Effect of 10 kV, 30 μT, 60 Hz electric and magnetic fields on milk production and feed intake in nonpregnant dairy cattle

Burchard, J.F.; Monardes, H.G.; Nguyen, Duc Hai

doi:10.1002/bem.10132

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…The results obtained for dry matter intake (DMI), protein and energy intake, are in agreement with the expected intake according to the nutritional requirements for dairy cattle of the National Research Council [NRC, 1989]. The variations in DMI, P4, MLT, PRL, and IGF-1 associated with EMF exposure observed in previous experiments [Burchard et al, 1996[Burchard et al, , 1998a[Burchard et al, ,b, 1999[Burchard et al, , 2003Rodriguez et al, 1998], were not detected in this experiment.…”

Section: Resultssupporting

confidence: 89%

Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones

Burchard

Nguyen

Monardes

et al. 2004

Bioelectromagnetics

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Sixteen pregnant Holstein heifers weighing 521 +/- 46 kg, at 3.3 +/- 0.7 months of gestation and 2.2 +/- 2.0 months of age were confined to wooden metabolism cages and were exposed to a vertical electric field (EF) of 10.0 +/- 0.4 kV/m and an artificial light cycle of 12 h light-12 h dark. The heifers were divided into two replicates of eight each. Each replicate was divided into two groups of four animals each, one group becoming the non-exposed and the second, the EF exposed group. The exposed group were housed in metabolism cages in an area where EF were generated, and the non-exposed group, in metabolism cages located in the adjacent area where the EF was less than 2% of that present in the exposed area. The test animals were subject to the different treatments for 4 weeks continuously. After 4 weeks, the animals switched treatment, the exposed group becoming the non-exposed group and vice-versa. Then the treatment continued for 4 more weeks. Catheters were inserted into the jugular vein of the animals, and blood samples were collected on twice a week to estimate the serum concentration of progesterone (P4), melatonin (MLT), prolactin (PRL), and insulin-like growth factor-1 (IGF-1). Feed consumption was measured daily and feed samples were collected twice a week. The results indicated that exposure of dairy cattle to EF similar to those encountered directly underneath a 735 kV high tension electrical power line carrying a maximum load of current, cannot be associated with any variation in the experimental variables mentioned above. An exception to this, is the variation in MLT, which was associated with the EF exposure. Due to the inconsistency of the MLT response in the different replicates, caution should be exercised in the interpretation of this phenomenon.

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Section: Resultssupporting

confidence: 89%

Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones

Burchard

Nguyen

Monardes

et al. 2004

Bioelectromagnetics

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“…After installing the shielded neutral isolation transformer, cows stopped dancing and milk production gradually recovered to its highest previous level after about 18 months [ 59 ]. Similar studies have confirmed that exposure (10 kV m −1 , 30 μT, 60 Hz) resulted in moderate (5%) decreases in both milk yield and milk fat percentage as well as an increase in dry matter intake in non-lactating non-pregnant dairy cows [ 60 ].…”

Section: Resultssupporting

confidence: 54%

Biological Anomalies around the 2009 L’Aquila Earthquake

Fidani¹

2013

Animals

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Simple SummaryEarthquakes have been seldom associated with reported non-seismic phenomena observed weeks before and after shocks. Non-seismic phenomena are characterized by radio disturbances and light emissions as well as degassing of vast areas near the epicenter with chemical alterations of shallow geospheres (aquifers, soils) and the troposphere. Many animals are sensitive to even the weakest changes in the environment, typically responding with behavioral and physiological changes. A specific questionnaire was developed to collect data on these changes around the time of the 2009 L’Aquila earthquake.AbstractThe April 6, 2009 L’Aquila earthquake was the strongest seismic event to occur in Italy over the last thirty years with a magnitude of M = 6.3. Around the time of the seismic swarm many instruments were operating in Central Italy, even if not dedicated to biological effects associated with the stress field variations, including seismicity. Testimonies were collected using a specific questionnaire immediately after the main shock, including data on earthquake lights, gas leaks, human diseases, and irregular animal behavior. The questionnaire was made up of a sequence of arguments, based upon past historical earthquake observations and compiled over seven months after the main shock. Data on animal behavior, before, during and after the main shocks, were analyzed in space/time distributions with respect to the epicenter area, evidencing the specific responses of different animals. Several instances of strange animal behavior were observed which could causally support the hypotheses that they were induced by the physical presence of gas, electric charges and electromagnetic waves in atmosphere. The aim of this study was to order the biological observations and thereby allow future work to determine whether these observations were influenced by geophysical parameters.

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“…The fact that the effect of MF was not uniform during different weeks, evidenced by the treatment by week interaction, might contribute to explain this MF effect on body weight and weekly body weight gain. Simultaneous application of EF and MF increased DMI [Burchard et al, 1996;Rodriguez et al, 2002;Burchard et al, 2003] and weight gain [Rodriguez et al, 2002] in dairy cattle. Conversely, exposure to 10 kV/m EFs does not affect DMI in dairy heifers .…”

Section: Discussionmentioning

confidence: 99%

Exposure of pregnant dairy heifer to magnetic fields at 60 Hz and 30 µT

Burchard

Nguyen

Monardes

2007

Bioelectromagnetics

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Thirty-two pregnant Holstein heifers weighing 499 +/- 45 kg, at 3.1 +/- .7 months of gestation and 21 +/- 2.0 months of age were confined and exposed to 30 microT magnetic fields (MFs) and a 12 h light/12 h dark light cycle. The heifers were divided into two replicates of 16 animals. Each replicate was divided into two groups of eight animals each, one group the non-exposed and the second, the exposed group. The animals were subjected to the different treatments for 4 weeks. After 4 weeks, the animals switched treatment, the exposed group becoming the non-exposed group and vice versa. Then the treatment continued for 4 more weeks. Catheters were inserted into the jugular vein, and blood samples were collected twice a week to estimate the concentration of progesterone (P4), melatonin (MLT), prolactin (PRL), and insulin-like growth factor 1 (IGF-1). Feed consumption was measured daily. The results indicated that exposure of pregnant heifers to MF similar to those encountered underneath a 735 kV high tension electrical power line for 20 h/day during a period of 4 weeks produces slight effects. This is evidenced by statistically significant higher body weight (1.2%), higher weekly body weight gain (30%), and decreases in the concentration of PRL (15%) and IGF-1 (4%) in blood serum. The absence of abnormal clinical signs and the absolute magnitude of the significant changes detected during MF exposure, make it plausible to preclude any major animal health hazard.

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Effect of 10 kV, 30 μT, 60 Hz electric and magnetic fields on milk production and feed intake in nonpregnant dairy cattle

Cited by 12 publications

References 34 publications

Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones

Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones

Biological Anomalies around the 2009 L’Aquila Earthquake

Exposure of pregnant dairy heifer to magnetic fields at 60 Hz and 30 µT

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