Blood melatonin and prolactin concentrations in dairy cows exposed to 60 Hz electric and magnetic fields during 8 h photoperiods

Bioelectromagnetics
Maria RodriguezE Block

Abstract

Two experiments were conducted to test the hypothesis that electric and magnetic field (EMF) exposure may result in endocrine responses similar to those observed in animals exposed to long days. In the first experiment, 16 lactating, pregnant Holstein cows were assigned to two replicates according to a crossover design with treatment switchback. All animals were confined to wooden metabolic cages and maintained under short day photoperiods (8 h light/16 h dark). Treated animals were exposed to a vertical electric field of 10 kV/m and a horizontal magnetic field of 30 microT (EMF) for 16 h/day for 4 weeks. In a second, similar experiment, 16 nonlactating, nonpregnant Holstein cows subjected to short days were exposed to EMF, using a similar protocol, for periods corresponding to the duration of one estrous cycle. In the first experiment, circulating MLT concentrations during the light period showed a small numerical decrease during EMF exposure (P < .05). Least-square means for the 8 h light period were 9.9 versus 12.4 pg/ml, SE = 1.3. Melatonin concentrations during the dark period were not affected by the treatment. A similar trend was observed in the second experiment, where MLT concentrations during the light period tended t...Continue Reading

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Citations

Mar 19, 2015·Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere·D Haser, M Fürll
Apr 19, 2005·Birth Defects Research. Part B, Developmental and Reproductive Toxicology·Yijun ShiTao Song
May 12, 2007·Bioelectromagnetics·J F BurchardH G Monardes
May 9, 2012·Clinical and Experimental Reproductive Medicine·Myung Chan Gye, Chan Jin Park
May 26, 2006·Bioelectromagnetics·Javier F BurchardMaria Rodriguez
May 26, 2018·Proceedings. Biological Sciences·Jukka JuutilainenP J Hore

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