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Related Experiment Videos

Predicting end-of-test semen quality in bulls prior to performance testing.

J A Thompson1, S E Wikse, D W Forrest

  • 1Department of Large Animal Medicine and Surgery Texas A&M University, College Station, Texas 77843, USA.

Theriogenology
|May 1, 1997
PubMed
Summary

Predicting bull semen quality is challenging. While hormone levels showed low predictability, scrotal circumference at the start of testing emerged as the most reliable indicator for end-of-test semen quality in bulls.

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Area of Science:

  • Veterinary Science
  • Animal Reproduction
  • Endocrinology

Background:

  • Predicting semen quality in bulls is crucial for artificial insemination programs and herd management.
  • Hormonal profiles and clinical measurements at the start of performance testing are potential indicators of future reproductive success.

Purpose of the Study:

  • To determine if serum hormone concentrations (testosterone, progesterone, androstenedione) at the start of bull performance testing can predict end-of-test semen quality.
  • To evaluate other clinical measurements (breed, age, body weight, hip height, scrotal circumference) for their predictive value regarding end-of-test semen quality.

Main Methods:

  • Multivariate analysis was used to assess the predictive power of serum hormone concentrations and clinical measurements.
  • Sensitivity and specificity were calculated for various scrotal circumference cut-points to evaluate their effectiveness in predicting semen quality.

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Main Results:

  • End-of-test semen quality was associated with initial steroid concentrations and pre-testing measurements like age, body weight, hip height, and scrotal circumference (SC).
  • A multivariate model combining three steroid concentrations had low predictive accuracy (sensitivity 0.6, specificity 0.5) and poor repeatability (r² = 0.16).
  • In multivariate analyses, only breed and start-of-test SC remained significant predictors (P < 0.05) of end-of-test semen quality, with SC being the most accurate predictor. No specific scrotal circumference cut-point achieved both adequate sensitivity and specificity.

Conclusions:

  • Serum hormone concentrations at the start of performance testing are not reliable predictors of end-of-test semen quality in bulls.
  • Start-of-test scrotal circumference is the most accurate single predictor of end-of-test semen quality.
  • Combining clinical tests did not improve predictive accuracy due to correlations between variables, and no specific threshold for scrotal circumference demonstrated sufficient predictive power.