Interbull Routine Genetic Evaluation for Direct Longevity Traits

Interbull Routine Genetic Evaluation for Direct Longevity

August 2013

Introduction
The latest routine international evaluation for longevity trait took place as scheduled at the Interbull Centre. Data from twenty (20) populations were included in this evaluation.

International genetic evaluations for direct longevity trait of bulls from Australia, Belgium, Canada, Switzerland, Germany, Denmark-Finland-Sweden, Spain, France, The United Kingdom, Ireland, Israel, Italy, New Zealand, The Netherlands, The United States of America, Hungary, Slovenia and Czech Republic were computed. Brown Swiss, Guernsey, Holstein, Jersey, Red Dairy Cattle and Simmental breed data were included in this evaluation.

Changes in national procedures
Changes in the national genetic evaluation of longevity traits are as follows:

HUN	HOL:	Old data was used.

CHE	RHOL,SIM:	Number of herds/daughters/EDC reduced for some bulls.

IRL	HOL:	Reduction in the number of evaluated bulls, due to discarding bulls with no progeny and recorded as being slaughtered.

CZE	HOL,SIM:	Reduction in number of herds/daughters/EDC for some bulls

ITA	HOL:	A time period of 1985-2005 is considered. Some bulls changed status from official to non-official, and number of herds/daughters/EDC decreased for some bulls

ESP	HOL:	Upper time limit of year 2006 is considered.

CHE	HOL:	Status change from official to non-official, and reduction of number of herds/daughters/EDC for some bulls

INTERBULL CHANGES COMPARED TO THE APRIL ROUTINE RUN
No changes in Interbull procedures

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.

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
https://wiki.interbull.org/public/rG%20procedure?action=print

Time edits

Weigel and Banos. 1997. J. Dairy Sci. 80:3425-3430

International reliability estimation

Harris and Johnson. 1998. Interbull Bulletin 17:31-36

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 December 2013. Deadline for sending data to the Interbull Centre is Tuesday November 12, 2013, 17:00 CET; confidential distribution of results is targeted for Thursday November 21, 2013, with earliest possible official release of results on December 3, 2013. Please remark the three week turn around time.

OBS!!!! THIS SCHEDULE IS TO BE RATIFIED IN THE NANTES MEETING

Next test international evaluation

The next test run for production, conformation, udder health, longevity, calving, female fertility and workability traits will take place in September 2013.

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 September 3, 2013, 17:00 CET.

PUBLICATION OF INTERBULL ROUTINE RUN
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.