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AbstractFull Text

The first U.S. dairy cattle genomic evaluation was released in April 2008. Since then, the number of animals genotyped per year has rapidly increased. The over 2 million genotypes currently stored, have increased by nearly 500,000 (90/10% ratio for female and male animals, respectively) added...

Author(s)
Nicolazzi, E. L.; Dürr, J. W.; Wiggans, G. R.
Publisher
Interbull Centre, Uppsala, Sweden
Citation
Interbull Bulletin, 2018, No.53, pp 54-56
Abstract

The intensive selection programs for milk made possible by mass artificial insemination increased the similarity among the genomes of North American (NA) Holsteins tremendously since the 1960s. This migration of elite alleles has caused certain regions of the genome to have runs of homozygosity...

Author(s)
Kim, E. S.; Cole, J. B.; Huson, H.; Wiggans, G. R.; Tassell, C. P. van; Crooker, B. A.; Liu, G.; Da, Y.; Sonstegard, T. S.
Publisher
Public Library of Sciences (PLoS), San Francisco, USA
Citation
PLoS ONE, 2013, 8, 11, pp e80813
Abstract

Implementation of genomic evaluation has caused profound changes in dairy cattle breeding. All young bulls bought by major artificial insemination organizations now are selected based on such evaluation. Evaluation reliability can reach approximately 75% for yield traits, which is adequate for...

Author(s)
Wiggans, G. R.; VanRaden, P. M.; Cooper, T. A.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2011, 94, 6, pp 3202-3211
AbstractFull Text

The United States and Canada have collaborated in developing genomic evaluations that utilize genotypes obtained from high-density single-nucleotide polymorphism (SNP) chips. The DNA for genotyping was obtained from semen from 7 major artificial-insemination (AI) companies in North America through...

Author(s)
Wiggans, G. R.; Sonstegard, T. S.; VanRaden, P. M.; Matukumalli, L. K.; Schnabel, R. D.; Taylor, J. F.; Chesnais, J. P.; Schenkel, F. S.; Tassell, C. P. van
Publisher
International Committee for Animal Recording (ICAR), Roma, Italy
Citation
ICAR Technical Series, 2009, No.13, pp 347-353
Abstract

The overall object of this research was to characterize US Holstein (virgin) heifer fertility. This included investigation of factors influencing heifer fertility and estimation of heritability, as well as correlations with cow fertility and first-lactation milk yield. A secondary objective was to...

Author(s)
Kuhn, M. T.; Hutchison, J. L.; Wiggans, G. R.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2006, 89, 12, pp 4907-4920

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