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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.
|ばく露時間||continuous for 16 h/day for up to 2 estrous cycles|
|Additional information||vertical electric field horizontal magnetic field|
|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.