Retention data for antibiotics commonly used for bovine infections

Area of Science:

• Veterinary Pharmacology
• Food Safety
• Animal Health

Background:

• Antibiotic use in cattle is crucial for treating infections like mastitis.
• Ensuring milk safety requires understanding antibiotic persistence post-treatment.
• Intrauterine antibiotic treatments present unique residue concerns.

Purpose of the Study:

• To determine the milk residue persistence of various antibiotics used in bovine treatment.
• To evaluate adherence to label-specified withdrawal times.
• To assess the need for revised guidelines for intrauterine antibiotic treatments.

Main Methods:

• Utilized Delvotest-P and Bacillus stearothermophilus disc assay for antibiotic detection.
• Monitored milk samples following different antibiotic administration routes.
• Compared detected residue levels against manufacturer-provided withholding times.

Main Results:

• No tested antibiotics persisted in milk beyond their labeled withdrawal periods.
• Antibiotic residues were detected in milk following intrauterine infection treatments.
• Current label guidelines may not adequately address intrauterine treatment residue risks.

Conclusions:

• Standard antibiotic treatments for bovine mastitis generally comply with withdrawal times.
• Intrauterine antibiotic administration necessitates specific residue monitoring and guideline development.
• Establishing clear withholding times for intrauterine treatments is essential for milk safety.