University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Angelika Latschbacher
(2013):
Anpassung der Herzaktivität bei Milchkühen nach dem Abliegen und Aufstehen in Abhängigkeit von Tageszeit, Alter und Verhalten.
Master / Diploma Thesis - Institut für Nutztierwissenschaften (NUWI),
BOKU-Universität für Bodenkultur,
pp 83.
UB BOKU
obvsg
- Abstract:
- This master thesis aimed at further developing reliable HRV analyses in dairy cows. To that end, the following was investigated: 1) the influence of lactation group, time of day and basic activity on selected HRV parameters; 2) the waiting period until a stable resting value was reached and 3) the differences in HRV parameters between the preliminary phase and lying, and also between lying and the subsequent phase of standing. The lying phases of four to five cows each from four lactation groups were analysed on three to four consecutive days by means of video recording at the research station Netluky of the Institute of Animal Science in Prague. Time domain (STDRR, meanHR, STDHR and RMSSD) as well as frequency domain parameters (VLF, LF and HF) were analysed. The number of lactations and the basic activity had a significant influence on nearly all HRV parameters. The time of day had an effect on some of the HRV parameters; the results indicate a higher sympathetic and a lower parasympathetic activity in the afternoon and therefore suggest that there may be circadian differences in heart activity. The time to reach a stable resting value, however, does not depend on the time of day. For cows of the first lactation the waiting period to reach a stable resting value was about two minutes, all other lactation groups needed about five minutes. Regarding changes in the HRV between phases significant effects were only observed for some of the time domain parameters. The adjustment of the heart activity was unaffected by the time of day. When ascertaining reference values for HRV parameters of lactating cows, it should be taken into consideration that, regardless of the time of day and with due regard to the influence of age, stable resting values during the lying phase are most likely reached after about 10 minutes.
- Beurteilende(r): Winckler Christoph
- 1.Mitwirkender: Gutmann Anke