The Dutch-Belted rabbit: an alternative breed for developmental toxicity testing.

Area of Science:

• Comparative toxicology
• Preclinical research
• Animal models in drug development

Background:

• Historical control data are essential for interpreting toxicity study findings.
• Establishing reliable control data is critical for regulatory submissions.
• Variability in control data can impact study outcomes.

Purpose of the Study:

• To evaluate the Dutch-Belted rabbit as an alternative animal model for developmental and reproductive toxicity testing.
• To compare physiological and morphological data of Dutch-Belted rabbits with New Zealand White rabbits.
• To assess the suitability of Dutch-Belted rabbits for pharmaceutical safety assessments.

Main Methods:

• Collected and analyzed data from 236 untreated pregnant Dutch-Belted rabbits.
• Compared data with historical control data from 350 untreated pregnant New Zealand White Rabbits.
• Evaluated maternal body weight, food consumption, hematology, serum biochemistry, reproductive parameters, and fetal morphology.

Main Results:

• Dutch-Belted rabbits require approximately 40% less drug due to their smaller size.
• Pigmentation of Dutch-Belted rabbits allows for xenobiotic effects on melanocytes and melanin-binding drug evaluation.
• No significant differences were noted in spontaneous fetal morphological alterations compared to historical controls.

Conclusions:

• The Dutch-Belted rabbit is a practical and suitable alternative to the New Zealand White rabbit for toxicity studies.
• This breed offers potential cost savings and expanded research applications in drug development.
• The data support the use of Dutch-Belted rabbits in regulatory toxicity testing.