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Udder Health and Longevity in Cattle Genetic Gain 1995-2000

Explore changes in udder health and fertility genetic gain, UH scales conversion, PL benefits, and correlation updates. Learn about yield trait scales adjustments and proposed changes in the industry. Discover the impact of adjusting yield to average age and conformation scales in cattle breeding.

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Udder Health and Longevity in Cattle Genetic Gain 1995-2000

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  1. NAAB Update:Base Change, Udder Health, Longevity, Fertility

  2. Genetic Gain 1995-2000

  3. SCS and DPR Breed Means

  4. Udder Health Scales

  5. Convert SCS to Udder Health? • PTA UH = -5 (PTA SCS – breed avg) • Reversed scale with mean 0, SD 1 • Interpreted like linear trait STA’s • Positive numbers are favorable • Range similar to DPR, PL • Udder Health is term of Interbull

  6. Longevity Trend Testing • USA Method 2 results (DYD trend) • HO bias = -.006, < limit = .035 • BS, GU bias (-.035, .032) near limit • JE, AY bias (-.072, -.089) over limit • Method 3 (data cutoff) OK for HO • Interbull rejected 5 of 15 countries

  7. Use of MACE Longevity • Compare USA and MACE REL • MACE for single-trait (direct) PL only • AIPL then combines other trait info • Label multi-trait PL as MACE • Get foreign bull DPR from MACE PL • Better PL implies better DPR • Predict foreign DPR from PL, SCS, etc

  8. Single vs Multi-Trait PL • Used Nov ‘01 to predict Feb ’04 PTA PL 5% benefit expected, 3% observed 547 bulls born >1995 (before vs after 1st crop daus) .1 decline in multi-trait PTA PL 3% benefit expected, 1% observed 309 bulls born 1992-94 (1st vs 2nd crop daus) .4 decline in multi-trait PTA PL • Yield correlations have been reduced • Fertility correlation now included

  9. Cows Sold Before 1st Test • Some contribute to PL (since 2004) • Database modified to store fresh dates with 0 tests (like heifers) • 1 DRPC does not receive these, may be partial reporting (also CE?) • PL daus > milk daus for more bulls

  10. Yield Trait Scales • Age-parity adjustments differ • 16 of 25 countries adjust to average parity • 5 adjust to mature, 4 adjust to 1st parity • Separate lactation proofs available • True protein in 5 of 21 countries: • AUS, FRA, HUN, POL, USA (as of 2000) • True% = Crude% - .19 (e.g. 3.00% vs 3.19%) • Protein yield (kg) reduced by 5-6%

  11. Adjust Yield to Average Age? • Proposed by USDA in 1994 • Recommended by Holstein GAC, Oct 1994 • Vetoed by Council “to allow the industry time to consider the nature and effect of such a change.” • Mature EBV kg = 36 mo PTA lb • PTA lb / EBV kg = 2.2 / 2 = 1.1 • Reduced age divides by 1.1 • New Holstein base SD will multiply by 1.11 • Other breed SD increase by 1.05 to 1.18

  12. Conformation Scales • Standardized Transmitting Ability • Mean = 0, SD = 1 • 9 of 21 countries: CHE, CZE, DNK, FRA, HUN, GBR, ITA, JPN, USA • Relative Breeding Values • Mean = 100, SD = 4, 7, 10, 12 • 8 countries in northern Europe • PTA, EBV, or other (4 countries) • Convert USA minor breeds from PTA to STA?

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