Interbull Routine Genetic Evaluation for Udder Health Traits
International genetic evaluations for milk somatic cell and clinical mastitis of bulls from Canada, Czech Republic, Denmark, Estonia, Finland, France, Germany, the Netherlands, Norway, Sweden, Switzerland, The United Kingdom, The United States of America, Israel, Italy, Australia, Hungary, Belgium, Japan, Spain, Rep. South Africa New Zealand and Ireland were computed in this evaluation. Red Dairy Cattle, Brown Swiss, Guernsey, Holstein, Jersey and Simmental breed data
Changes in national data
|*||EST||HOL, RDC||All bulls included in the evaluation|
|*||USA||all breeds||Improved best prediction software and correlations used to calculate SCS lactation records|
|*||ITA||HOL||DIM and a four seasons effect have been included in the model.|
|*||NOR||RDC||Computed EDC using Pete Sullivans model|
|*||CHE||HOL||IDs of Red&White bulls have now identified with RED instead of HOL.|
|*||CAN||all breeds||Adjustment for pregnancy and a small change in contemporary group definition.|
|*||GBR||JER, RDC||Inclusion of a records from Jersey Island (previously not submitted to Interbull) with those from the mainland (previously submitted to Interbull). Until now Jersey evaluations were based only on mainland daughter records and bulls from the island that have daughters already on the Island but used on the mainland were treated as foreign bulls and thus coded with status '21'.The merging of both data sets means that these bulls are now coded '12' and they are no longer considered foreign bulls. Changes for RDC refer to inclusion of animals with pedigree status X.|
|*||NLD||all breeds||Change of database for Flemish data|
Changes in Interbull procedures
Data and method of analysis
Data were national genetic evaluations of AI sampled bulls
with daughters in at least 10 herds. For clinical mastitis information to be
included, an additional requirement was that bulls had to have at least 50
daughters. Table 1 presents the amount of data included in this Interbull
evaluation. Table 2,
table 3 and table 4 gives heritabilities and some additional information
on national evaluations as provided by the participating countries.
Estimated genetic parameters are shown in APPENDIX I and the number of common bulls are listed in APPENDIX II.
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 and table 3).
Ancestor-bulls without own proofs were traced back two generations 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). Birth year grouping was by 1-5 year periods. Smaller groups (consisting of less than 30 bulls) were combined.
International genetic evaluations were computed using effective daughter contributions (EDC) as weighting factors.
For each breed, two separate international genetic evaluations were computed. The first included milk somatic cell de-regressed proofs from individual countries. The second included de-regressed proofs for clinical mastitis as a direct trait from countries that made this information available and milk somatic cell de- egressed proofs from all other countries. Note that the second evaluation was not carried out for BSW and GUE since none of the participating countries provided clinical mastitis information.
Publication of Interbull evaluations
Test evaluation results are meant for review purposes only
and should not be published
Genetic correlation estimation procedure
Next routine international evaluation
The next routine international evaluation for dairy production, udder health conformation, longevity,calving traits (BSW, Holstein, RDC), female fertility and workability is scheduled for April 2009. New data for the April routine run should reach the Interbull Centre not later than Tuesday March 24, 2009, 17:00 Central European Time (CET); in any case, the most recently received data will be considered. The target time for distribution of results for internal review to designated representatives, who have signed a confidentiality agreement with the Centre, is Thursday April 2, 2009. Official release date of the results is targeted to be Tuesday April 7, 2009.
Next test international evaluation
The next test international evaluation for dairy
production, conformation, udder health, longevity and calving traits (Red dairy
cattle breeds, Brown Swiss, Holstein), female fertility and workability traits
is scheduled for May 2009. Countries wishing to enter the system for the first
time or planning to submit new information (modified national evaluation
procedure,new breeds etc) for following routine evaluations must have their data
tested in this test-run.
Deadline for sending data and validation results to the Interbull Centre for the May 2009 test run is April 28, 2009 at 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;
Please use Interbull_at_hgen.slu.se for all communication
regarding Interbull services.