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A frequency response of the dairy cow's teat

Published online by Cambridge University Press:  01 June 2009

Sybren Y. Reitsma  and
Norman R. Scott
Sybren Y. Reitsma
Affiliation:
Agricultural Engineering Department, Cornell University, Ithaca, N.Y. 14853, USA
Norman R. Scott
Affiliation:
Agricultural Engineering Department, Cornell University, Ithaca, N.Y. 14853, USA
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Summary

A frequency response of the cow's teat has been determined by applying sinusoidal changes in vacuum level to the teat. Twelve frequencies were applied ranging from 0.06 to 12 Hz. The responses investigated were the external teat end diameter and the teat milk flow-rate. The measured variables were: (1) frequency of applied pressure and teat end diameter, (2) peak-to-peak pressure and teat end diameter, (3) average vacuum level and teat end diameter, (4) time delay between maxima of vacuum level and teat end diameter, (5) time delay between minima of vacuum level and teat end diameter, and (6) teat milk flow-rate. The results showed that within the range of the investigation milk flow-rates were lower between 0.8 and 2.5 Hz than at frequencies both below and above this range. A statistical analysis of the flow rate and teat end diameter data supports the common practice of applying the same frequency to both front and rear teats during milking. Other findings show good agreement with results reported previously on dynamic responses of the teat to step changes in pressure.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 27 - 33
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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References

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