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Genetic Evaluation of A ge at First Calving

Genetic Evaluation of A ge at First Calving. Data. First calving from January 1, 1997 to present Calving ages between 540 and 1105 days The cows sire had to be at least 5 years old 8,193,513 first calvings. Model. y = hys + a + e y = age at first calving

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Genetic Evaluation of A ge at First Calving

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  1. Genetic Evaluation of Age at First Calving

  2. Data • First calving from January 1, 1997 to present • Calving ages between 540 and 1105 days • The cows sire had to be at least 5 years old • 8,193,513 first calvings

  3. Model y = hys + a + e y = age at first calving hys = fixed effect of herd-year-season of birth a = random additive genetic effect e = random residual error

  4. Summary Statistics ― Cows currently milking

  5. Summary Statistics ― Active Bulls

  6. Correlations

  7. Correlations (Continued)

  8. Variance Component Estimates HO Heritability = 0.027 JE Heritability = 0.028

  9. Genetic Trend

  10. Genetic Trend

  11. Low Active HO Bulls

  12. High Active HO Bulls

  13. High and Low Active HO Bulls with > 90% rel

  14. Low Active JE Bulls

  15. High Active JE Bulls

  16. High and Low Active JE Bulls with > 90% rel

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