Study type: Medical/biological study (experimental study)

Development of preincubated chicken eggs following exposure to 50 Hz electromagnetic fields with 1.33-7.32 mT flux densities. med./bio.

Published in: Indian J Exp Biol 2004; 42 (9): 858-865

Aim of study (acc. to author)

To study the effects of extremely low frequency electromagnetic fields on 307 healthy, freshly fertilized white leghorn chicken eggs (55-65 g).

Endpoint

Exposure

Exposure Parameters
Exposure 1: 50 Hz
Exposure duration: continuous for 24 h
  • magnetic flux density: 7.32 mT maximum (6.90 mT, 6.65 mT, 5.86 mT, 5.52 mT, 5.32 mT, 4.39 mT, 4.14 mT, 3.39 mT, 2.93 mT, 2.76 mT, 2.66 mT, 1.46 mT, 1.38 mT and 1.33 mT)
  • magnetic flux density: 7.32 mT maximum (6.90 mT, 6.65 mT, 5.86 mT, 5.52 mT, 5.32 mT, 4.39 mT, 4.14 mT, 3.39 mT, 2.93 mT, 2.76 mT, 2.66 mT, 1.46 mT, 1.38 mT and 1.33 mT)

Exposure 1

Main characteristics
Frequency 50 Hz
Type
Waveform
  • unspecified
Exposure duration continuous for 24 h
Exposure setup
Exposure source
  • cylindrical coil 42 cm long, 9.6 cm inside and 11.5 cm outside diameter, respectively
Chamber The coil was placed in an east west direction, inside the incubator.
Setup In each experiment, 5 eggs were placed inside the coil with their long axis parallel to the embryo`s long axis and perpendicular to the egg`s long axis. Sham exposure group was placed inside the coil but in the absense of MF. Control group was placed outside the coil.
Parameters
Measurand Value Type Method Mass Remarks
magnetic flux density 7.32 mT maximum calculated - 6.90 mT, 6.65 mT, 5.86 mT, 5.52 mT, 5.32 mT, 4.39 mT, 4.14 mT, 3.39 mT, 2.93 mT, 2.76 mT, 2.66 mT, 1.46 mT, 1.38 mT and 1.33 mT
magnetic flux density 7.32 mT maximum calculated - 6.90 mT, 6.65 mT, 5.86 mT, 5.52 mT, 5.32 mT, 4.39 mT, 4.14 mT, 3.39 mT, 2.93 mT, 2.76 mT, 2.66 mT, 1.46 mT, 1.38 mT and 1.33 mT

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

After exposure at 4.19, 5.32, 5.86, and 6.65 mT magnetic flux densities there was a significant difference in the percentage of abnormal embryos comparing with control embryos. Skeletal investigation showed some embryos with extra ribs, defects in ribs and vertebrae and abnormal beaks.
There were no significant differences in egg weight, after 9 days of incubation, between control, sham-exposed and exposed groups. There were no effects on crown-rump length and beak-occipital length. There was a significant decrease in embryo weight after 4.39 and 5.52 mT exposure, comparing with control and sham-exposed embryos.

Study character:

Study funded by

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