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Mohammed Abdallah Ahmed, Sallam, 2020. International genomic evaluation of Brown Swiss and Holstein dairy cattle : multi-trait vs. single-trait approach. Second cycle, A2E. Uppsala: SLU, Dept. of Animal Breeding and Genetics



International genomic evaluation for Brown Swiss population known as InterGenomics, was officially launched in 2011 by Interbull Center in Uppsala, Sweden. The routine evaluation is currently carried out using a single-trait approach where estimated breeding value from multi-trait across countries evaluation (MACE EBV) are used as a dependent variable and genetic corre-lations are assumed to be equal to one between countries. The current study is exploring a multi-trait approach as an alternative to the routine one. This approach uses the estimated breeding value (EBV) from the national genetic evaluations as a dependent variable and make use of the genetic correlations estimated between countries as well. In this study, we compared reliability from both approaches for Brown Swiss (BSW) and Holstein (HOL) dairy cat-tle in traits with different heritabilities. Findings show that single-trait ap-proach resulted in higher reliability than multi-trait approach. There were some cases where multi-trait approach showed a small gain in evaluations variance for traits where heritability and genetic correlations were low. Fur-ther work may be required to check the extent of bias that could exist in both approaches.

Main title:International genomic evaluation of Brown Swiss and Holstein dairy cattle
Subtitle:multi-trait vs. single-trait approach
Authors:Mohammed Abdallah Ahmed, Sallam
Supervisor:Strandberg, Erling and Benhajali, Haifa
Examiner:de Koning, Dirk-Jan
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2020
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:VM006 Animal Science - Master's Programme
Supervising department:(VH) > Dept. of Animal Breeding and Genetics
Keywords:Genotype-based international genomic evaluation, single trait, multi-trait, reliability, MACE proofs, national proofs, selection index, Brown Swiss, Holstein, Gene by environment interaction
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Subject. Use of subject categories until 2023-04-30.:Animal genetics and breeding
Deposited On:12 Nov 2020 11:40
Metadata Last Modified:13 Nov 2020 02:02

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