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Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants

Bioeffects Seen

Authors not listed · 2009

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Power line electromagnetic fields disrupt magnetic navigation in cattle and deer, proving biological effects from everyday EMF sources.

Plain English Summary

Summary written for general audiences

Researchers found that cattle and deer naturally align their bodies north-south with Earth's magnetic field, but this behavior becomes random near high-voltage power lines. The extremely low-frequency electromagnetic fields from power lines disrupt the animals' magnetic sensing ability, with effects diminishing as distance from the lines increases.

Why This Matters

This study provides compelling evidence that large mammals possess magnetic sensing capabilities that can be disrupted by man-made electromagnetic fields. What makes this research particularly significant is that it demonstrates measurable biological effects from the same extremely low-frequency fields generated by power lines that millions of people live near every day. The fact that these relatively weak fields can override millions of years of evolutionary magnetic navigation suggests our own biology may be more vulnerable to EMF disruption than previously understood. While we can't simply extrapolate from cattle behavior to human health effects, this research adds to the growing body of evidence that EMF exposure has real biological consequences at the cellular and molecular levels.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2009). Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants.
Show BibTeX
@article{extremely_low_frequency_electromagnetic_fields_disrupt_magnetic_alignment_of_ruminants_ce1399,
  author = {Unknown},
  title = {Extremely low-frequency electromagnetic fields disrupt magnetic alignment of ruminants},
  year = {2009},
  doi = {10.1073/pnas.0811194106},
  
}
DOI: 10.1073/pnas.0811194106PubMed: 19299504

Quick Questions About This Study

Yes, when grazing or resting, cattle and deer consistently orient their bodies in a north-south direction, following Earth's natural magnetic field lines. This behavior appears to be an innate biological response to geomagnetic cues.
Research shows that extremely low-frequency electromagnetic fields from high-voltage power lines completely disrupt the natural north-south alignment behavior in cattle and deer, causing random body orientation instead of magnetic alignment.
The study found that the disrupting effects of power line electromagnetic fields on animal magnetic alignment diminish with distance from the conductors, though specific distances weren't provided in the research.
The researchers note that observable behavioral changes in large mammals indicate effects are occurring at cellular and molecular levels, suggesting similar EMF sources could potentially affect human biology in ways we don't yet fully understand.
This study provides some of the strongest evidence for magnetic sensation capabilities in large mammals, demonstrating both the natural behavior and its disruption by artificial electromagnetic fields in a controlled research setting.