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Stillbirth, Longevity and Fertility Update

Stillbirth, Longevity and Fertility Update. Trait Definition. Percent stillbirths in heifers (%SBH), analagous to calving ease (%DBH) Bases are stillbirths in heifers having bulls Direct: 11.6% (bulls born in 2000) Maternal: 13.6% (bulls born in 1995) Provides “worst case” estimates

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Stillbirth, Longevity and Fertility Update

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  1. Stillbirth, Longevity and Fertility Update

  2. Trait Definition • Percent stillbirths in heifers (%SBH), analagous to calving ease (%DBH) • Bases are stillbirths in heifers having bulls • Direct: 11.6% (bulls born in 2000) • Maternal: 13.6% (bulls born in 1995) • Provides “worst case” estimates • Alternative definitions • Calf livability = 100 - %SBH

  3. Stillbirth Scores by Parity

  4. Distribution of PTA

  5. Distribution of Reliabilities

  6. Product-Moment Correlations(99% Rel, n = 571)

  7. Genetic correlations among Interbull evaluations for stillbirth1,2

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

  9. Calf Livability

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

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

  12. PL Heritabilities and Correlations

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

  14. PL Questions • Flat or lactation curve credits? • Use data at 40 instead of 36 mo? • Adjust for inbreeding? • Curve definition passes trend tests with or without adjustment • Increase SD by 1.43? • Test in March, implement in May?

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

  16. Daughter Conception Rate Genetic CorrelationsJorjani, 2005 Interbull Bulletin DFS = Denmark-Finland-Sweden

  17. Have Computer, Need Data

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