Minutes from Interbeef Technical Committee Meeting

Nantes, August 27, 2013
La Cité Nantes Events Centre

Participants

Brian Wickham (WG Chairman), Lubos Vostry, Pavel Bucek, Zdenka Vesela, Clara Diaz Martin, Eric Venot, Ross Evans, Thierry Pabiou, Anders Fogh, Mohammad Nilforooshan, João Dürr, Laurent Griffon, Peter Amer (observer), Mike Coffey, Norman Maiwashe, Ludmila Zavadilová (observer), Gerben de Jong (observer), Amandine Launay and Andrew Cromie.

1 & 2. Opening and adoption of agenda

The Interbeef Chairman, João Dürr, welcomed all the participants. The agenda was accepted with one addition to the other matters: Mohammad Nilforooshan requested space to report on the impact of the agreed publication rules on the number of animals to be published.

ADOPTED AGENDA

1. Opening
2. Adoption of agenda

3. Minutes from meeting in Aarhus – May 27, 2012 (https://wiki.interbull.org/public/IBeef_Tech_Meet_Aarhus?action=print)

4. Results from the survey on “Assessment of genetic parameter estimation procedures for weaning weight and inclusion of records from crossbred animals” (IRL)
5. Results from AWW variance components study (IRL)
6. September 2013 AWW routine run
   1. Genetic parameters?
   2. Inclusion of new countries in AWW evaluations
7. Preliminary results from the calving traits pilot run (CZE)
8. Technical Committee terms of reference
9. Other matters
10. Recommendations to the working group
11. Adjourn

3. Minutes from meeting in Aarhus

Eric Venot made the following remarks on the minutes:

• What should be done about animals that change sex or breed from one evaluation to the next?
  • Explanation: each authoritative organization is responsible for the quality of the information added to the Interbeef pedigree and changes made by the authoritative organization cannot be reverted by other users.
• Should animals that are considered "invalid" by the authoritative organization be included in the evaluations?

  • Recommendation: the Interbull Centre will investigate which animals are in such situation and the impact of removing these animals from the evaluation.

4. Results from the survey

Ross Evans presented the summary of the answers provided by the respondents. The survey provided a valuable description of the national procedures for variance component estimation, as well as the use of crossbred data. The presentation of the results are available at Survey_slides.pdf.

5. Results from AWW variance components study

Thierry Pabiou presented the results from the study on AWW LIM variance components carried out by the ICBF team. There was not enough time to finish the analyses for CHA before the meeting. The written report is available at INTERBEEF ACROSS COUNTRY VCE LIMOUSIN v5.pdf. The technical committee discussed the results and the main comments were:

• Results are quite different between DMU and Mix99, and the MTT researchers are looking into it to see why this is the case. DMU has therefore been adopted for the study and should be the software of choice for variance components until further notice.
• Investigate if "invalid IDs" occur among common bulls
• Pruning non-informative animals can reduce the number of equations substantially
• Defining phantom groups should be considered
• Prior to bending the matrix of correlations, add the weighted average of the correlations that converged in the empty cells instead of 0.80
• Since there are so many non-estimable correlations, one possibility would be to consider all correlations as 1 (no genotype-environment interaction) for the time being and concentrate efforts on modelling the heterogeneous variance
• It is probably best to consider the maternal effects as 1 because they are even more difficult to estimate than the direct genetic effects
• In general, the technical committee considered that the study yielded consistent results and progress has been made

Recommendations for continuing the study:

• Use trios of countries including FRA as the link supplier
• Set maternal genetic effect to 1
• Prune non-informative animals
• Improve bending
• Add phantom groups
• Try to "fix" variances to the values supplied by the national centers

6. September 2013 Routine Run

Given that the research on variance components is still ongoing and the previously estimated components are not considered acceptable by the technical committee, the question posted to the group was if the September 2013 routine run for AWW should be postponed or changed into a test run. Mike Coffey and Clara Diaz reported that it has become very difficult to ensure funding to Interbeef without results being delivered to the breeders and that it would be a bad policy to cancel the routine run again. It was finally agreed that the routine run should be maintained with the parameters estimated by the ICBF team, who committed to speed up the procedures for CHA immediately following this meting. Recommendations:

• Maintain the September 2013 rotine run, scheduled for Sep 17, 2013
• Use the same phenotypic data already used for the last test run (no new performance records should be submitted by the participating organizations)
• Pedigrees should be updated by the national centers
• Adopt the bended correlation matrices prepared by the ICBF research group
• Apply the publication criteria as approved by the WG in May 2013 to prepare the distribution files

Obs. Ross Evans will contact all users to collect extra information about national variance components

7. Preliminary results from the calving traits pilot run