Epidemiologic study of Holstein dairy cow performance and reproduction near a high‐voltage direct‐current powerline
作者:
FrankB. Martin,
Alan Bender,
Gerald Steuernagel,
R. Ashley Robinson,
Rodney Revsbech,
DaleK. Sorensen,
Norman Williamson,
Allan Williams,
期刊:
Journal of Toxicology and Environmental Health
(Taylor Available online 1986)
卷期:
Volume 19,
issue 3
页码: 303-324
ISSN:0098-4108
年代: 1986
DOI:10.1080/15287398609530930
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The development and operation of a high‐voltage direct‐current (HVDC) transmission line in rural Minnesota generated public concern over potential adverse effects to nearby residents and their livestock. Electrical environmental parameters near an HVDC line decline rapidly with distance, but effects on ambient space charge have been detected out to 1 mile. Previous studies of powerline effects on livestock have involved the more common alternating‐current (HVAC) lines, which create a different electrical environment. To identify potential adverse effects of HVDC line operation on livestock, case‐control and cohort study methods were used to examine various indices of Holstein performance in relation to distance from the line and the onset of line operation. It was believed that these indices would reflect changes in physiologic function or overt health effects that might arise from the HVDC environment. High‐quality performance data from existing Dairy Herd Improvement Association (DHIA) records were obtained for 97% of qualifying herds located within 10 miles of the line. The large number of animals and years of observation provided high statistical power to detect even small systematic changes in performance. No significant differences in milk production or reproductive capacity were associated with presumed exposure to the HVDC environment. The absence of measurable effects in a large “sentinel” animal population may have implications for the assessment of human health risks related to HVDC transmission lines.
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