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Variance Components and Genetic Parameters Estimated for Fat and Protein Content in Individual Months of Lactation: The Case of Tsigai Sheep
Sheep Milk Composition Test Day Model Variance Ratios Heritability Genetic Correlations
2016/5/19
The objective of this study was to assess variance components and genetic parameters for fat and protein content in Tsigai sheep using multivariate animal models in which fat and protein content in in...
Variance Components and Genetic Parameters for Milk Production and Lactation Pattern in an Ethiopian Multibreed Dairy Cattle Population
Genetic Parameters Milk Yield Multibreed Tropics
2016/5/12
The objective of this study was to estimate variance components and genetic parameters for lactation milk yield (LY), lactation length (LL), average milk yield per day (YD), initial milk yield (IY), p...
Genetic (Co)variance Components for Body Weight and Body Measurements in Makooei Sheep
Body Weight Body Measurement Sheep Animal Model REML Heritability
2016/5/6
The aim of this paper was to estimate genetic parameters for body weight and five body measurements for an experimental population of Iranian Makooei sheep maintained at the Makooei Sheep Breeding Sta...
用R法估计方差组分的原理、方法和应用Theory, Method and Application of Method R on Estimation of (Co)Variance Components
R法 方差组分 Method R (co)variance components
2007/12/5
综述了R法估计方差组分的原理、方法和应用，目的是使该方法能够得到合理应用。R法是通过计算全数据集对亚数据集随机效应的回归因子（R）来估计方差组分的。利用一种基于一个变换矩阵的多变量迭代算法，结合先决条件的共扼梯度法求解混合模型方程组使R法的计算效率大为改善。R法的主要优点是计算成本低，同时可以得到方差组分估值的抽样误差和近似置信区间。其缺点是对于同样的数据，R法较其他方法的抽样误差大，而且在小样本...