Hypoaldosteronism in piglets induced by carbadox.

Area of Science:

• Veterinary Pharmacology
• Animal Toxicology
• Endocrinology

Background:

• Carbadox is an additive used in animal feed.
• Previous studies have not fully elucidated the toxic mechanisms of carbadox.
• Observed toxic effects include dehydration, appetite loss, and adrenal cortex alterations.

Purpose of the Study:

• To investigate the toxic mechanisms of carbadox in young pigs.
• To identify specific structural and functional changes induced by carbadox exposure.
• To understand the impact of carbadox on the adrenal gland, particularly the zona glomerulosa.

Main Methods:

• Young pigs were administered carbadox in feed at 150 ppm.
• Plasma aldosterone levels were measured.
• Blood levels of sodium and potassium were analyzed.
• Autopsy included examination of the adrenal cortex structure.

Main Results:

• Carbadox administration led to a rapid decline in plasma aldosterone levels (to 10% of control).
• Significant alterations in blood sodium and potassium levels were observed.
• Specific and selective structural changes were noted in the zona glomerulosa of the adrenal cortex.
• These changes suggest a functional extirpation of the adrenal zona glomerulosa.

Conclusions:

• Carbadox induces toxic effects in pigs, including dehydration and appetite loss.
• The drug selectively targets the aldosterone-producing zona glomerulosa of the adrenal cortex.
• Carbadox causes a functional, potentially reversible, extirpation of the adrenal zona glomerulosa in pigs.
• These findings highlight the endocrine-disrupting potential of carbadox.