Genetic Evaluation of Calving Traits in Denmark, Finland, and Sweden

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Birgitte Pedersen
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1 Genetic Evaluation of Calving Traits in Denmark, Finland, and Sweden Dorothee Boelling Ulrik Sander Nielsen Jukka Pösö Jan-Åke Eriksson Gert Pedersen Aamand

2 Introduction NAV: joined breeding value estimation across Denmark, Finland, and Sweden New group of traits: calving performance Two groups: Holstein and Red Dairy Group Procedures and results for Holstein will be presented here

3 Calving Traits For all traits Denmark Finland Sweden 1 st and later calvings Direct and maternal effect Survival Since 1985 cat. 0 1 Since 1992 cat. 0 1 Since 1982 cat. 0 1 Calving Ease Since 1985 cat. 1 4 Since 2004 cat. 1 4 Since 1982 cat. 1 2 Size of Calf Since 1985 cat. 1-4 none none

4 Survival Frequency of Survival 1 0,98 0,96 0,94 0,92 0,9 Dk 1 Fi 1 Sw 1 Dk 2 Fi 2 Sw 2 0, Year of calving

5 Calving Ease Use of Scale for Calving Ease, Holstein Denmark Fi from 2004 CE 1 CE 2 CE 3 CE 4 Sw eden 50% 60% 70% 80% 90% 100%

6 Calving Ease: 2 Scales Correlations between CE12 and CE14, either Maternal or Direct 1 0,98 0,96 0,94 0,92 0, Maternal Direct

7 The Statistical Model Y = Age at calving*country Year of calving*month of calving*country Sex of calf*year of calving* country Herd*5year*country Breed and heterosis Year within 5year-herd-country Sire Maternal Grandsire Residual fixed fixed fixed fixed regression random random random random

8 Genetic Parameters: Heritabilities Direct Maternal Survival Calving Ease Size of Calf Survival Calving Ease Size of Calf

9 Breeding Values for Birth and Calving Traits Birth Traits: direct breeding value = 2 x effect as sire of the calf + direct breed effects Calving Traits (DK + Fi): maternal breeding value = 2 x effect as MGS + maternal breed effects 0.5 x direct breeding value Calving Traits (Sw): MGS Breeding Value = 2 x effect as MGS + maternal breed effects

10 Results: Survival 1 Correlation betw een National and NAV EBVs for Survival 1 direct Correlation betw een National and NAV EBVs for Survival 1 m aternal 1 1 0,9 0,9 0,8 0,8 0,7 0, DK Fi Sw ,7 0, DK Fi Sw

11 Results: Calving Ease 1 Correlation for National and NAV EBVs for Calving Ease 1 direct Correlation betw een National and NAV EBVs for Calving Ease 1 maternal 1 1 0,9 0,9 0,8 0,7 0, DK Fi Sw ,8 0,7 0, DK Fi Sw

12 Results: Birth Index Genetic Trend: Birth Index DK dir Fi dir Sw dir Year of Birth of Sire

13 Results: Calving Index Genetic Trend: Calving Index DK mat Fi mat Sw mat Year of Birth of Sire

14 Changes to National Systems (1) Denmark Finland Sweden Data basis x x Multi-trait x x (1. + later calvings) Multi-trait x (SU, CE, (Size)) Effects in model x x x

15 Changes to National Systems (2) Denmark Finland Sweden Breed proport. + het. x x h 2 + correlations x x x Mat MGS effect x Base: national - NAV x x x

16 Outlook Interbull testrun in March 2007 Still national breeding value estimation Model for Holstein ready for implementation Work still under progress for Red Dairy Cattle

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