Absorption and elimination kinetics of 32P malathion in the hen

Area of Science:

• Agricultural Science
• Environmental Science
• Toxicology

Background:

• Understanding pesticide metabolism in poultry is crucial for food safety and environmental impact assessment.
• Malathion is a widely used organophosphate insecticide.
• Limited data exists on the specific absorption, distribution, metabolism, and excretion (ADME) of malathion in avian species.

Purpose of the Study:

• To develop a method for separating hen urine and feces.
• To investigate the biological fate of 32P malathion after oral administration in hens.
• To determine the absorption rate, excretion pathways, and potential for accumulation of malathion in poultry.

Main Methods:

• A novel method was employed to effectively separate urine and feces in hens.
• A single oral dose of 32P-labeled malathion (262.40 mg/kg body weight) was administered to hens.
• Radioactivity (32P) was quantified in plasma, whole blood, urine, and feces over a 48-hour period.

Main Results:

• 32P malathion was rapidly absorbed from the gastrointestinal tract, with significant levels detected in plasma and blood within 30 minutes.
• Total 32P elimination followed first-order kinetics in urine, with a mean half-life of 5.7 hours.
• Approximately 93% of the administered 32P was excreted via urine within 48 hours, indicating near-complete absorption.

Conclusions:

• Malathion is efficiently absorbed and rapidly excreted by hens, primarily through urine.
• The rapid excretion and high urinary recovery suggest a low potential for malathion accumulation in the avian system.
• The developed separation method facilitates accurate ADME studies in poultry.