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Paul VanRaden USDA Animal Improvement Programs Laboratory Beltsville, MD, USA 2004 Choice of Scales for Delivery of Genetic Evaluations.

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Presentation on theme: "Paul VanRaden USDA Animal Improvement Programs Laboratory Beltsville, MD, USA 2004 Choice of Scales for Delivery of Genetic Evaluations."— Presentation transcript:

1 Paul VanRaden USDA Animal Improvement Programs Laboratory Beltsville, MD, USA paul@aipl.arsusda.gov 2004 Choice of Scales for Delivery of Genetic Evaluations to the Public

2 Trait Scales - Interbull 2004 (2)P.M. VanRaden 2004 Can We Harmonize Trait Scales?  International marketing and education is difficult because scales differ  Advertisements cross national borders  9 of 19 full-page bull advertisements contained only pictures, no numbers! (Holstein International, March, 2004)  Internet sites provide foreign evaluations  Joint data analyses could produce evaluations on a common scale

3 Trait Scales - Interbull 2004 (3)P.M. VanRaden 2004 Time to Change Bases  Every 5 years (2005, cows born in 2000)  18 of 25 countries: AUS, BEL, CZE, DEU, ESP, EST, GBR, HUN, IRL, ISR, ITA, JPN, NLD, NZL, POL, SVN, USA, ZAF  At beginning of year?  Every year  6 countries: CAN, CHE, FIN, FRA, NOR, SWE  At beginning of year except FRA=June  Each evaluation  1 country: DNK

4 Trait Scales - Interbull 2004 (4)P.M. VanRaden 2004 Previous USA Base Changes 1965Predicted Difference (subtract mean yield) 1974Modified Contemporary Comparison 1984Red & White and Holstein bases separated 1989Red & White and Holstein bases merged, Animal Model 1995Age-Parity adjustments (changed trend) 2000Lifetime Net Merit, true protein (SD change)

5 Trait Scales - Interbull 2004 (5)P.M. VanRaden 2004 Possible Things To Do  Change mean and variance base  Change units and/or direction  Change evaluation models  Put different breeds on the same base  Submit to the Interbull test run  Prepare educational materials

6 Trait Scales - Interbull 2004 (6)P.M. VanRaden 2004 Somatic Cell Count  Measured with same standard metric unit (cells / ml) in every country  Transformed by log 2, log 10, or log e  Reversed scales in 9 of 19 countries  Added means of 100, 3, 4, etc.  Changed SD to report EBV, PTA, or STA Different choice in almost every country!

7 Trait Scales - Interbull 2004 (7)P.M. VanRaden 2004 Udder Health Scales CtryUnitMeanSDDirCtryUnitMeanSDDir USAPTA3.1.22—NLDRBV1004+ CANPTA3.0.25—DNKRBV1005+ BELEBV3.0.47—SWERBV1007+ JPNEBV2.4.42—DEURBV10012+ AUSEBV0.0.11—ITASTA41+ GBRPTA0.013—FRASTA01+ HUNSTA0.01—ESPSTA01+

8 Trait Scales - Interbull 2004 (8)P.M. VanRaden 2004 Longevity Scales CtryUnitMeanSDCtryUnitMeanSD GBRPTA00.3NLDRBV1004.0 CANPTA30.2DNKRBV1005.0 USAPTA01.7SWERBV10010.0 ISRPTA07.0DEURBV1008.0 CHEEBV04.1ITASTA31.0 AUSEBV01.9FRASTA01.0 NZLEBV011.0IRLSTA01.0

9 Trait Scales - Interbull 2004 (9)P.M. VanRaden 2004 Yield Trait Scales  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%  Age-parity adjustments differ  16 of 25 countries adjust to average parity  5 adjust to mature, 4 adjust to 1 st parity  Separate lactation proofs available  2 scales (RBV and EBV) seems too much

10 Trait Scales - Interbull 2004 (10)P.M. VanRaden 2004 Conformation Scales  Standardized Genetic Merit (PTA  SD)  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)

11 Trait Scales - Interbull 2004 (11)P.M. VanRaden 2004 Selection Index Scales  Units and SD not well documented  Top bull for total merit (February ‘04)  DNK 114, DEU 145, AUS 162, FRA 179  NZL 246, NLD 366, GBR 826  USA 857 (NM), USA 1918 (TPI)  ESP 2148, CAN 2360, ITA 2944  Ranking on home scale may include traits not evaluated by Interbull

12 Trait Scales - Interbull 2004 (12)P.M. VanRaden 2004 Conclusions  Base and scale changes go together  Many countries plan to change in Feb 2005  Too many different scales cause confusion  Direction of udder health / SCS unclear  Recommended scales may help  Only 3 months until September test run

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