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Genetic Evaluation of Milking Speed in Brown Swiss

Genetic Evaluation of Milking Speed in Brown Swiss. Introduction. International customers interested in milking speed Slow milkers disrupt parlor flow and efficiency Fast milkers may be at increased risk for mastitis. Scoring. Subjective 1 (slow) to 8 (fast) Began in 2004

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Genetic Evaluation of Milking Speed in Brown Swiss

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  1. Genetic Evaluation of Milking Speed in Brown Swiss

  2. Introduction • International customers interested in milking speed • Slow milkers disrupt parlor flow and efficiency • Fast milkers may be at increased risk for mastitis

  3. Scoring • Subjective • 1 (slow) to 8 (fast) • Began in 2004 • Maximum age of 68 mo

  4. Data • 7,366 records (2004 to present) • 6,666 cows • 393 herds • 21,458 ancestors born in 1985 and later • 6 unknown-parent groups including 4 birth years

  5. Animal Model • Fixed effects • Herd-appraisal date • Parity-lactation stage • 3 parities (1, 2, 3) • 4 90-d stages, 400 d, and unknown-calving group • Random effects • Animal • Permanent environment • Residual

  6. Variance Component Estimates • Heritability = 0.22 • Repeatability = 0.42 • Residual variance = 1.13

  7. Solutions for lactation stage by parity

  8. Correlation of milking speedwith production traits

  9. Investigation of SCS Correlation • Identify 60 bulls with common sires • Calculate correlation of SCS with milking speed within sire of bull • Correlation = 0.14, P = 0.276 • A few bull sires in a small-population breed could have caused the correlation of 0.40

  10. Correlation of milking speed with type traits

  11. Evaluations • Base • Set to 100 with SD of 5 • Bulls born from 1994 to 1999 with 10 daughters • 121 bulls • Range of 83 to 112

  12. Conclusions • Faster milking speed not associated with increased SCS • First evaluation for milking speed released by USDA in May 2006

  13. Further Research • Use scores supplied by AI organizations to explore breed differences • Use DHI-supplied times to estimate parameters with objective measurements • Extend evaluation to all breeds

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