Three experiments were conducted using implanted heart rate (HR) transmitters. In the first experiment three lactating Holstein cows' HR signals were monitored telemetrically for three successive days under the normal herd management. Overall mean and standard error for these cows was 76.1 ± 0.46 bpm. In the second experiment the same three cows' HR signals were monitored with a portable computer and receiver. The cows were transported 400 kilometers one way over various road surface conditions. The HR signals were monitored consecutively at the beginning of the trip and at hourly intervals during travel. The cows stayed overnight and were brought back the next day. This two-day journey was repeated one week later. As travel commenced, the cows' HRs averaged 89.7 bpm and differed significantly (p
In a second experiment, two cows were exposed to five different types of aircraft noises--helicopter low altitude flyover and hover, fixed-wing low altitude flyover, jet aircraft low altitude subsonic flyover, and high altitude supersonic boom. The cows were exposed to four to five flyovers of the same type of aircraft at approximately five-minute intervals. Intervals between different aircraft type flyovers were at least one hour. Two noise disturbance experiments were conducted seven days apart. Supersonic booms and helicopter flyovers had significant effects on HR response. With increasing exposures to aircraft disturbances, there was a reduction in HR response.
| Identifer | oai:union.ndltd.org:UTAHS/oai:digitalcommons.usu.edu:etd-5070 |
| Date | 01 May 1992 |
| Creators | Ahn, Hoon M |
| Publisher | DigitalCommons@USU |
| Source Sets | Utah State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | All Graduate Theses and Dissertations |
| Rights | Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact Andrew Wesolek (andrew.wesolek@usu.edu). |
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