To contribute data on the possible action exerted by magnetic fields on embryonic development by studying their effects on the body weight and cranial/cephalic development of the chick embryo.
Fertilized eggs were incubated and the parameters were studied at 15 and 21 days of incubation.
| Exposure | Parameters |
|---|---|
|
Exposure 1:
50 Hz
Exposure duration:
continuous for 15 or 21 days
|
|
|
Exposure 2:
50 Hz
Exposure duration:
continuous for 15 or 21 days
|
|
|
Exposure 3:
50 Hz
Exposure duration:
continuous for 15 or 21 days
|
|
Fertilized eggs were divided into 3 groups exposure groups and 1 control group of 80 eggs each.
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform |
|
| Exposure duration | continuous for 15 or 21 days |
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 1 µT | unspecified | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform |
|
| Exposure duration | continuous for 15 or 21 days |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 500 µT | unspecified | measured | - | - |
| Frequency | 50 Hz |
|---|---|
| Type | |
| Waveform |
|
| Exposure duration | continuous for 15 or 21 days |
| Exposure source |
|
|---|
| Measurand | Value | Type | Method | Mass | Remarks |
|---|---|---|---|---|---|
| magnetic flux density | 1 mT | unspecified | measured | - | - |
At 15 days of incubation: body weight was significantly lower versus controls in all exposed embryos; the transverse cranial diameter was increased versus controls at all intensities used except for 1 mT; the vertical diameter was greater versus controls in all embryos exposed to 1 mT, whereas it was smaller in those exposed to 1 µT or 0.5 mT.
At 21 days of incubation: the body weight and cranial diameters of exposed embryos were all smaller versus controls, with a significance that depended on the intensity of the magnetic field. There were no differences in brain weight between exposed and control embryos, either at 15 or 21 days of incubation.
These results support the hypothesis that magnetic fields may affect embryonic development.
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