In vitro capacitation of ejaculated rabbit spermatozoa

Area of Science:

• Reproductive Biology
• Sperm Physiology
• Mammalian Fertilization

Background:

• Spermatozoa require physiological changes, termed capacitation, in the female reproductive tract before fertilization.
• In vitro capacitation is well-established in rodents but remains challenging and inconsistent in rabbits.

Purpose of the Study:

• To establish reliable in vitro capacitation conditions for ejaculated rabbit sperm.
• To assess the fertilizing capacity of in vitro capacitated rabbit sperm.

Main Methods:

• Pooled ejaculates from fertile bucks were used to ensure consistent results.
• Optimized incubation conditions included extended time (12 h), heated rabbit serum (20%), and a specific gas atmosphere (5% CO2, 8% O2, 87% N2).
• Fertilization was assessed through both in vitro and in vivo assays.

Main Results:

• Successful in vitro capacitation of rabbit sperm was achieved under the defined conditions.
• In vitro capacitation resulted in a 67% fertilization rate.
• This rate was comparable to in vivo capacitation (89% fertilization after 13 h in the uterus).

Conclusions:

• The study successfully established a reproducible method for in vitro capacitation of rabbit sperm.
• These findings provide a valuable tool for reproductive research in rabbits.
• The optimized conditions offer a potential alternative to in vivo capacitation for assisted reproductive technologies.