J.F. Burchard

TL;DR: Concentrations of Ca, Mg, Cu, Zn, Fe, Mn, Na, P, and K in blood plasma and cerebrospinal fluid were determined and exposure to electric and magnetic fields resulted in decreased concentrations of Mg inBlood plasma and in increased concentrations of Ca and P and decreases concentrations of Fe and Mn in cerebro Spinal fluid.

TL;DR: Evidence is provided that EMF exposure may modify the response of dairy cows to photoperiod and plasma prolactin concentrations found were lower, and the mean plasma PRL concentration was not affected by treatment.

TL;DR: Estrous cycle length, determined by the presence of a functional corpus luteum detected by concentrations of progesterone equal to or more than 1 ng/ml plasma, was shorter in nonexposed cows than when they were exposed to EMF.

TL;DR: Results indicate that exposure to EMF may increase the duration of the estrous cycle and the total area under the progesterone (P(4)) curve, the amplitude of the curve or the slope of the P(4) rise at the onset of the luteal phase were not affected by EMF exposure.

TL;DR: The hypothesis that EMF act by modifying the response to photoperiod was tested by subjecting dairy cows to controlled EMF exposure while keeping them under short-day conditions, and milk yield was significantly higher for the exposed animals during wk 4 of treatment.