Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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The Effects of Recording Interval on the Estimation of Grazing Behavior of Cattle in a Daytime Grazing System

  • Hirata, M. (Division of Grassland Science, Faculty of Agriculture, Miyazaki University) ;
  • Iwamoto, T. (Division of Grassland Science, Faculty of Agriculture, Miyazaki University) ;
  • Otozu, W. (Division of Grassland Science, Faculty of Agriculture, Miyazaki University) ;
  • Kiyota, D. (Division of Grassland Science, Faculty of Agriculture, Miyazaki University)
  • Received : 2001.08.27
  • Accepted : 2001.12.20
  • Published : 2002.05.01
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Abstract

The effects of recording interval (1, 2, 3, 4, 5, 10, 15, 20 and 30 min) on the estimation of some grazing behavior variables in beef cows and calves (<4 months old) were investigated in a daytime grazing (7 h) system utilizing a bahiagrass (Paspalum notatum Flugge) pasture (a 1.1 ha paddock and a 0.4 ha resting area). Recording intervals of 10-30 min tended to underestimate the time spent grazing and ruminating and overestimate the time spent resting by animals, whereas intervals of 1-5 min resulted in almost constant estimates. In all grazing activities, the errors of estimation became larger when the recording interval exceeded 5 min. The accuracy of estimation was higher for grazing time>rumination time>resting time. An increase in recording interval always decreased estimates of the distance walked by animals. It was concluded that recording intervals of 1-5 min provide reliable estimates of the time spent grazing, ruminating and resting. It was also concluded that positioning of animals at 1 min intervals may provide estimates of walking distance with acceptable bias toward underestimation.

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References

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