R. C. Goodling *1,2 , G. E. Shook 1 , K. A. Weigel 1 , N. R. Zwald 1 , R. D. Welper 3 1 University of Wisconsin, Madison, WI 2 Current Address: Animal Improvement Programs Laboratory Agricultural Research Service, USDA, Beltsville, MD [email protected]3 Alta Genetics, Watertown, WI Effect of Synchronization Protocols on Days Open and Pregnancy Rate at 120 Days in Dairy Cattle
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Effect of Synchronization Protocols on Days Open and Pregnancy Rate at 120 Days in Dairy Cattle
Effect of Synchronization Protocols on Days Open and Pregnancy Rate at 120 Days in Dairy Cattle. Reproductive Performance. History Decreasing performance over time Negative correlation with production traits Poor performance costly to producers Use of synchronization protocol - PowerPoint PPT Presentation
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R. C. Goodling*1,2, G. E. Shook1, K. A. Weigel1, N. R. Zwald1, R. D. Welper3
1University of Wisconsin, Madison, WI2Current Address: Animal Improvement Programs LaboratoryAgricultural Research Service, USDA, Beltsville, [email protected] Genetics, Watertown, WI
Effect of Synchronization Protocols on Days Open and Pregnancy Rate
at 120 Days in Dairy Cattle
ADSA-ASAS Joint Meeting 2004 (2) R. C. Goodling
Reproductive Performance History
Decreasing performance over time Negative correlation with production
traits Poor performance costly to producers
Use of synchronization protocol Numerous protocols available Dependent upon herd Variety of herd applications
ADSA-ASAS Joint Meeting 2004 (3) R. C. Goodling
Objectives Determine effects of synchronization
protocols on genetic parameter estimates for: Days open (DO) Pregnancy rate at 120 days (PR120)
Evaluate best approach to analyze reproduction field data with synchronization
ADSA-ASAS Joint Meeting 2004 (4) R. C. Goodling
Traits Days open (DO)
Includes interval from calving to first breeding (DFB) and the interval from breeding to conception
Current selection on related trait (DPR) Handles cows that do not breed back
Pregnancy rate at 120 d (PR120) Categorical trait Reflects 13 month calving interval Available before DO, less censoring
ADSA-ASAS Joint Meeting 2004 (5) R. C. Goodling
Data Collection 64 herds on progeny testing program