Response of dairy cattle to transient voltages and magnetic fields
- Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Nebraska, Lincoln, NE (United States)
Stray voltages in dairy facilities have been studied since the 1970`s. Previous research using steady-state ac and dc voltages has defined cow-contact voltage levels which may cause behavior and associated production problems. This research was designed to address concerns over possible effects of transient voltages and magnetic fields on dairy cows. Dairy cows response to transient voltages and magnetic fields was measured. The waveforms of the transient voltages applied were: 5 cycles of 60-Hz ac with a total pulse time of 83 ms, 1 cycle of 60-Hz ac with a total pulse time of 16 ms, and 1 cycle of an ac square wave (spiking positive and negative) of 2-ms duration. Alternating magnetic fields were produced by passing 60-Hz ac fundamental frequency with 2nd and 3rd harmonic and random noise components in metal structures around the cows. The maximum magnetic field associated with this current flow was in excess of 4 G. A wide range of sensitivity to transient voltages was observed among cows. Response levels from 24 cows to each transient exposure were normally distributed. No responses to magnetic fields were observed.
- OSTI ID:
- 131558
- Journal Information:
- IEEE Transactions on Industry Applications, Vol. 31, Issue 4; Other Information: DN: Paper presented at the 1994 IEEE Rural Electric Power Conference, Colorado Springs, CO (US), April 24--26, 1994; PBD: Jul-Aug 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
I$sup 131$ IN MILK AND THYROID OF DAIRY CATTLE FOLLOWING A SINGLE CONTAMINATION EVENT AND PROLONGED DAILY ADMINISTRATION
Source of stray voltage and effect on cow health and performance