短日光下で牛の発情周期に対するELF MFばく露の影響を調べために、非妊娠牛を垂直電界10kV/m、水平電界30μTを二つのシーケンスで一日に16時間ばく露させた。各シーケンスに3つの期間を設け、各期間は1発情周期に相当している。試験の間、動物は短日光下(8時間明/16時間暗)で管理された。EMFばく露は完全な発情周期(P<0.01)の期間と黄体フェーズ期間(P<0.01)に対して影響があった。対照群の1周期の平均は19.5±0.4日で、ばく露群は15.4±0.4日であった。プロゲストロン(P4)カーブの全領域、カーブの振幅、黄体フェーズの立上がり時のP4の勾配などにはEMFばく露の影響はなかった。結果として、EMFばく露は発情周期を増やす可能性を示した。
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The effects of exposure of dairy cows to an extremely low frequency electric and magnetic field on the estrous cycle should be investigated.
16 cows, which were synchronized in the starting points of their estrous cycle, were divided into two groups (only 13 cows analyzed; group 1: n=6 and group 2: n=7), each being assigned to a different exposure sequence. Each sequence consisted of three periods and each period corresponded to one estrous cycle. Group 1: sham exposure - exposure - exposure, and group 2: exposure - sham exposure - sham exposure.
周波数 | 60 Hz |
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タイプ |
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ばく露時間 | continuous for 16 h/day for up to 2 estrous cycles |
Additional information | vertical electric field horizontal magnetic field |
ばく露の発生源/構造 |
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チャンバの詳細 | chamber (15 m long, 10 m wide and 3 m high) containing eight wooden box stalls, each holding one cow |
ばく露装置の詳細 | the magnetic field was generated by 14 rectangular coils, 10 m long and 4 m high; the electric field was generated by two plates, 9 m long and 6.5 m wide, that were suspended 0.4 m from the ceiling by synthetic isolators; a short photoperiod (8 h light/16 h dark) was provided during all exposure periods |
Sham exposure | A sham exposure was conducted. |
The durations of the estrous cycle and luteal phase were found to be slightly but significantly longer under exposure conditions compared to sham exposure conditions.
The authors conclude that exposure of dairy cows to an extremely low frequency electric and magnetic field could increase the duration of the estrous cycle.
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