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Evaluation of the use of an artificial teat to measure the forces applied by a milking machine teatcup liner

  • Nicholas J. D. Adley (a1) and M. Clare Butler (a1)

Summary

An artificial teat containing a force transducer was constructed to study the forces exerted by the liner on the teat during milking. The objective was to develop a method of comparing the action of different liners under a variety of different milking conditions. The rigid structure of the artificial teat did not provide an accurate representation of a real teat but deformable models used in the past have not proved practical. Initial tests of the teat showed that it gave repeatable results during calibration. When placed in a liner, however, repeatable results could not be obtained if the teat–liner interface was disturbed. The forces that were measured under simulated milking conditions varied with liner wall position and with time. There was a peak and trough prior to a stable asymptotie value being attained and a noticeable time lag behind pulsation chamber pressure. This technique can be used to compare liners when a reliable method of locating the artificial teat within the liner has been developed.

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Butler, M. C. 1993 A mathematical model of the force exerted by the teatcup liner on the dairy cow's teat. Journal of Agricultural Engineering Research 54 211217
Butler, M. C. & Adley, N. J. D. 1994 Measurement of teatcup liner wall movement. Journal of Dairy Research 61 17
Caruolo, E. V. 1983 Measuring force of massage produced by the teatcup liner. Journal of Dairy Science 66 24412445
Gates, R. S. & Scott, N. R. 1986 Measurements of effective teat load during machine milking. Transactions of the ASAE 29 11241130
Mein, G. A., Brown, M. R. & Williams, D. M. 1983 Pulsation failure as a consequence of milking with short teatcup liners. Journal of Dairy Research 50 249258
Reitsma, S. Y., Cant, E. J., Grindal, R. J., Westgarth, D. R. & Bramley, A. J. 1981 Effect of duration of teatcup liner closure per pulsation cycle on bovine mastitis. Journal of Dairy Science 64 22402445
R⊘nningen, O. 1992 A non-invasive method for measuring the compressive load on teats and the congestion of the teat ends during milking. Proceedings of the International Symposium on Prospects for Automatic Milking, Wageningen, Netherlands pp. 106112. (EAAP publication no. 65)
Thiel, C. C. & Mein, G. A. 1977 The action of the cluster during milking. In Machine Milking, pp. 116155 (Eds Thiel, C. C. and Dodd, F. H.). Reading: National Institute for Research in Dairying (NIRD-HRI Technical Bulletin no. 1)

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Evaluation of the use of an artificial teat to measure the forces applied by a milking machine teatcup liner

  • Nicholas J. D. Adley (a1) and M. Clare Butler (a1)

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