黄羽肉鸡IMF选择与遗传参数估计  

Selection Response and Estimation of the Genetic Parameters for Intramuscular Fat in a Quality Chicken Line

作　　者：赵桂苹[1] 文杰[1] 陈继兰[1] 郑麦青[1] 李小华[1] 

机构地区：[1]中国农业科学院北京畜牧兽医研究所,北京100094

出　　处：《畜牧兽医学报》2006年第9期870-873,共4页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金："十五"国家科技攻关项目(2002BA514A-9)资助

摘　　要：利用家系选择的方法，对黄羽肉鸡90日龄胸肌肌内脂肪含量（IMF）进行了4个世代的选择；采用动物模型（样本数N=632～1084）和MTDFREML软件对部分肉质性状进行了遗传力（h^2）和遗传相关（r）估计。试验结果表明：经过4个世代的选择，G4代比G0代IMF含量提高了17．8％（P〈0．01），变异系数由29．59％降低到21．72％。胸肌IMF含量的估计遗传力h^2=0．220，4个世代的平均实现遗传力h^2=0．322，初步说明IMF含量为中等遗传力性状，可以通过选择提高。腹脂重、腹脂率、脂带宽、皮脂厚、冠高、冠厚、90日龄体重等性状的遗传力在0．08～0．54范围内，胸肌IMF、腿肌IMF与腹脂重等性状间呈遗传正相关。Selection response and genetic parameters for intramuscular fat （IMF） of breast muscle on 90 days were studied by analyzing the data from a selection experiment in a quality chicken line. Data had been collected over 4 generations （G0-G4） of selection. Genetic parameters of meat quality trait were estimated using MTDFREML software with animal model （N = 632- 1 084）. From GO to G4,the average IMF of chickens showed a continuing increase ,the mean of phenotypic value in GO and G4 were 3.25 ± 0.96 % and 3.83 ± 0.83 % respectively. The coefficient of variation （C. V. ） of GO and G4 were 29.59G and 21.72G respectively. The estimated heritability and realized heritability （mean of 4 generations） of IMF was 0. 220 and 0. 322 respectively. A positive genetic correlation was observed between IMF of breast muscle and IMF of leg muscle, abdominal fat weight, abdominal fat percentage, width of fat strip, thickness of caudal skin and fat, thickness of comb, highness of comb and bodyweight of 90 days. The selection experiment demonstrated that IMF trait could be increased with selection through line-breeding.

关 键 词：黄羽肉鸡 肌内脂肪(IMF) 家系选择 遗传力 遗传相关 

分 类 号：S831.2[农业科学—畜牧学]