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Asian Journal of Animal and Veterinary Advances

Year: 2012 | Volume: 7 | Issue: 8 | Page No.: 733-738
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Authors

Alireza Lotfi

Mohammad Narimani-Rad

Keywords

Research Article

Effect of Exposure to Extremely Low Frequency Electromagnetic Fields (50 Hz, 0.5 mT) During Incubation on Hatchability, T3 and T4 Levels in Newly-hatched Chicks

Alireza Lotfi and Mohammad Narimani-Rad
The aim of present study was to determine the effect of intermitted exposure to Extremely Low Frequency (ELF) and Electromagnetic Fields (EMF) during different periods of incubation on embryonic mortality, total hatchability and thyroid hormones level in hatched chicks. Experimental groups were classified as group 1 (control), with normal incubation process and without any exposing to EMF; group 2 included eggs exposed to ELF-EMF, 2 h daily for 0-7 day of incubation; group 3 included eggs exposed for 2 h daily from day-8 to -14 of incubation; group 4; included eggs exposed from day-15 to -21 of incubation and group 5 included eggs exposed from day-1 to -21 of incubation (whole incubation period). Incubation condition with exception to EMF exposing was similar for all groups. After observations for hatching characterizes, the blood samples were collected. The samples were centrifuged and serum was obtained for determination of the T3 and T4 level. Exposure to EMFs didn’t have similar effect on hatchability; the groups 2 and 3 that exposed for a stage had significant lower hatchability in comparison with group 1 (control) and group 5. Group 3 had highest mid-embryonic mortality rate. The late-embryonic mortality was high in control group. The group 5 had highest early-embryonic mortality rate. There is not any significant difference for T3 concentrations between groups. Level of T4 is significantly increased for groups 2 and 3, when it compared with control groups (p<0.05). It was concluded that intermitted exposure to ELF- EMF during 2nd or 3rd week of embryonic life can cause considerable mortality rate and hatchability decreases. Although exposure to EMF entire incubation period or at first week couldn’t has significant effect on hatchability. Exposing to ELF-EMF during 1-14 d of incubation caused T4 level increases, whereas T3 level was not affected by EMF.
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