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Stillbirth, Productive Life, and Net Merit Update

Stillbirth, Productive Life, and Net Merit Update. Stillbirth Evaluations. Percent stillbirths in first-calf heifers (%SBH), similar to calving ease (%DBH) Sire SB: 12.0% +- 1.5% Daughter SB: 12.0% +- 2.5% Range 8 – 17% sire, 6 – 27% daughter Fewer stillbirths (avg 5%) in later parities

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Stillbirth, Productive Life, and Net Merit Update

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  1. Stillbirth, Productive Life, and Net Merit Update

  2. Stillbirth Evaluations • Percent stillbirths in first-calf heifers (%SBH), similar to calving ease (%DBH) • Sire SB: 12.0% +- 1.5% • Daughter SB: 12.0% +- 2.5% • Range 8 – 17% sire, 6 – 27% daughter • Fewer stillbirths (avg 5%) in later parities • Number of records half of calving ease • Display 4 traits or only an index?

  3. Stillbirth Data Stillbirth Score

  4. Stillbirth Genetic Trend DSB = Daughter (cow’s) contribution to stillbirth rate. SSB = Service sire’s contribution to stillbirth rate.

  5. Distribution of Reliabilities

  6. Correlations Among Traits(99% Rel bulls, n = 571)

  7. Correlations among domestic and Interbull stillbirth solutions (≥ 90% Rel)

  8. Economic Assumptions • Newborn calf value • $450 for females • $150 for males • Expenses per difficult birth (4 or 5) • $75 labor and veterinary • $100 reduced milk yield • $75 reduced fertility and longevity • 1% chance of cow death ($1800)

  9. Calving Ability Indexes

  10. Calving Ability

  11. Holstein Pregnancy Rate − Phenotypic and Genetic Trend 1965−2000

  12. Culling Emphasis

  13. Flat PL Credits 140 120 100 80 Credit (%) 60 40 1 2 3 20 0 0 1 2 3 4 5 Years

  14. Lactation Curve PL Credits 140 120 100 80 Credit (%) 60 40 1 2 3 20 0 0 1 2 3 4 5 Years

  15. Correlation of PL, Other TraitsPTA of bulls born since 1995

  16. NOT on Herdlife Builder List

  17. Herdlife Builders?

  18. Top PL Proof StabilitySelect Sires bulls born 1995-96, current REL PL > 90% PL adjusted to 2005 base

  19. Bottom PL Proof StabilitySelect Sires bulls born 1995-96, current REL PL > 90% PL adjusted to 2005 base

  20. Top DPR Proof StabilitySelect Sires bulls born 1995-96, current REL DPR > 90% DPR adjusted to 2005 base

  21. Bottom DPR Proof StabilitySelect Sires bulls born 1995-96, current REL DPR > 90% DPR adjusted to 2005 base

  22. Days Open Genetic Correlations Jorjani, 2005 Interbull Bulletin DFS = Denmark-Finland-Sweden

  23. Predict Longevity from Fertility • Which cow fertility trait contributes most to longevity? • Days to first insemination (DFI) • Non−return rate (NR) • Longevity depends most on DFI • Correlations = .33 DFI, .11 NR in USA • 23% DFI and 12% NR used in CAN • Only DFI used in NLD

  24. Fertility Trait Indexes% relative emphasis 1Time from first to last insemination replaces non−return rate 2Countries that evaluate only days open or calving interval 3Countries that evaluate only non−return rate or number of inseminations

  25. Milk, Fat, and Protein PricesFederal Order Class III (Cheese)

  26. Proposed and Current PricesNet Merit, Cheese Merit, and Fluid Merit

  27. Changes expected for August • Stillbirth evaluation • Include in calving ability index • New definition of productive life • Credit for longer lactations • Lower correlation with fertility • Standard deviation 1.43 times larger • Update NM$ economic values

  28. Carlin M Ivanhoe Bell – BL CV

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