Some data on establishing a specific-pathogen-free guinea pig colony.

Area of Science:

• Comparative Medicine
• Laboratory Animal Science
• Microbiology

Background:

• Germfree animals are crucial models for studying host-microbe interactions and immune system development.
• Establishing and maintaining germfree animal colonies presents significant technical challenges.
• Guinea pigs are valuable models, but germfree delivery and maintenance protocols require refinement.

Purpose of the Study:

• To detail the procedures for germfree guinea pig delivery using a dry hysterectomy technique.
• To describe methods for the specific-pathogen-free maintenance and feeding of these animals.
• To evaluate the impact of feeding frequency on early mortality.

Main Methods:

• Germfree delivery of guinea pigs was performed using a "dry hysterectomy" technique.
• Post-operative care involved specific-pathogen-free maintenance and association with anaerobic flora.
• Feeding regimens were compared: three times daily versus twice daily.

Main Results:

• Out of 320 animals delivered alive, a 37% mortality rate was observed, primarily in the first two weeks.
• Animals fed three times a day exhibited a significantly lower mortality rate (20%) compared to those fed twice a day (48%).

Conclusions:

• The dry hysterectomy technique is a viable method for germfree guinea pig delivery.
• Careful post-operative maintenance, including appropriate feeding strategies, is critical for reducing mortality.
• Increased feeding frequency is a key factor in improving survival rates of germfree guinea pigs.