Genetic Evaluation of Milking Speed for Brown Swiss Dairy Cattle

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Presentation transcript:

Genetic Evaluation of Milking Speed for Brown Swiss Dairy Cattle

Introduction International customers for Brown Swiss customers are interested in milking speed information Slow milkers disrupt parlor flow and efficiency Fast milkers may be at increased risk for mastitis

Scoring Scored 1 to 8 (low to high) Began in 2004

Data 6,483 records 6,017 cows 352 herds 19,209 ancestors born 1985+ 7 unknown parent groups including 4 birth years

Model Fixed effects: Random effects: Herd appraisal date Parity-stage of lactation (4 90-d stages) Random effects: Animal Permanent environment Residual

Variance Component Estimates Heritability = 0.22 Repeatability = 0.41 Residual variance = 1.13

Solutions for stage of lactation (90-d period) by parity

Correlations of milking speed with production traits P-value Milk 0.22 0.0231 Fat 0.02 0.8440 Protein 0.03 0.7817 Productive Life 0.52 <0.0001 SCS -0.37

Conclusions Faster Milking Speed not associated with Increase SCS Evaluation for MSD released May 2006 Further research on stud supplied scores, or DHI supplied times