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Related Experiment Videos

"Aging bull'

G W Geelhoed1

  • 1George Washington University Medical Center, Washington, DC, USA.

Medical Hypotheses
|December 1, 1996
PubMed
Summary
This summary is machine-generated.

Aging bulls develop endocrine tumors, particularly in ultimobranchial bodies, unlike cows. This study explores these tumors as a potential model for human endocrine abnormalities.

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Area of Science:

  • Veterinary Pathology
  • Endocrinology
  • Comparative Oncology

Background:

  • Aging bulls exhibit vertebral osteosclerosis and ankylosing spondylosis, limiting reproductive potential.
  • These bulls also show a high incidence of endocrine neoplasms, specifically in ultimobranchial bodies, not observed in cows.
  • These findings suggest a potential model for human hereditary endocrine abnormalities.

Purpose of the Study:

  • To investigate the prevalence and characteristics of endocrine neoplasms in aging bulls.
  • To explore the relationship between diet, calcium metabolism, and tumor development in bulls.
  • To assess the potential of these bovine tumors as a model for human endocrine diseases.

Main Methods:

  • Histopathological examination of ultimobranchial bodies and parathyroid glands in aging bulls.

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  • Measurement of calcitonin levels and calcium infusion tests.
  • Comparative analysis between affected bulls and age-matched cows.

    • Main Results:

    • Nearly half of aging bulls (>6.5 years) exhibit ultimobranchial body abnormalities (20% hyperplasia, 30% neoplasia).
    • Ultimobranchial tumors, ranging from hyperplasia to carcinoma, secrete calcitonin, stimulated by calcium but without altering serum calcium.
    • Affected bulls show parathyroid gland atrophy followed by hyperplasia and autonomy; some also develop pheochromocytomas and pituitary adenomas.

    Conclusions:

    • Chronic calcium stimulation in bulls, coupled with a positive calcium balance, may drive ultimobranchial neoplasia.
    • These bovine endocrine tumors, especially those involving ultimobranchial bodies, offer a valuable model for studying human hereditary endocrine disorders.
    • The findings highlight the distinct endocrine and metabolic differences between aging bulls and cows.