Implementation of a Routine Genetic Evaluation for Longevity Based on Survival Analysis Techniques In Dairy Cattle Populations in Switzerland

摘要

Genetic evaluation of sires for functional longevity of their daughters based on survival analysis has been implemented in the populations of Braunvieh, Simmen - tal, and Holstein cattle in Switzerland. A Weibull mixed sire-maternal grandsire survival model was used to es - timate breeding values of sires with data on cows that calved since April 1, 1980. Data on Braunvieh and Sim - mental cows included about 1.1 million records, data on Holstein cows comprised about 220, 000 records. Data Contained approximately 20 to 24/100 right-censored re - Cords and 6 to 9/100 left-truncated records.