February 2007

Introduction

International genetic evaluations for female fertility traits of bulls from Belgium, Ireland, Israel, Italy, The Netherlands, New Zealand, Spain, Switzerland, United Kingdom, and The United States of America were included in this evaluation. 

Female fertility traits to be used in this Interbull test evaluation were classified as follows: 

Changes in Interbull procedures

Data and method of analysis

Traits submitted by the participating countries are presented in Table 1. 

Data were national genetic evaluations of AI sampled bulls with at least 10 daughters in at least 10 herds. Table 2 presents the amount of data included in this Interbull evaluation for Holstein. 

Information on the expression of national genetic evaluation results, (T)ransmitting abilities or (B)reeding values, and whether higher or lower values are desirable are presented in Table 3.

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 4).

Table 5 presents the date of evaluation as supplied by each country in the 019-proof file.

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.

Scientific literature

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

Weighting factors:

Fikse and Banos, 2001. J. Dairy Sci. 84:1759-1767

De-regression:

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
http://www.interbull.org/documents/genetic_correlation_estimation_procedure_042t.pdf

Time edits

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 "Publications and Documentation/General information".

Next routine international evaluation

The next routine international evaluation for female fertility traits is scheduled for May 2007.

New data for the February routine run should reach the Interbull Centre not later than Tuesday May 1, 2007, 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 February 10, 2007. Official release date of the results is targeted to be Monday May 14, 2007.

Next test international evaluation

The next test international evaluation for dairy production, conformation, udder health, longevity, calving traits (Brown Swiss, Holstein, Red Dairy Cattle) and female fertility traits (Holstein) is scheduled for March 2007. 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 March 2007 test evaluation is March 1, 2007 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 exercise 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.