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Related Experiment Videos

Fertility indices for beef bulls.

V Perry1, P J Chenoweth, T B Post

  • 1Department of Farm Animal Medicine and Production, University of Queensland, Goondiwindi.

Australian Veterinary Journal
|January 1, 1990
PubMed
Summary

Beef bull fertility can be predicted using specific traits. Fertility indices, derived from traits like hormone levels and physical characteristics, accurately correlate with reproductive success, regardless of bull genotype.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Genetics

Background:

  • Assessing beef bull fertility is crucial for efficient cattle breeding programs.
  • Understanding the influence of genotype on reproductive traits is essential for genetic selection.
  • Predictive models for bull fertility can optimize breeding strategies and improve herd productivity.

Purpose of the Study:

  • To develop and validate fertility indices for young beef bulls.
  • To identify key reproductive and production traits that predict bull fertility.
  • To assess the correlation between fertility indices and actual bull reproductive performance across different genotypes.

Main Methods:

  • Studied 6 different beef bull genotypes (16-30 months old) over various mating intervals.

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  • Utilized non-orthogonal analyses of variance and covariance to derive fertility indices.
  • Multiple regression equations were employed with pregnancy rate as the dependent variable.

    • Main Results:

    • Both "among" and "within" genotype fertility indices showed significant correlations with pregnancy rate.
    • "Within" genotype fertility indices demonstrated strong predictive power at multiple time points prior to mating (e.g., r = 0.89 at 8 months).
    • Key traits for fertility indices included peripheral LH levels post-GnRH stimulation, testicular volume, libido, and body weight.

    Conclusions:

    • Fertility indices derived from specific traits are reliable predictors of beef bull reproductive performance.
    • These predictive indices were robust across different bull genotypes.
    • The identified traits offer valuable targets for improving beef bull selection and breeding programs.