number (EN40), fertilization rate, and hatchability. The derivative-free restricted maximum likelihood procedure described by Groeneveld et al. (VCE 6.0, 2010) was used to estimate the variance-covariance components and thus genetic parameters, heritability and correlation. Results showed that the heritability estimates of age (AFE), body weight (BWFE), and egg weight at first egg (EWFE), body weight at 40-week-old (BW40), average egg weight at 40-week-old (EW40), and EN40 were 0.46, 0.54, 0.20, 0.49, 0.61, and 0.42, respectively. AFE was negatively correlated with EN40 (rg = -0.58). However, high positive genetic correlation coefficients were observed between EW40 with BWFE (rg = 0.79) and BW40 (rg = 0.63). Furthermore, the genetic correlation between BWFE and BW40 was high (rg = 0.76). It can be concluded that AFE and BWFE of hen are potential traits, which should be given consideration in implementation of selection programmed for long term selected layer population.
Key Words: Egg production, Genetic parameters, Inbred chicken
  
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