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Related Experiment Videos

Genetic parameters for testosterone production in boars.

D Lubritz1, B Johnson, O W Robison

  • 1North Carolina State University, Raleigh 27695-7621.

Journal of Animal Science
|August 1, 1991
PubMed
Summary

Selecting for larger testes size or higher testosterone production in Duroc boars can improve growth performance. Testes measurements are reliable indicators of testosterone levels and growth traits, suggesting selection for size is effective.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Quantitative Genetics

Background:

  • Testosterone production and testes size are crucial reproductive and growth traits in livestock.
  • Understanding the genetic correlations between these traits is essential for effective breeding programs.
  • Previous research has explored these relationships, but further investigation in Duroc boars is warranted.

Purpose of the Study:

  • To estimate genetic parameters for testosterone production and testes measurements in Duroc boars.
  • To determine the genetic correlations between testosterone production, testes size, and growth traits.
  • To evaluate the potential of using testes size as a predictor for testosterone levels and growth performance.

Main Methods:

  • Data from 66 sires and 358 Duroc boars collected between 1982-1989.

Related Experiment Videos

  • Measurement of peripheral testosterone levels before and after GnRH challenge.
  • Collection of data on testes length, width, volume, birth weight, average daily gain, days to 104 kg, and backfat.
  • Utilized son-sire regressions to calculate heritabilities and genetic correlations.

    • Main Results:

    • Heritability estimates ranged from 0 for backfat to 0.42 for average daily gain.
    • Significant positive genetic correlations were observed between testosterone production (PRE and POST) and testes measurements (TL168, TW168, TVOL).
    • Testes measurements showed strong positive genetic correlations with growth traits (ADG, DAYS104).

    Conclusions:

    • Testes measurements are effective predictors of both basal and challenge testosterone levels in Duroc boars.
    • Selection for increased testes size or testosterone production is expected to enhance growth.
    • Selection for testes size may lead to greater improvements in growth traits compared to selection for testosterone levels alone.