大约克猪不同模型的遗传参数估计与遗传趋势分析

发布时间：2018-04-13 19:40

本文选题：遗传力 + 遗传相关系数　；参考：《华中农业大学》2017年硕士论文

【摘要】：本研究以福建地区某国家核心育种场2010年到2016年出生的大约克猪为材料。运用非求导最大似然法(Derivative-Free Restricted Maximum Likelihood)和最佳线性无偏预测法(Best linear Unbiased Prediction)对不同遗传参数模型进行研究,估计了100kg体重日龄和背膘、总产仔数、产活仔数以及初生窝重的遗传参数,并对表型趋势与遗传趋势进行了分析。研究结果如下:(1)在2010年到2016年间大约克猪100kg体重日龄在逐步减小,100kg体重背膘厚则处于平稳波动中;性别分析中公畜的100kg体重日龄与100kg体重背膘厚低于母畜;胎次分析中第1胎与第11胎的总产仔数和产活仔数最低,从第2胎开始总产仔数和产活仔数逐步提升,在第五胎时产仔数达到最高。(2)100kg体重日龄和100kg体重背膘厚的个体直接加性遗传力、母体直接加性遗传力、个体和母体直接加性相关系数分别为0.24696、0.02074、-0.04522;0.58055、0.07667、-0.14974。总产仔数、产活仔数和初生窝重的个体直接加性遗传力、母体直接加性遗传力、个体和母体直接加性相关系数则为0.13543、0.05101、0.05886; 0.08763、0.02931、-0.02526; 0.07423、0.01342、-0.00949。数据显示:母体效应对繁殖和生长性状的个体遗传效应都有影响,其中对繁殖性状的影响更大。(3)100kg体重日龄和背膘厚、总产仔数和产活仔数、总产仔数和初生窝重、产活仔数和初生窝重的遗传相关系数分别为-0.165、0.720、0.660、0.540。(4)2010年到2016年间大约克公猪100kg体重日龄的表型趋势和遗传趋势是-2.20、-1.57,且差异极显著(p0.01); 100kg体重背膘厚的表型趋势和遗传趋势为-0.169、-0.0480。大约克母猪的100kg体重日龄的表型趋势和遗传趋势为-0.769、-1.59,且差异极显著(p0.01); 100kg体重背膘厚的表型趋势和遗传趋势为-0.0680、-0.0501;总产仔数的表型和遗传趋势为0.0860、0.00500。并且差异极显著(p0.01)。
[Abstract]:In this study, a national core breeding farm in Fujian Province was used as the material of Yorkshire pig born from 2010 to 2016.Different genetic parameter models were studied by Derivative-Free Restricted Maximum Likelihoodand Best linear Unbiased prediction. The genetic parameters of 100kg body weight, backfat, total litter size, live litter size and litter weight were estimated.The phenotypic and genetic trends were analyzed.The results are as follows: (1) during the period from 2010 to 2016, the body weight of 100kg in about g pigs decreased gradually, and the backfat thickness of 100 kg body weight was in stable fluctuation, and the body weight of 100kg and 100kg in male was lower than that of female in sex analysis.The total litter size and live litter size of the first and eleventh births were the lowest, and the total litter size and the live litter size increased gradually from the second birth.The direct additive heritability, maternal direct additive heritability, individual and maternal direct additive heritability of 100 kg BW / day and 100kg body weight backfat thickness at the fifth trimester were 0.246960.02074-0.04522n0.580577- 0.149744, respectively.The direct additive heritability of total litter size, live litter size and birth litter weight, the direct additive heritability of maternal body, and the correlation coefficient of direct additive heritability between individual and mother were 0.13543n0.051010.05886; 0.08763n0.02931h-0.02526; 0.074230.01342- 0.00949.The data showed that maternal effect had an effect on individual genetic effects of reproductive and growth traits, and the effect on reproductive traits was greater than that on reproductive traits, including body weight and backfat thickness, total litter size and live litter size, total litter size and litter weight.The genetic correlation coefficients of live litter size and litter weight were -0.165 ~ 0.720 ~ (0.660) ~ (0.54) 0.54 ~ (4)) the phenotypic and genetic trends of 100kg body weight days of about g / g boars from 2010 to 2016 were -2.20 ~ (-1.57), and the difference was very significant (p < 0.01), and the phenotypic and genetic trends of 100kg body weight backfat thickness were -0.169- 0.0480.The phenotypic and genetic trends of 100kg body weight days were -0.769- 1.59, and the difference was very significant (p0.01), the phenotypic and genetic trends of 100kg body weight backfat thickness were -0.0680- 0.0501, and the phenotypic and genetic trends of total litter size were 0.08600.0.00500.The difference was very significant (P 0.01).
【学位授予单位】：华中农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S828

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