Scientific papers | NAV - Nordic Cattle Genetic Evaluation

2024

Proceedings of the 2024 Interbull Meeting, Bled, Slovenia, 20 – 21 May 2024

Revision of random regression test-day model has improved genomic prediction for Nordic Red dairy cattle

Estimation of variance components for clinical mastitis and somatic cell scores for the Nordic dairy cattle populations

Single-step genomic prediction models for metabolic body weight in Nordic Holstein, Red dairy cattle, and Jersey

Improving single-step genomic prediction reliabilities for clinicalmastitis in Nordic Red dairy cattle and Jerseyby applying marker-specific weights

2023

Multi-breed genetic evaluation of beef bulls used in dairy herds – Emphasis on newest development, Interbull Bulletin 59, August 2023

A computationally efficient method for approximating reliabilities in large-scale single-step genomic prediction, Genetics Selection Evolution, January 2023

2022

Single-step genomic BLUP with many metafounders, Frontiers in Genetics, Sec. Livestock Genomics, November 2022

12th World Congress on Genetics Applied to Livestock Production, July 3 – 8, Rotterdam, The Netherlands

Inbreeding and coancestry trends in Nordic Holstein

Single-step genomic prediction for metabolic body weight of Nordic Red dairy cattle

Single-step genomic prediction in small breeds: Finncattle case.

Avoiding double counting in genomic reliability calculations

Nordic Holstein single-step test day model using metafounders and blending of foreign information

Nordic Holstein single-step test day model using left truncated genomic data, Proceedings of the 2022 Interbull meeting

Nordic genomic prediction for crossbred dairy females, Proceedings of the 2022 Interbull meeting

Modelling metabolic efficiency, ICAR meeting 2022

Single-step genomic BLUP with genetic groups and automatic adjustment for allele coding, Genetics Selection Evolution, June 2022

2021

Single-step genomic evaluation of Russian dairy cattle using internal and external information, Journal of Animal Breeding and Genetics, November 2021

Handling of inbreeding and semen sire breed in the Nordic Holstein fertility evaluations as part of EuroGenomics Harmonization standard, Proceedings of the 2021 Interbull Meeting

Single-step genomic predictions of a minor breed, concurrently with the national genomic evaluations of main breeds, Proceedings of the 2021 Interbull Meeting

Using single-step genetic evaluation for type traits, Interbull Bulletin, Leeuwarden, The Nederlands, April 26 – 30, 2021

Genomic prediction of residual feed intake in the Nordic breeds using data from research herds and 3D cameras in commercial herds, Interbull Bulletin, Leeuwarden, The Nederlands, April 26 – 30, 2021

2020

Easy implementation of QP transformation in ssGTBLUP, EAAP 2020

Integration of MACE breeding values into domestic multi-trait test-day model evaluations , EAAP 2020

Approximating individual animal reliabilities in single-step genomic model, EAAP 2020

Weighted single-step genomic best linear unbiased prediction integrating variants selected from sequencing data by association and bioinformatics analyses, Genetics Selection Evolution, August 2020

Imputation for sequencing variants preselected to a customized low-density chip, Nature Scientific reports, June 2020

2019

Nordic breeding values for beef breed sires used for crossbreeding with dairy dams, Proceedings ICAR Conference 2019, Prague

Bias in estimates of variance components in populations undergoing genomic selection: a simulation study, BMC Genomics, December 2019

Genetic Evaluation for Maintenance Towards Genomic Breeding Values for Saved Feed in Nordic Dairy Cattle, Interbull Bulletin, Cincinnati, Ohio, USA, June 22 – 24, 2019

Genetic parameters for female fertility in Nordic Holstein and Red Cattle dairy breeds, Journal of Dairy Science, July 2019

11th World Congress of Genetics Applied to Livestock Production, February 11 – 16, Auckland, New Zealand

Comparison of ssGBLUP and ssGTBLUP using Nordic Holstein TD data

Genomic evaluation for male fertility in Nordic Red dairy cattle

Estimation of variance components in populations under genomic selection

Genomic prediction for dry matter intake in Nordic Holsteins

Interbull meeting, February 7 – 11, Auckland, New Zealand

Improved genetic evaluation of health traits using metabolic biomarkers in Nordic dairy cattle

Validation of consistency of Mendelian sampling variance, Journal of Dairy Science, March 2018

2017

Validation of genomic and genetic evaluations in 305d production traits of Nordic Holstein cattle, Interbull Bulletin vol. 51

Evaluation of Conception Rate in Nordic Dairy Cattle, Interbull Bulletin vol. 51

EAAP meeting, August 2017 Tallinn, Estonia

Wide-spread adoption of customized genotyping improves European cattle breeding

Validation of genomic and genetic evaluations: Nordic Red Dairy cattle 305 d production traits

Estimation of genetic parameters and heterosis for longevity in crossbred Danish dairy cattle, Journal of Dairy Science, October 2017

Bivariate threshold models for genetic evaluation of susceptibility to and ability to recover from mastitis in Danish Holstein cows, Journal of Dairy Science, October 2017

Association analysis of young stock survival index with imputed whole-genome sequence variants in Nordic Holstein cattle, Journal of Dairy Science, October 2017

Solving efficiently large single-step genomic best linear unbiased prediction models, Journal of Animal Breeding and Genetics, June 2017

2016

Interbull meeting, October 24-28 2016, Puerto Varas, Chile

Youngstock survival in Nordic Cattle Genetic Evaluation

Managing genetic groups in single-step genomic evaluations applied on female fertility traits in Nordic Red Dairy cattle

Genetic correlations for claw health traits between Denmark and The Netherlands

Genotype by environment interaction for the interval from calving to first insemination with regard to calving month and geographic location in Holstein cows in Denmark and Sweden, Journal of Dairy Science, July 2016

Avoiding double counting when deriving economic values through stochastic dairy herd simulation, Livestock Science, May 2016

Seasonality of fertility measured by physical activity traits in Holstein cows, Journal of Dairy Science, April 2016

Effect of cow reference group on validation reliability of genomic evaluation, Animal, January 2016

2015

Single-step genomic model improved reliability and reduced the bias of genomic predictions in Danish Jersey, Journal of Dairy Science, December 2015

Including different groups of genotyped females for genomic prediction in a Nordic Jersey population, Journal of Dairy Science, December 2015

Short communication: Improving accuracy of Jersey genomic evaluations in the United States and Denmark by sharing reference population bulls, Journal of Dairy Science, May 2015

Estrus traits derived from activity measurements are heritable and closely related to the time from calving to first insemination, May 2015

Single-step genomic evaluation using multitrait random regression model and test-day data, Journal of Dairy Science, April 2015

Measurement Error Variance of Test-Day Observations from Automatic Milking Systems, Interbull Bulletin

Sharing reference data and including cows in the reference population improve genomic predictions in Danish Jersey, Animal, September 2015

Genetic parameters for female fertility in Nordic dairy cattle, Interbull bulletin

Across-country test-day model evaluations for Holstein, Nordic Red Cattle and Jersey, Journal of Dairy Science, February 2015

2014

Economic basis for the Nordic Total Merit Index, Journal of Dairy Science, December 2014

10th World Congress of Genetics Applied to Livestock Production, August 17-22, 2014, Vancouver, Canada:

Improving genomic prediction for Danish Jersey using a joint Danish-US reference population

Effect of Cow Reference Group on Validation Accuracy of Genomic Evaluation

A 660-Kb Deletion with Antagonistic Effects on Fertility and Milk Production Segregates at High Frequency in Nordic Red Cattle: Additional Evidence for the Common Occurence of Balancing Selection in Livestock

Haplotype-assisted genomic evaluations in Nordic Red dairy cattle

Bias of genetic trend of genomic predictions based on both real and simulated dairy cattle data

Comparison of Breeding Values from Single-Step and Bivariate Blending Methods

Estrus Traits Derived from Activity Measurements are Heritable and closely related to Conventional Estrus Traits

New simulation method to create data sets with a desired genetic trend

Multivariate outlier detection in genetic evaluation in Nordic Jersey cattle

Genomic relationships based on X chromosome markers and accuracy of genomic predictions with and without X chromosome markers, Genetics Selection Evolution, July 2014

Using the unified relationship matrix adjusted by breed-wise allele frequencies in genomic evaluation of a multibreed population, Journal of Dairy Science, February 2014

A 660-Kb Deletion with Antagonistic Effects on Fertility and Milk Production Segregates at High Frequency in Nordic Red Cattle: Additional Evidence for the Common Occurrence of Balancing Selection in Livestock, PLOS Genetics, January 2014

2013

The estimation of genomic relationships using breedwise allele frequencies among animals in multi-breed populations, Journal of Dairy Science, August 2013

Interbull meeting, August 23-25, 2013, Nantes, France:

Single step evaluations using haplotype segments

Comparison of Model Reliabilities from Single-Step and Bivariate Blending Methods

Simulation Study on Heterogeneous Variance Adjustment for Observations with Different Measurement Error Variance

Comparison of National Genomic Predictions of EuroGenomics Exchanged Young Bulls

Should the Markers on X Chromosome be Used for Genomic Prediction?

Detection of Genomic Pre-Selection with Mendelian Sampling Variance Test

A genetic study of mortality in Danish Jersey heifer calves, Journal of Dairy Science, June 2013

ICAR technical meeting, May 29-31, 2013, Aarhus, Denmark: Recording of data and identification issues

2012

Comparison of genomic predictions using medium-density (∼54,000) and high-density (∼777,000) single nucleotide polymorphism marker panels in Nordic Holstein and Red Dairy Cattle populations, Journal of Dairy Science, August 2012

Interbull meeting, May 28-31, 2012, Cork, Ireland:

Measurement Error Variance of Test-Day Observations from Automatic Milking Systems

Screening for Outliers in Multiple Trait Genetic Evaluation

Validation of consistency of Mendelian sampling variance in national evaluation models

Comparative assessment of methods for estimating genomic relationships and their use in predictions in an admixed population

Single step genomic evaluations for the Nordic Red Dairy cattle test day data

Possibilities of implementing measures from Automatic Milking Systems in routine evaluations of Udder Conformation and Milking Speed

Use of data from electronic milking meters and perspective in use of other objective measures

Comparison on genomic predictions using three GBLUP methods and two single-step blending methods in the Nordic Holstein population, Genetics Selection Evolution, March 2012

Genomic prediction for Nordic Red Cattle using one-step and selection index blending, Journal of Dairy Science, February 2012

2011

Interbull meeting, August 26-28, 2011, Stavanger, Norway:

Estimation of GEBVs using deregressed individual cow breeding values

Genetic Evaluation of Claw Health in Denmark, Finland and Sweden

Simulation study on Mendelian sampling variance tests

Genomic prediction using high-density SNP markers in Nordic Holstein and Red

2010

World Congress on Genetics Applied to Livestok Production, August 1-6, 2010, Leipzig, Germany:

Use of bivariate EBV-DGV model to combine genomic and conventional breeding value evaluations

Heterogeneous Variance Adjustment in Across-Country Genetic Evaluation with Country-Specific Heritabilities

Interbull meeting, June 1-3, 2010, Riga, Latvia:

A recipe for multiple trait deregression

Combining test day SCS with clinical mastitis and udder type traits: A random regression model for joint genetic evaluation of udder health

2009

Interbull meeting, August 21-24, 2009, Barcelona, Spain:

Relation between accuracies of genomic predictions and ancestral links to the training data

Joint Nordic Genetic Evaluation of Growth and Carcass traits in Dairy Breeds

Estimation of Parameters for Heterogeneous Variance Adjustment on Test-Day Data

Estimation of variance components for Nordic red cattle test-day model: Bayesian Gibbs sampler vs. Monte Carlo EM REML

2008

Joint Genetic Evaluation of Other Disease Traits in Denmark, Finland and Sweden

Intebull meeting, June 16-19, 2008, Niagara Falls, NY, USA: Strategy for estimation of variance components for the joint Nordic yield evaluation

2007

EAAP, August 2007, Dublin, Ireland:

Predictive ability of different models for clinical mastitis in joint genetic evaluation for Sweden, Denmark and Finland

Interbull meeting, August 23-25, 2007, Dublin, Ireland:

Genetic Evaluation of Calving Traits in Denmark, Finland, and Sweden

Locomotion as a New Trait First Results from Denmark

Experiences with Interbull test IV estimation of genetic variance

2006

8th World Congress on Genetic Applied to Livestock Production, August 13-18, 2006, Belo Horizonte, Brazil:

Random Heterosis and Recombination Loss Effects in a Multibreed Evaluation for Nordic Red Dairy Cattle

ICAR meeting, June 7-10, 2006, Kuopio, Finland:

Composite traits and International genetic evaluation

Improving the health traits by recording and evaluation

Interbull meeting, June 4-6, 2006, Kuopio, Finland:

Genetic Evaluation of Udder Health Traits for Denmark, Finland and Sweden

Joint Nordic Test Day Model: Variance Components

Swedish Sire Evaluation of Hoof Diseases Based on Hoof Trimming Records

Joint Nordic Test Day Model Evaluation Model

Joint Nordic Test Day Model: Experiences with the New Model

2005

Interbull meeting, June 2-4, 2005, Uppsala, Sweden:

Model validation using individual daughter deviations – statistical power

2004

Interbull meeting, May 29-31, 2004, Sousse, Tunisia:

A joint Nordic model for type traits Joint Nordic test day model for milk production traits

A joint Nordic model for type traits

2002

Baltic animal breeding congress 2002:

Joint Nordic genetic evaluation of dairy cattle

7th World Congress on Genetics Applied to Livestock Production, August 19-23, 2002, Montpellier, France:

Combining test day and full lactation records in prediction of breeding values