Genetic parameters of calving ease using sire-maternal grandsire model in Korean Holsteins.

Although a positive trend in production traits has been achieved, there is a growing concern for the reproductive performance of the dams, in particular to calving events leading to economic losses in the farm.

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Some linear model studies [ 6 , 22 ], however, showed a trend where the linear models estimates were generally lower than those of the threshold models reports.

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