Interbull genomic evaluation of small Holstein populations: InterGenomics-Holstein (IG-HOL)
In December 2020 Interbull Centre launched a new Service for the international genomic evaluation of small Holstein populations: “InterGenomics-Holstein” (IG-HOL). The IG-HOL Service’s principles are to: a) have two categories of participants: IG-HOL countries (small Holstein populations’ countries), and “Contributors” (larger Holstein populations’ countries); b) pool genotypes provided by both participation categories creating a unique reference population (without sharing any genotypes among participants); c) predict gEBVs on each specific IG-HOL country-trait combination scale (for the traits evaluated in the Interbull MACE Service), by adapting to Holstein specificities the methodology used in the Interbull InterGenomics Brown Swiss Service; d) apply the Interbull method for approximating genomic reliabilities.
In the IG-HOL December 2020 routine run 12 280 male genotypes submitted by 4 IG-HOL countries (IRL, ISR, KOR, SVN) and 4 Contributors (DEU, DFS, FRA, PRT) were used in the genomic evaluation of 30 traits predicting gEBVs for 89 IG-HOL country-trait combinations. The size of the pooled reference population ranged from 4 645 bulls (body condition score - conformation trait) to 7 544 bulls (milk, fat, and protein - production traits). As expected, for reference bulls the predicted IG-HOL gEBVs showed high correlations with MACE EBVs, while lower correlations were observed for young bulls comparing their IG-HOL gEBVs to MACE PAs. The reliability gain was satisfactory, with an average increase across all 30 traits of +0.22 for young bulls’ genomic reliabilities vs the MACE PAs’ reliabilities.
These results show that IG-HOL is a valuable Service, especially for countries with small Holstein populations which cannot benefit from being part of large international genotype-exchange consortia.
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).