Spermatogenesis is modified by food intake in mice

Area of Science:

• Reproductive Biology
• Comparative Physiology
• Mammalian Reproduction

Background:

• Spermatogenesis is often considered resistant to reduced food intake in mammals.
• Previous studies have not fully contextualized testicular responses within species-specific reproductive traits.

Purpose of the Study:

• To investigate the species-specific effects of mild, sustained food restriction on spermatogenesis in wild rodents.
• To explore intraspecific variation in testicular responses to dietary changes.

Main Methods:

• Exposed house mice and deer mice to a 30% reduction in food intake for 5 weeks.
• Assessed testicular function and spermatogenesis in both species under controlled conditions.

Main Results:

• House mice exhibited unchanged spermatogenesis despite food restriction.
• Deer mice displayed a range of testicular responses, from normal spermatogenesis to azoospermia, indicating significant intraspecific variation.
• Food restriction evoked species-specific adjustments in testicular function.

Conclusions:

• Modest food restriction induces species-specific adaptations in male reproductive function.
• Intraspecific variation in spermatogenesis suggests individual differences in sensitivity to nutritional changes.
• Male reproductive health must be understood within the evolutionary and physiological context of a species.