Genetic Evaluation for Show Jumping in Belgium Developments
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Genetic evaluation for show jumping in Belgium developments Steven Janssens Wageningen 26/05/2011 The Belgian genetic evaluation of sporthorses • based on competition data (from 1992-2010) • complete rankings of horses (n=46300) within each competition (= from first to last on a given location and date) • => transformed rank, within competition 1,2,3…n => +3, ….0, …..-3 (cont’d) • Bivariate animal model recreational level (n=358931) national level (n=390402) • Non genetic factors: sex (male/female), age (4 to 18 yrs), competition, perm environment • h2 = 0.11 and 0.10; perm=0.18 and 0.13 rg = .63 • Interstallion standardisation: average of 100 = average ebv of horses born from (-7 to -18 years) 20 index points = 1 gen. standard deviation but…. • many competing horses in Belgium originate from different studbooks …..mainly Belgian Warmblood (BWP), Cheval de Sport (sBs) and Zangersheide (Z) but also KWPN, Hann, Holst, SF access only to the pedigree of the Belgian horses but these use different numbering systems. • many (Belgian) foals are sired by foreign stallions …..we have the pedigree but estimating bv’s for foreign stallions is not really the objective • Belgian horses compete abroad…. Distribution of sires in 2008 Sweden Thoroughbred 2% 2% USA 4% Denmark 5% Netherlands Belgium 18% 49% Germany 18% France 2% • Substantial export of sporthorses good “genes” are performing outside Belgium and are not recorded • In total only about 4000 to 5000 foals are born => how to increase the information for breeding value estimation Possible improvements… 1. Integrate foreign breeding values in the Belgian evaluation (for stallions that “sired” in Belgium) 2. Use performances at international level (outside Belgium) from Belgian horses 3. Develop a tool to integrate pedigree files from different breeding associations Material and methods (I) • KWPN, SF and FN were contacted to obtain ebv’s of their stallions on their “scale” (these were stallions with an ebv in Belgium) • SF , 98 stallions of which 93 with ebv’s in both KWPN , 67 stallions of which 47 with ebv’s in both • FN (Germany) did not allow us to use German ebv’s for “extra” computations Material and methods (II) • Conversion of foreign breeding values towards the Belgian scale=> 3 methods were investigated (weighted LS / Wilmink / Goddard ) => crossvalidation of equations Conversion of FR is stable, Nl less stable prelim. WLS seems best • Compute “converted Belgian” reliability from foreign reliability 3 methods (Goddard / Interbull / Interbull simple) => needs the genetic correlation between traits across countries (known for France/Belgium (Ruhlmann et al. 2009) but not for Netherlands/Belgium) Material and methods (III) • 2 methods to compute EBV’s ..normal BLUP modified Bayesian (Legarra et al. 2007) (uses converted ebv’s and Rel as prior information) • So 9 combinations with Bayesian model were generated => adequacy of models (bias, msep) => prediction ability (full data vs. reduced sets) Results • Reference is usual Belgian ebv 2009 • Overall effect on ebv’s ranking not much altered (r>0.99) slight increase of ebv variance small drop of mean ebv • Foreign stallions French stallions decrease (3 to 7%) Dutch stallions increase (2,5 to 9%) Ebv’s of foreign stallions are affected 0,6 0,4 Belgian index is reinforced 0,2 0 1978 1983 1988 1993 1998 2003 VEE moyen -0,2 -0,4 Final index is « sum» of 2 -0,6 sources -0,8 Date de naissance BLUP WLS WLS+Goddard Reliabilities of foreign stallions improve 0,90 0,80 0,70 0,60 0,50 0,40 Précision 0,30 0,20 0,10 Increase in average precision of ebv’s compared to BLUP2009 0,00 1978 1983 1988 1993 1998 2003 Année de naissance BLUP Pays-Bas Wilmink + Goddard Wilmink + IB Conclusions • Improvement of precision • Most interesting for stallions imported at young age without progeny in Belgium (we gain 4 years…) • Stability of ebv’s improve (tested by deleting 4 years of data+foreign information) but we need estimates of gen. corr. between countries better approximations of reliabilities International performances of BWP- horses (Maarten Aerts) • International performances are in the picture => demand from breeders to include them in ebv • How does this information combine with the existing information on show jumping? Results • FEI data were obtained but only recent year (2010) seems complete ( (problems country of registration/origin/…) • Manual data (only BWP) > 10000 performances ( 2008, >2010) • Join International data with the regular data for genetic evaluation Descriptive data (age distribution) Computations • Highest level achieved..combined data vs. National • Ranking (national data) + 0/1 trait for international perform • REML / Gibbs sampling • Genetic parameters Effect on changes of ebv of stallions Integrating horse studbook databases Anneleen Van Geystelen From local to global Data warehouse Global Schema 21 Global schema ID Studbook_number Studbook Name_mother Original_studbook_number Number_mother Original_studbook Foal_number has as mother UELN 0..n Chip_number 0..1 Name HORSE 0..1 Sex Day 0..n Date_birth Month has as Colour Year father Height Day Date_death Month Name_father Percentage_arab Year Number_father 22 Percentage_thoroughbred MAPPING MATCHING (EVALUATION) APPLICATIO N 23 Matching rules for each field name sex numbers UELN chip number birth date parents height death date 24 Matching on 1 field ROC curve of different matching rules AUC of different matching rules with 1 variable with 1 variable 1.0 0.8 0.6 name AUC numbers 0.4 true positiverate true UELN chipnumber parents 0.2 death date birth date height 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.0 0.2 0.4 0.6 0.8 1.0 name height UELN false positive rate parents numbers birth date birth death date death chipnumber Result on draught horse databases 17.35%21,721 overlap 23,90619.10% 235 567 4,311 precision 91.23% 110 506 4,148 Conclusions • Use of external EBV’s is promising. Also demand from sheep breeders • Follow up study of Interstallion PP2 needed to estimate gen. correlations between countries • Matching-id project might resolve a time consuming work and help to integrate information • Further developments of Belgian ebv’s are a balance between breeder demands and what is scientifically reasonable.