R L Powell

Summary

Affiliation: Agricultural Research Service
Country: USA

Publications

  1. ncbi Stability of genetic evaluations for active artificial insemination bulls
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 87:2614-20. 2004
  2. ncbi International dairy bull evaluations expressed on national, subglobal, and global scales
    R L Powell
    Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705 2350, USA
    J Dairy Sci 85:1863-8. 2002
  3. ncbi Accuracy and stability of national and international somatic cell score evaluations
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:2624-31. 2005
  4. ncbi Progeny testing and selection intensity for Holstein bulls in different countries
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 86:3386-93. 2003
  5. ncbi Major advances in genetic evaluation techniques
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 89:1337-48. 2006
  6. ncbi Impact of estimated genetic correlations on international evaluations to predict milk traits
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:3679-87. 2005
  7. ncbi Accuracy of foreign dairy bull evaluations in predicting United States evaluations for yield
    R L Powell
    Animal Improvement Programs Laboratory, ARS, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 87:2621-6. 2004
  8. ncbi Impact of maturity rate of daughters on genetic ranking of Holstein bulls
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:3337-45. 2005
  9. ncbi Effectiveness of national and regional sire evaluations in predicting future-daughter milk yield
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705, USA
    J Dairy Sci 88:812-26. 2005
  10. ncbi Consistency of maturity rate for milk yield across countries and generations
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 90:3937-44. 2007

Detail Information

Publications14

  1. ncbi Stability of genetic evaluations for active artificial insemination bulls
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 87:2614-20. 2004
    ..Declines in estimated merit over time are not sufficient to alter present genetic selection programs, but reasons for the declines continue to elude explanation...
  2. ncbi International dairy bull evaluations expressed on national, subglobal, and global scales
    R L Powell
    Agricultural Research Service, United States Department of Agriculture, Beltsville, MD 20705 2350, USA
    J Dairy Sci 85:1863-8. 2002
    ..If conditions in non-participating countries are generally represented by participating countries, most needs are met by a global scale...
  3. ncbi Accuracy and stability of national and international somatic cell score evaluations
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:2624-31. 2005
    ..747 vs. 0.714) for IB01 than for US01. For bulls with added US daughters, correlation with US04 was also higher for IB01 than US01, showing that inclusion of foreign data improved predictive value of SCS evaluations...
  4. ncbi Progeny testing and selection intensity for Holstein bulls in different countries
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 86:3386-93. 2003
    ..All but one country showed positive selection for udder support. These statistics permit comparison of the components of PT programs across country, illustrating possible opportunities for improvement...
  5. ncbi Major advances in genetic evaluation techniques
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 89:1337-48. 2006
    ..The collection and analysis of industry-wide data to evaluate genetic merit will continue to be the most important tool for genetic progress into the foreseeable future...
  6. ncbi Impact of estimated genetic correlations on international evaluations to predict milk traits
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:3679-87. 2005
    ..Estimated genetic correlations improved the prediction of future national evaluations slightly in most countries but more substantially for the evaluations and bulls of Australia and New Zealand...
  7. ncbi Accuracy of foreign dairy bull evaluations in predicting United States evaluations for yield
    R L Powell
    Animal Improvement Programs Laboratory, ARS, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 87:2621-6. 2004
    ....
  8. ncbi Impact of maturity rate of daughters on genetic ranking of Holstein bulls
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 88:3337-45. 2005
    ..Results suggested that a modification to the current evaluation model to account for maturity rate should reduce fluctuations in individual bull PTA across time and may improve accuracy of evaluations...
  9. ncbi Effectiveness of national and regional sire evaluations in predicting future-daughter milk yield
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705, USA
    J Dairy Sci 88:812-26. 2005
    ..Reliance on regional rather than national evaluations would reduce current US genetic gains...
  10. ncbi Consistency of maturity rate for milk yield across countries and generations
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 90:3937-44. 2007
    ....
  11. ncbi Overview of progeny-test programs of artificial-insemination organizations in the United States
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 84:1899-912. 2001
    ..Percentage of PT daughters that were registered declined and was 19% for Holsteins and around 80% for other breeds...
  12. ncbi Performance of Holstein clones in the United States
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 87:729-38. 2004
    ..For ETS clones with confirmed identical genotypes, identical genetic merit should be assigned...
  13. ncbi Investigation of country bias in international genetic evaluations using full-brother information
    R L Powell
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 91:2885-92. 2008
    ..Causes of those differences are unknown; differences in incorporation of parental data in national and International Bull Evaluation Service evaluations are a possibility...
  14. ncbi Timeliness and effectiveness of progeny testing through artificial insemination
    H D Norman
    Animal Improvement Programs Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705 2350, USA
    J Dairy Sci 86:1513-25. 2003
    ..More extensive and rapid sampling and increased selection intensity of PT programs have led to more rapid genetic progress. More extensive use of AI could increase US producer income by millions of dollars annually...