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Related Experiment Videos

The ovariectomized sheep as a model for human bone loss.

B I Newton1, R C Cooper, J A Gilbert

  • 1Department of Agricultural and Biological Engineering, University of Mississippi Medical Center, 2500 North State Street, Jackson, Mississippi 39216-4505, USA.

Journal of Comparative Pathology
|April 1, 2004
PubMed
Summary

Ovariectomized sheep exhibit reduced bone volume and thickness, mirroring osteoporosis changes. This study validates the ovariectomized sheep as a model for estrogen deficiency-related bone loss in humans.

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Area of Science:

  • Veterinary Medicine
  • Orthopedics
  • Endocrinology

Background:

  • Osteoporosis is a significant health concern, particularly in postmenopausal women.
  • Estrogen deficiency is a primary driver of bone loss and architectural changes.

Purpose of the Study:

  • To evaluate the effects of ovariectomy on ovine iliac bone trabeculae.
  • To establish a suitable animal model for studying human osteoporosis.

Main Methods:

  • Seven ovariectomized (OVX) and five control Dorset ewes were studied for one year.
  • Iliac crest bone samples were analyzed at baseline and after 12 months.
  • Serum and urinary markers of bone metabolism (17beta-oestradiol, osteocalcin, deoxypyridinium) were monitored.

Main Results:

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  • OVX sheep showed significant reductions in trabecular bone volume and thickness (P<0.05).
  • Trabecular separation increased significantly in OVX sheep (P<0.05).
  • Estrogen levels decreased, while bone turnover markers (osteocalcin, deoxypyridinium) increased in OVX sheep.

Conclusions:

  • Ovariectomy in sheep leads to detrimental changes in trabecular bone architecture.
  • The OVX sheep model effectively replicates bone changes seen in estrogen deficiency.
  • This model is valuable for developing strategies to combat osteoporosis, especially in early menopause.