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Factors affecting the measurements of draught force, work output and power of oxen

  • P. R. Lawrence (a1) and R. Anne Pearson (a1)
Summary

Measurements were taken of the draught force, speed and power of three pairs of oxen performing a variety of tasks for long (30 sec) or short (5 sec) periods. True draught force was measured by integrating the force exerted with respect to distance (DADF) and apparent draught force by integrating with respect to time (TADF). The latter type of measurement is that normally obtained from commercially available dynamometers.

In the first experiment short TADF measurements were found to be greater and more variable than long DADF measurements by up to 38% for a variety of jobs. In the second and third experiments in which TADF and DADF were measured completely simultaneously, TADF was nearly always larger than DADF, and the difference tended to be greater with large or jerky loads and smaller, less experienced oxen.

For any given task, the observed variability in replicate measurements of draught force or power was substantially reduced by using long rather than short measurements. However, this effect was not observed in the case of speed of travel.

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COPYRIGHT: © Cambridge University Press 1985
References
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Ministers De La Cooperation De La Republique (1974). Memento de l'agronome – techniques rurales en Afrique.
Smith, A. J. (1981 a). The role of draught animals in agricultural systems in developing countries. In Vegetable Productivity (ed. Spedding, C. R. W.), pp. 247–262. London: Macmillan.
Smith, A. J. (1981 b). Draught animal research – a neglected subject. World Animal Review 40, 43–48.
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The Journal of Agricultural Science
  • ISSN: 0021-8596
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