INTERBULL Routine Genetic Evaluation for Dairy Production Traits

February 1999



The eleventh routine international evaluation for dairy production traits took place as scheduled at the Interbull Centre. Data from twenty two (22) countries were included in this evaluation. Results were distributed on February 8, 1999, to designated representatives in twenty three (23) countries currently subscribing to the service. International genetic evaluations for milk, fat and protein yields of bulls from Canada, Germany, Denmark, Finland, France, Italy, the Netherlands, Norway, Sweden, the United States of America, Switzerland, the United Kingdom, New Zealand, Australia, Austria, Belgium, Ireland, Spain, the Czech Republic, Slovenia, Estonia and Israel were computed. Ayrshire, Brown Swiss, Guernsey, Holstein, Jersey and Simmental breed data from 8, 10, 4, 22, 7 and 8 bull populations, respectively, were included in this evaluation.

New data (national genetic evaluations) included in this evaluation:

Changes in the INTERBULL evaluation:

Data and method of analysis

Data were national genetic evaluations of AI sampled bulls with daughters in at least 10 herds. Table 1 presents the type and amount of data included in this Interbull evaluation. The difference between "No. Records" and "No. Bulls" is explained by common bulls with proofs in more than one country. The entry "Publishable Proofs" reflects bulls whose international evaluations were distributed to service customers. The difference between "No. Bulls" and "Publishable Proofs" is explained by bulls not meeting the minimum criterion for official publication in the country of origin.

Estimated genetic parameters are shown in APPENDIX I. Parameters are listed by breed, trait, and country.

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. Different breeds were analysed separately. Heritability estimates used in both the de-regression and international evaluation were as in each country's national evaluation (Table 1).

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. Small groups (generally consisting of less than 10 bull) were combined.

Scientific literature

The international genetic evaluation procedure is based on international work described in the following scientific publications:

1. International genetic evaluation computation

L. Schaeffer. 1994. J. Dairy Sci. 77:2671-2678

2. Genetic trend validation

D. Boichard et al. 1995 J. Dairy Sci. 78:431-437

3. De-regression and genetic parameter estimation

A. Sigurdsson and G. Banos. 1995. Acta Agric. Scand. 45:207-219

A. Sigurdsson et al. 1996. Acta Agric. Scand. 46:129-136

P. Rozzi and L. Schaeffer. 1996. Interbull Technical Workshop, Verden, Germany, 25-26 Nov

4. Data edits

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

5. International reliability estimation

B. Harris and D. 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 may only be used for internal purposes.

Use of INTERBULL evaluations in various countries

Table 2 presents current national policies regarding use of Interbull evaluations in countries participating with data. These statements do not provide permission to any country for publication of international evaluations expressed on the scale of another country. Publication references pertain to each country's own scale.

Table 3 shows release dates of national and Interbull evaluation results in various countries.

INTERBULL conversions

Since all data are now becoming available, conversions are not as useful as before. When an international proof is available, customers of the service are encouraged to use this instead of a converted proof. Conversion coefficients were, however, computed from international evaluation results and may be considered "Estimated Interbull Conversions" for the interim until the next international evaluation run.

Next routine international evaluation

The next routine international evaluation is scheduled for May 1999. New data for that run should reach the Interbull Centre not later than April 30, 1999; in any case, the most recently received data will be considered. Results will be distributed on May 10, 1999.

Next test international evaluation

The next test international evaluation is scheduled for March 1999. Countries wishing to enter the system for the first time or planning to submit new information (modified national evaluation procedure, new breeds etc) for the following routine evaluation must have their data tested in this test-run. Deadline for sending new data to the Interbull Centre for the next test-run is March 1, 1999.

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 in diskettes.

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;







Table 1. National evaluation data considered in the Interbull evaluation for dairy production traits (February 1999)
National evaluation Number of records by breed




heritability 2


Ayrshire Swiss Guernsey Holstein Jersey Simmental
Canada 2-99 .31-.42 AM TD 311 48 50 4142 190
Germany 1-99 .35-.37 AM TD 7179
Germany 2-99 .26-.30 AM MT 1651 8936
Denmark 1-99 .30 AM 1461 4032 1404
Finland 1-99 .30 AM 2625 539
France 1-99 .30 AM 133 7520 1886 ***
France 1-99 .30 AM 147 ****
Italy 1-99 .30 AM 2968
Italy 1-99 .26-.29 AM 642
Italy 1-99 .29-.33 AM 427
Netherlands 1-99 .35 AM 34 5116 23
Norway 6-98 .20 SM 2061
Sweden 1-99 .25 SM 2573 1329
Unit. States 2-99 .30 AM 236 364 551 15653 1445
Switzerland 10-98 .25-.29 AM 425 *
Switzerland 1-99 .32-.33 AM 1371
Switzerland 10-99 .34-.38 AM 408 ** 1626
Unit. Kingdom 1-99 .35 AM 207 87 2247 172
New Zealand 1-99 .28-.35 AM 563 2501 1977
Australia 12-98 .25 AM 285 76 2811 623
Austria 1-99 .27-.30 AM MT 1173 256 2998
Belgium 1-99 .30 AM 624
Ireland 1-99 .35 AM 647
Spain 1-99 .25 AM 584
Czech Rep. 1-99 .23-.24 AM MT 1120 4834
Slovenia 1-99 .25 SM 160 62 245
Estonia 1-99 .23-.24 AM MT 417
Israel 9-98 .25 AM 500
No. Records 8861 6989 764 61080 5834 21099
No. Bulls 9226 6467 703 55829 5354 20262
Publishable Proofs 8583 6398 701 54725 5335 19904

AM=Animal Model;  AM MT=Animal Model with lactations as correlated traits;

AM TD= Animal Test Day Model;  SM=Sire/Maternal Grandsire Model

* Swiss Black & White Holstein in the Holstein evaluation of Interbull

** Swiss Red Holstein in the Holstein evaluation of Interbull

*** French Montbeliarde in the Simmental evaluation of Interbull