Interbull Routine Genetic Evaluation for Udder Health Traits
The latest test international evaluation for udder traits took place as scheduled at the Interbull Centre. Data from twentytwo (22) countries were included in this evaluation.
International genetic evaluations for udder health traits of bulls from Australia, Austria-Germany, Belgium, Canada, Czech Republic, Denmark-Finland-Sweden, Estonia, France, Hungary, Ireland, Israel, Italy, Japan, Netherlands, New Zealand, Norway, South Africa, Slovak Republic, Spain, Switzerland, the United Kingdom, and the United States of America were computed. Brown Swiss, Holstein, Red Dairy Cattle, Guernsey, Jersey and Simmental breed data were included in this evaluation.
Changes in national procedures
Changes in the national genetic evaluation of udder health traits are as follows:
|FRA||(HOL):||Partecipating with clinical mastitis data for the first time.|
|EST||(HOL,RDC):||New definition of fixed effects|
|NOR||(RDC):||Using somatic cell as a predictor for clinical mastitis|
|ITA||(SIM):||Fixed effect parity by age at calving by DIM class has been changed into parity by age at calving by DIM class by class of year of calving, 5 years; moreover|
|covariate for DIM nested into this fixed effect has been also added to the model. New Variance Component estimastion for SCS has been carried out.|
|ITA||(BSW):||Slightly different data editing procedure, slightly different classification of some fixed effect and upgrade of procedure for computation of EDC for all traits|
|SVK||(SIM):||Harmonized EDC methodology|
|PRT||(HOL):||Corrected some mistakes like duplications and decided to increase the breed criteria to include females on the national evaluations.|
Changes in Interbull procedures
NFor this routine run the pedigree source has solely been from the Interbull Pedigree
Database and no pedigree has been formed from the information in the 010-files.
Data and method of analysis
Data were national genetic evaluations of AI sampled bulls with at least 10 daughters or 10 EDC (for clinical mastitis and maternal calving traits at least 50 daughters or 50 EDC, and for direct calving traits at least 50 calvings or 50 EDC) in at least 10 herds. Table 1 presents the amount of data included in this Interbull evaluation for all breeds.
National proofs were first de-regressed within country and then analysed jointly with a linear model including the effects of evaluation country, genetic group of bull and bull merit. Heritability estimates used in both the de-regression and international evaluation were as in each country's national evaluation.
Table 2 presents the date of evaluation as supplied by each country in the 01x-proof file.
Estimated genetic parameters and sire standard deviations are shown in APPENDIX I and the corresponding number of common bulls are listed in APPENDIX II.
Ancestor-bulls without own proofs were traced as far back as possible from the oldest bulls with proofs in order to increase across country connections and account for the effect of selection.
Genetic groups were defined according to unidentified parents by national origin, breed and birth year of the bull and path of selection (sire, maternal grand-sire, maternal grand-dam). Minimum group size was set to 30.
The international genetic evaluation procedure is based on international work described in the following scientific publications:
International genetic evaluation computation:
Schaeffer. 1994. J. Dairy Sci. 77:2671-2678
Klei, 1998. Interbull Bulletin 17:3-7
Verification and Genetic trend validation:
Klei et al., 2002. Interbull Bulletin 29:178-182.
Boichard et al., 1995. J. Dairy Sci. 78:431-437
Fikse and Banos, 2001. J. Dairy Sci. 84:1759-1767
Sigurdsson and G. Banos. 1995. Acta Agric. Scand. 45:207-219
Jairath et al. 1998. J. Dairy Sci. Vol. 81:550-562
Genetic parameter estimation:
Klei and Weigel, 1998, Interbull Bulletin 17:8-14
Sullivan, 1999. Interbull Bulletin 22:146-148
Post-processing of estimated genetic correlations:
Mark et al., 2003, Interbull Bulletin 30:126-135
Jorjani et al., 2003. J. Dairy Sci. 86:677-679
Weigel and Banos. 1997. J. Dairy Sci. 80:3425-3430
International reliability estimation
Harris and Johnson. 1998. Interbull Bulletin 17:31-36
Publication of Interbull evaluations
Results were distributed by the Interbull Centre to designated representatives in each country. The international evaluation file comprised international proofs expressed on the base and unit of each country included in the analysis. Such records readily provide more information on bull performance in various countries, thereby minimising the need to resort to conversions.
At the same time, all recipients of Interbull results are expected to honour the agreed code of practice, decided by the Interbull Steering Committee, and only publish international evaluations on their own country scale. Evaluations expressed on another country scale are confidential and may only be used internally for research and review purposes.
All recipients are also expected to follow the agreed guidelines for advertising genetic merit. The guidelines has been distributed to all members and is available on the Interbull homepage (http://www.interbull.org) under "Public Area/Publications/Guidelines/Interbull Advertising Guidelines".
Next routine international evaluation
The next routine evaluation of Interbull for production, conformation, udder health, longevity, calving, female fertility and workability traits is scheduled for April 2012. Deadline for sending data to the Interbull Centre is Tuesday March 20, 2012, 17:00 CET; confidential distribution of results is targeted for Thursday March 29, 2012, with earliest possible official release of results on April 3, 2012.
Next test international evaluation
The next test run for production, conformation, udder health, longevity, calving, female fertility and workability traits will take place in January 2012.
Countries planning to introduce changes in their national evaluation procedures and wishing to have them included in the routine Interbull evaluation, should have their data examined in this test run. New data and validation results should be sent to the Interbull Centre no later than January 17, 2012, 17:00 CET.
Means of result distribution from the Interbull Centre
Electronic exchange of data is probably more efficient
than anything else. Currently most countries in the service have established
internet connections and receive international evaluation results on the day of
their release. Subscribers to the service that do not already has this
option are encouraged to consider it and establish an internet connection and
ftp account. When such accounts are available, please provide their
specifications to the Interbull Centre. Until then, data will be delivered on
For more information about the international genetic evaluation service please contact the Interbull Centre: address: SLU Box 7023, 750 07 Uppsala, Sweden; fax: +46-18-672648;
For all communication regarding Interbull services, please