Genetic analyses of mastitis data using animal threshold models and genetic correlation with production traits
Genetic analyses of mastitis data using animal threshold models and genetic correlation with production traits
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DOI：
10.3168/jds.s0022-0302(05)72902-7
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发表时间：
2005-06-01
影响因子：
3.5
通讯作者：
Kalm, E
中科院分区：
文献类型：
--
作者：
Hinrichs, D;Stamer, E;Kalm, E
在本研究中，分析了 3 个奶牛群的 6 个不同的乳腺炎数据集，总牛群规模为 3200 头德国荷斯坦奶牛。数据收集期包括哺乳期的前 50 天、100 天或 300 天。使用哺乳模型和测试日模型对 3 个数据收集期进行分析。所有模型均为动物阈值模型。哺乳模型数据集中的乳腺炎频率在 29% 至 45% 之间变化，在测试日模型数据集中的乳腺炎频率在 3% 至 6% 之间变化。根据数据收集的时间段，哺乳模型中乳腺炎的遗传力分别为 0.05（50 天）、0.06（100 天）和 0.07（300 天）。在测试日模型中，遗传力略高，值为 0.09（50 和 100 天）和 0.06（300 天）。在哺乳模型之间，相对育种值之间的等级相关性很高，在 0.86 和 0.94 之间变化。测试日模型的相对育种值之间的排名相关性范围为 0.68 至 0.87。哺乳模型和测试日模型的相对育种值之间的等级相关性在 0.51 和 0.80 之间变化。用线性动物测试日模型估计了乳腺炎和产奶性状之间的遗传相关性。与乳腺炎的相关性为 0.29（产奶量）、0.30（脂肪产量）、0.20（脂肪含量）、0.34（蛋白质产量）和 0.20（蛋白质含量）。乳腺炎和体细胞评分之间的估计遗传相关性为 0.84。
In the present study, 6 different mastitis data sets of 3 dairy herds with an overall herd size of 3200 German Holstein cows were analyzed. Data collection periods included the first 50, 100, or 300 d of lactation. The 3 data collection periods were analyzed with a lactation model and a test-day model. All models were animal threshold models. Mastitis frequencies in the lactation model data sets varied between 29 and 45%, and varied between 3 and 6% in the test-day model data sets. Depending on the period of data collection, heritabilities of liability to mastitis in the lactation models were 0.05 (50 d), 0.06 (100 d), and 0.07 (300 d). In the test-day models, heritabilities were slightly higher with values of 0.09 ( 50 and 100 d), and 0.06 ( 300 d). Between lactation models, the rank correlations between the relative breeding values were high and varied between 0.86 and 0.94. Rank correlations between the relative breeding values of the test-day models ranged from 0.68 to 0.87. The rank correlations between the relative breeding values of lactation models and test-day models varied from 0.51 and 0.80. Genetic correlations between mastitis and milk production traits were estimated with a linear animal test-day model. The correlations with mastitis were 0.29 (milk yield), 0.30 (fat yield), 0.20 (fat content), 0.34 (protein yield), and 0.20 (protein content). The estimated genetic correlation between mastitis and somatic cell score was 0.84.