Interbull Routine Genetic Evaluation for Calving Traits

February 2005

Introduction
International genetic evaluations for calving traits of bulls from Australia, Denmark, Finland, France, Italy, The Netherlands, Switzerland, Sweden, and The United States of America were computed in this evaluation for the Holstein breed.

Changes in national data compared to the Interbull Test Evaluation in September 2004

• Canada do not participate in the current routine evaluation. Because the expression of the Canadian trait (% easy births/calvings) bulls cannot receive an evaluation larger than 100%, but this was the case for some foreign bulls.
• Germany did decide not to participate in the current routine evaluation.
• The USA discovered an error in their calving traits file for maternal effects and is, therefore only participating with direct traits for the current evaluation.

Changes in Interbull procedures compared to the Interbull Test Evaluation in September 2004

• The edit of at least 50 daughters in at least 10 herds did not work in the test run, but that bug should be fixed now

Data and method of analysis

Data were national genetic evaluations of AI sampled bulls with at least 50 daughters in at least 10 herds. Table 1 presents the amount of data included in this Interbull evaluation.

Table 2 presents the date of evaluation as supplied by each country in the 018-proof file.

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 3).

Estimated genetic parameters are shown in APPENDIX I and the corresponding number of common bulls are listed in APPENDIX II.

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). Minimum group size was set to 30.

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 "Publications and Documentation/General information".

Next routine international evaluation

The next routine international evaluation for dairy production, udder health conformation, longevity and calving traits (Holstein) is scheduled for May 2005. New data for the May routine run should reach the Interbull Centre not later than Tuesday April 26,2005, 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 May 5, 2005. Official release date of the results is targeted to be Monday May 9, 2005.

Next test international evaluation

The next test international evaluation for dairy production, conformation, udder health, longevity and calving traits (Holstein) is scheduled for March 2005. Countries wishing to enter the system for the first time or planning to submit new information (modified national evaluation procedure, newbreeds 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 March 2005 test evaluation is March 1, 2005 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 CD-ROM's.

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.