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Lunar and climatic effects on boar ejaculate traits.

Josué Chinchilla-Vargas1, Karl Kerns2, Max F Rothschild1

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Moon phase and season significantly impact boar ejaculate volume, sperm concentration, and AI doses. Optimizing swine production may involve scheduling semen collection based on lunar cycles and seasons.

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Area of Science:

  • Animal Science
  • Reproductive Biology
  • Environmental Influences on Livestock

Background:

  • While moon phases are known to influence wild animal reproduction, their effect on domestic livestock is less understood.
  • Boar reproductive efficiency is crucial for swine production, but environmental factors influencing semen quality require further investigation.

Purpose of the Study:

  • To investigate the effects of moon phase and climatic variables on boar ejaculate traits.
  • To determine if moon phase and season interact to influence semen quality in boars.

Main Methods:

  • Analysis of 4149 semen collections from nine boar breeds.
  • Evaluation of moon phase, temperature, humidity, and season as potential influencing factors.
  • Assessment of semen traits including ejaculate volume, sperm concentration, and AI doses per ejaculate.

Main Results:

  • Season and moon phase significantly interacted to affect ejaculate volume, sperm concentration, and AI doses.
  • Moon phase directly influenced ejaculate volume on the day of collection.
  • Sperm concentration was affected by the interaction of moon phase with season, temperature, humidity, and breed.

Conclusions:

  • The interaction between season and moon phase significantly impacts key boar semen traits.
  • Strategic scheduling of semen collection, considering both season and moon phase, may enhance boar productivity in swine operations.