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Dynamic responses of the dairy cow's teat to step changes in pressure

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

Dynamic responses of the teat end, measured as changes in external diameter and milk flow-rate, due to step changes in pressure, uniformly applied to the whole teat, are presented. The experiment involved a front and a rear teat of each of 6 Holstein–Friesian cows. The measured variables were: (1) step change in pressure, (2) milk flow-rate, (3) step change in external teat end diameter, (4) rise times of pressure and teat end diameter changes, (5) fall times of pressure and teat end diameter changes, and (6) delay times between pressure and teat end diameter changes both at start of rise and of fall times. A statistical analysis showed that front teats expanded more than rear teats (P < 0·05). Several other findings of importance to any system of milk removal through the streak canal of the teat are discussed.

Type
Original Articles
Information
Journal of Dairy Research , Volume 46 , Issue 1 , January 1979 , pp. 15 - 25
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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