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Endocrine differences in rams after genetic selection for testis size.

J R McNeilly, M Fordyce, R B Land

    Journal of Reproduction and Fertility
    |January 1, 1986
    PubMed
    Summary
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    Genetic selection for larger testes in ram lambs influences growth and hormone levels. High-testis lines show altered follicle-stimulating hormone (FSH) and luteinizing hormone (LH) concentrations, indicating genetic differences in pituitary and hypothalamic activity.

    Area of Science:

    • Animal Science
    • Reproductive Biology
    • Genetics

    Background:

    • Selective breeding impacts livestock traits.
    • Testis size is a key indicator of male reproductive potential in sheep.
    • Hormonal regulation of testis development is complex and influenced by genetics.

    Purpose of the Study:

    • To investigate the effects of genetic selection for high (H) and low (L) testis size on growth and reproductive hormone profiles in ram lambs.
    • To explore the relationship between testis growth, body weight, and pituitary hormone concentrations (LH, FSH) in selected lines.
    • To examine the impact of hemicastration on testis growth rates and hormonal responses in H and L line lambs.

    Main Methods:

    • Longitudinal measurements of testis diameter and body weight from 6 to 76 weeks of age.

    Related Experiment Videos

  • Measurement of plasma luteinizing hormone (LH), follicle-stimulating hormone (FSH), and testosterone concentrations.
  • Surgical manipulation including castration at birth and hemicastration at 6 weeks of age.
  • Comparative analysis between high (H) and low (L) testis size selected lines.

    • Main Results:

    • The H line exhibited greater testis growth but lower body weight compared to the L line.
    • Significant differences in FSH and LH concentrations were observed between lines, particularly after puberty and in castrated lambs.
    • Hemicastration stimulated compensatory testis growth in L line lambs, but not in H line lambs, suggesting line-specific regulatory mechanisms.

    Conclusions:

    • Genetic selection for testis size is associated with distinct endocrine profiles and growth patterns in ram lambs.
    • Underlying genetic differences in pituitary and/or hypothalamic function contribute to variations in testis development and hormonal regulation.
    • These findings provide insights into the genetic control of reproductive traits and potential strategies for breeding programs.