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Updated: May 16, 2026

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
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Technical note: Changes to herd cutoff date in conception rate evaluations.

J L Hutchison1, P M VanRaden, H D Norman

  • 1Animal Improvement Programs Laboratory, Agricultural Research Service, US Department of Agriculture, Beltsville, MD 20705-2350, USA. Jana.Hutchison@ars.usda.gov

Journal of Dairy Science
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Service-sire conception rate (SCR) evaluations were improved by implementing herd-specific cutoff dates. This change enhances the accuracy of conception rate calculations for dairy cattle breeding programs.

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Area of Science:

  • Dairy Cattle Reproduction
  • Animal Breeding and Genetics
  • Reproductive Management

Background:

  • Service-sire conception rate (SCR) evaluations were established in the U.S. in 2008, using a fixed 70-day pre-submission deadline for insemination records.
  • Previous SCR methods used a constant cutoff date, potentially misrepresenting conception opportunities due to varying herd testing schedules.

Purpose of the Study:

  • To evaluate the impact of modifying SCR calculation edits to incorporate herd-specific cutoff dates.
  • To assess the accuracy and stability of conception rate evaluations after implementing new edits.

Main Methods:

  • Implemented a change in SCR edits in April 2012, requiring inseminations to occur at least 70 days before the last herd test date, rather than a fixed submission deadline.
  • Applied similar edits to heifer conception rate (HCR) and cow conception rate (CCR) data in August 2012, utilizing herd-specific cutoff dates.
  • Analyzed correlations, means, and standard deviations of SCR, HCR, and CCR before and after the edit implementation.

Main Results:

  • Correlations between pre- and post-edit SCR were high (0.96 for Holsteins), with minimal changes in mean or standard deviation.
  • Weekly mean conception rates became more stable for recent inseminations after the edit change.
  • Conception rates at 10 weeks prior to the relevant date showed a decrease from 60% (pre-edit) to 42% (post-edit), indicating a more precise measurement.

Conclusions:

  • The revised edits for SCR, HCR, and CCR improve evaluation accuracy by accounting for herd-specific pregnancy diagnosis opportunities.
  • Herd-specific cutoff dates provide a more precise measure of conception rates, crucial for effective dairy cattle breeding programs.
  • These methodological improvements enhance the reliability of genetic selection based on reproductive traits.