Lunar Cycle Influences Spontaneous Delivery in Cows

Area of Science:

• Veterinary Science
• Animal Reproduction
• Chronobiology

Background:

• A common belief suggests lunar cycles affect spontaneous deliveries in humans and cattle.
• Understanding environmental influences on parturition is crucial for animal management.

Purpose of the Study:

• To investigate the relationship between lunar phases and spontaneous deliveries in domestic Holstein cows.
• To determine if dairy cows can serve as models for bio-meteorological studies on parturition.

Main Methods:

• Retrospective analysis of 428 spontaneous, full-term Holstein cow deliveries over three years.
• Data collected from calving records on a private farm in Hokkaido, Japan.
• Statistical comparison of birth frequencies across different lunar phases (synodic distribution).

Main Results:

• Spontaneous birth frequency showed a uniform increase from new moon to full moon, then decreased towards the waning crescent.
• A statistically significant peak in deliveries occurred between the waxing gibbous and full moon phases.
• This lunar influence was evident in multiparous cows but not in nulliparous cows.

Conclusions:

• Dairy cows exhibit a discernible pattern of spontaneous deliveries correlating with lunar phases.
• Multiparous cows are more sensitive to lunar cycle influences on parturition than nulliparous cows.
• Monitoring lunar phases may enhance the understanding of parturition in cattle and support bio-meteorological research.