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AbstractFull Text

Recent changes in U.S. breeding programs that resulted from the implementation of genomic evaluation were documented. In 2013, over 146 000 females and 20 000 males were genotyped in the United States. Mean number of U.S. bulls that entered artificial insemination (AI) service from 2008 to 2013 was ...

Author(s)
Norman, H. D.; Wright, J. R.; Hutchison, J. L.; Mattison, J. M.
Publisher
Interbull Centre, Uppsala, Sweden
Citation
Interbull Bulletin, 2014, No.48, pp 37-39
Abstract

The availability of genomic evaluations since 2008 has resulted in many changes to dairy cattle breeding programs. One such change has been the increased contribution of young bulls (0.8 to 3.9 yr old) to those programs. The increased use of young bulls was investigated using pedigree data and...

Author(s)
Hutchison, J. L.; Cole, J. B.; Bickhart, D. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 5, pp 3213-3220
Abstract

The objectives of this research were to assess the utility of multiple services, rather than first service only, and an expanded service sire term for prediction of bull conception rate (CR) by artificial insemination in the United States. The intent with the expanded service sire term was to...

Author(s)
Kuhn, M. T.; Hutchison, J. L.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 6, pp 2481-2492
Abstract

Voluntary waiting period and adoption of synchronized breeding (ovulation synchronization followed by timed artificial insemination) were characterized from 33 million services of Holsteins and Jerseys in Dairy Herd Improvement herds. Calving month, calving year, and parity had large effects on...

Author(s)
Miller, R. H.; Norman, H. D.; Kuhn, M. T.; Clay, J. S.; Hutchison, J. L.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2007, 90, 3, pp 1594-1606
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