【作者】 蒋亚梅；

【导师】 张元跃；

【作者基本信息】 湖南农业大学 ， 动物遗传育种与繁殖， 2003， 硕士

【摘要】 本研究应用MTDFREML对天心种猪场杜洛克核心群猪的繁殖性状和生长发育性状进行了遗传分析。利用天心种猪场杜洛克猪核心群1997-2001年间255头繁殖母猪的繁殖性能记录和510头后备猪生产性能测定记录，运用多性状动物模型估计主要经济性状的遗传参数和遗传趋势。 分析结果表明：繁殖性状活产仔数（NBA）、初生窝重（LBW）、21d窝仔数（S21）、21d窝重（LW21）、断奶窝重（LW30）、断奶窝仔数（S30）的遗传力分别为0.12、0.12、0.21、0.11、0.10、0.16；生长发育性状60d个体重（W60）、120d体重（W120）、120d体长（BL120）、120d胸围（CG120）、120d臀围（HG120）、120d管围（CL120）、120d体高（WH120）、180d体重（W180）、180d体长（BL180）、180d胸围（CG180）、180d臀围（HG180）、180d管围（CL180）、180d体高（WH180）、日增重（ADG）、背膘厚（BF）的遗传力分别为0.11、0.57、0.43、0.12、0.30、0.71、0.23、0.52、0.53、0.80、0.05、0.47、0.33、0.34、0.31。 繁殖性状NBA、LBW、S21、LW21、LW30、S30的母体遗传效应分别为0.01、0.02、0.05、0.02、0.00、0.03；直接加性效应和母体遗传效应的相关分别为-0.34、-0.49、-0.83、-1.00、-0.11、-1.00；窝效应分别为0.30×10^-3、0.34×10^-4、0.25×10^-3、0.23×10^-3、0.10×10^-7、0.12×10^-2；永久环境效应分别为0.0697、0.1067、0.0057、0.0353、0.0189和0.0105。生长发育性状W60、W120、BL120、CG120、HG120、CL120、WH120、W180、BL180、CG180、HG180、CL180、WH180、ADG、BF的窝效应为0.0212、0.1480、0.0533、0.2055、0.0528、0.1567、0.0750、0.0258、0.2755、0.0520，0.0290、0.0468、0.0514、0.0131、0.0607。 繁殖性状NBA、LBW、S21、LW21、LW30、S30等6个性状两两之间均成正相关，其中NBA与LW21、LW30呈中等正相关，LW21与LW30呈强正相关，其余各性状间呈较强正相关。生长发育性状W120与W180、BF、ADG，W180与BF、ADG，BF与ADG的遗传相关分别为0.68、-0.98、0.90、0.91、0.55、-0.09，120d与180d相应体尺性状的相关，其中CL120与CL180是完全正相关，而AG120与AG180是较弱负相关，其余各性状呈较强正相关。 繁殖性状NBA、LBW、S21、LW21、LW30、S30的遗传趋势在-0.0359-0.0044之间；生长发育性状W120、BL120、HG120、CL120、WH120、W180、BL180、HG180、CL180、WH180、ADG、BF的遗传趋势在-0.2079-0.2622之间。更多还原

【Abstract】 Records on 765 Duroc for repoduction traits and production traits made between 1997 and 2001 in duroc nucleus herd in Tianxin Swine Breeding Center were used to estimate additive genetic(animal),matermal genetic.matermal permanent environmental,common liteer,and residual variance and cocariance.Genetic parameters were estimated using MTDFREML applied to a multivariate individual animal model with fixed effects of herd-year-season-parity or herd-year-season-sex and random effects of animal(additive direct genetic),additive maternal genetic,maternal permanent environmental,common litter.and residual.The genetic trends of the main economic traits were analyzed.The studied main economic traits included number of piglets born alive(NBA),litter weight born(LBW),number of piglets at 21d(S21),litter weight at 21d(LW21),litter weight at weaning(LW30),number of piglets at weaning(S30),weight of 60d(W60),weight of 120dW120),body length of 120d(BL120),chest girth of 120d(CG120),adominal girth of 120 d(AG120),hip girth of 120d(HGl20),circumference of leg of 120d(CL120), withers height of 120 d(WH120), weight of 180d(W180),body length of 180d(BL180),chest girth of 180d(CGl80),adominal girth of 180d(AG180),hip girth of 180d(HG 180), circumference of leg of 180 d(CL180),withers height of 180d(WH180),average daily gain(ADG),backfat depth adjusted to 180d(BF).Heritabilities for NBA, LBW, S21, LW21, LW30, S30, W60, W120, BL120, CG120, HG120,CL120,WH120,W180,BL180,CG180,HG180,CL180,WH180,ADG and BF were . 0. 12,0. 12,0.2 1,0. 1 1,0. 10,0. 16,0. 1 1,0.57,0.43,0. 12,0.30,0.71,0.23,0.52,0.53,0.80,0.05,0.47,0. 33, 0 .34,03 1, respectively.Additive maternal genetic effects were 0.01,0.02,0.05,0.02,0.00 and 0.03 for NBA, LBW,S21,LW21,LW30,S30;correlation between additive direct genetic and additive maternal genetic effect were -0.34,-0.49,-0.83,-1.00,-0.11,-1.00,respevtively.maternal permanent environmental effects were 0.0697, 0.1067, 0.0057, 0.0353, 0.0189, 0.0105; Common litter environment effects were 0.30× 10-3, 0.34×10-4, 0.25×10-3 , 0.23×10-3, 0.10×10-7,0.12×10-2,0.0212,0.1480,0.0533,0.2055,0.0528,0.1567,0.075,0.0258,0.2755,0.05 20,0.0290,0.0468,0.0514,0.0131,0.0608 for NBA, LBW, S21, LW21, LW30, S30, W60, W120,BL120,CG120,HG120,CL120,WH120,W180,BL180,CG180,HG180,CL180,WH180 ,ADG,BF.Genetic correlations for NBA/LEW, NBA/LW21, NBA/LW30, LBW/LW21, LBW/ LW30,W180/BF,W180/ADG,ADG/BF,BL120/BL180,HG120/HG180,WH120AVH180 were0.82,0.42,0.39,0.81,0.76,0.91,0.55,-0.09,0.43J0.76,0.66,respectively.Genetic trends (97-0 l)of reproductive traits were dispostive,Genetic trends are 0.0044,-0.0055,-0.0126,-0.0359,-0.0088forNBA,LBW,LW21,LW30,S30,respectively.Genetic trends of the productive traits respectively are 0.0122,0.0687,0.2622,-0.0067 for W120,W180,ADG,BF,respectively.更多还原