Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland.
J Anim Breed Genet. 2013 Apr;130(2):89-97. doi: 10.1111/j.1439-0388.2012.01007.x. Epub 2012 May 15.
Genetic parameters for different claw disorders, overall claw health and feet and leg conformation traits were estimated for Finnish Ayrshire cows. The merged data set with records of claw health and feet and leg conformation traits consisted of 105,000 observations from 52,598 Finnish Ayrshire cows between 2000 and 2010. The binary claw health data and the linearly scored conformation data were analysed using an animal model and restricted maximum likelihood method by applying the statistical package ASReml. Binomial logistic models with mixed effects were used to estimate genetic parameters for sole haemorrhages, chronic laminitis, white-line separation, sole ulcer, interdigital dermatitis, heel horn erosion, digital dermatitis, corkscrew claw and overall claw health. Estimated heritabilities for different claw disorders using a binomial logistic model ranged from 0.01 to 0.20. Estimated heritability for overall claw health using a binomial logistic model was 0.08. Estimated heritabilities for feet and leg conformation traits ranged from 0.07 to 0.39. The genetic correlations between claw health and feet and leg conformation traits ranged from -0.40 to 0.42. All phenotypic correlations were close to zero. The moderate genetic correlation, together with higher heritability of feet and leg conformation traits, showed that RLSV (rear leg side view) is a useful indicator trait to be used together with claw trimming information to increase the accuracy of breeding values for claw health in genetic evaluation.
为芬兰爱尔夏牛估计了不同蹄病、整体蹄健康以及蹄腿结构性状的遗传参数。2000 年至 2010 年间，将蹄健康和蹄腿结构性状记录合并的数据集中包含了 52598 头芬兰爱尔夏牛的 105000 个观测值。使用动物模型和受限极大似然法，通过应用统计软件 ASReml 分析了二进制蹄健康数据和线性评分的结构数据。使用混合效应二项逻辑模型来估计蹄底出血、慢性蹄叶炎、白线分离、蹄底溃疡、趾间皮炎、蹄踵角质侵蚀、蹄皮炎、螺旋形蹄和整体蹄健康的遗传参数。使用二项逻辑模型估计的不同蹄病的遗传力范围从 0.01 到 0.20。使用二项逻辑模型估计的整体蹄健康的遗传力为 0.08。蹄腿结构性状的遗传力估计值范围从 0.07 到 0.39。蹄健康与蹄腿结构性状之间的遗传相关系数范围从-0.40 到 0.42。所有表型相关系数接近零。中等的遗传相关系数，加上蹄腿结构性状的较高遗传力，表明 RLSV（后腿侧视图）是一个有用的指示性状，可以与蹄修剪信息一起使用，以提高遗传评估中蹄健康的育种值的准确性。
