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Related Experiment Videos

Luteinizing hormone in nutrient-restricted ovariectomized ewes.

W R Tatman1, M B Judkins, T G Dunn

  • 1University of Wyoming, Laramie 82071.

Journal of Animal Science
|April 1, 1990
PubMed
Summary

Undernutrition in ovariectomized ewes significantly reduced luteinizing hormone (LH) release, particularly in severely thin animals. This highlights the impact of nutritional status on reproductive hormone secretion.

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Area of Science:

  • Reproductive Endocrinology
  • Animal Science
  • Nutritional Physiology

Background:

  • Undernutrition is known to affect reproductive functions in various species.
  • Previous studies indicated diminished pulsatile secretion of luteinizing hormone (LH) with prolonged undernutrition in ewes.
  • Hormonal profiles, including LH and GnRH receptor dynamics, require further elucidation in nutritionally stressed ewes.

Purpose of the Study:

  • To evaluate serum LH concentrations, pituitary LH and GnRH receptor content, and hypothalamic GnRH content in undernourished, ovariectomized ewes.
  • To investigate the relationship between nutritional status and LH secretion patterns.
  • To assess the impact of varying dietary energy levels on reproductive hormone parameters.

Main Methods:

  • Ovariectomized ewes were fed either maintenance (100% NRC) or low-energy (60% NRC) diets.

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  • Ewes were categorized based on body condition scores (CS) at the end of the study.
  • Blood samples were collected for LH analysis at baseline and prior to slaughter; tissue samples were analyzed for hormone and receptor content.

    • Main Results:

    • Serum LH concentrations did not differ initially across groups.
    • Ewes with severe undernutrition (CS ≤ 2) lost significantly more weight (42%) compared to moderately undernourished ewes (CS ≥ 3, 18%).
    • Significantly reduced basal and mean LH concentrations were observed in severely undernourished ewes (CS ≤ 2) compared to moderately undernourished ewes (CS ≥ 3).

    Conclusions:

    • Severe undernutrition in ovariectomized ewes leads to a significant reduction in LH release.
    • Nutritional status critically influences the hypothalamic-pituitary-gonadal axis function.
    • Body condition score serves as a reliable indicator of the impact of undernutrition on LH secretion in ewes.