Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-24T03:41:33.085Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanics of the teat and teatcup liner during milking: information from radiographs

Published online by Cambridge University Press:  01 June 2009

G. A. Mein ,
C. C. Thiel  and
D. N. Akam
G. A. Mein
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
C. C. Thiel
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
D. N. Akam
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
Get access Rights & Permissions [Opens in a new window]

Summary

For radiographic studies of the teat and teatcup liner during milking, quarters were infused with a suspension of propyliodone in milk. Simultaneous recordings of vacuum within the liner, in the mouthpiece chamber and in the pulsation chamber, and recordings of liner-wall movement, were made in conjunction with the radiographs.

The studies indicated that the sudden decline in milk flow-rate at the end of the period of peak flow-rate from each quarter, and the concurrent changes in the appearance and position of the teat in the liner, result from a fall in teat sinus pressure. This fall in pressure follows the partial closing of the milk passageway between the teat and udder sinuses. The changes initiating the closing of this connexion seem to occur above the teatcup and are associated with the declining amount of milk in the udder.

The teat is elongated by 33–50% as it enters the liner and further stretching of the skin of the teat throughout milking is negligible. Thus, increase in the depth of penetration of the teat into the liner is due to more of the teat entering the top of the liner.

The force exerted on the teat by the closed liner, which is greatest near the end of the teat, usually appears to increase near the end of milking. The force acting against the inner surface of the open liner barrel is greatest during the peak flow-rate period and it appears to be fairly uniform over most of the area of contact.

Type
Research Article
Information
Journal of Dairy Research , Volume 40 , Issue 2 , June 1973 , pp. 179 - 189
Copyright
Copyright © Proprietors of Journal of Dairy Research 1973

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Andreae, U. (1958). Zeitschrift für Tierzüchtung und Zūchtungsbiologie 71, 289.CrossRefGoogle Scholar
Ardran, G. M., Kemp, F. H., Clough, P. A. & Dodd, F. H. (1958). Journal of Dairy Research 25, 154.CrossRefGoogle Scholar
Baxter, E. S., Clarke, P. M., Dodd, F. H. & Foot, A. S. (1950). Journal of Dairy Research 17, 117.CrossRefGoogle Scholar
Bileck, J. & Janovsky, M. (1956). Nature 177, 582.CrossRefGoogle Scholar
Espe, D. & Cannon, C. Y. (1942). Journal of Dairy Science 25, 155.CrossRefGoogle Scholar
Foust, H. L. (1941). Journal of the American Veterinary Medical Association 98, 143.Google Scholar
Hoffmann, H.-W. (1970). Proceedings of the Symposium on the Biological and Technical Problems of Machine Milking, p. 86. Bydgoszcz: Towarzystwo Naukowe.Google Scholar
Kleinke, G. (1960). Bericht über den Forschungsauftrag, Nr. 2154, 21/011–04/09. lnst. f. Landtechn. der Karl-Marx-Univn, Leipzig. (Cited in Hoffmann, 1970.)Google Scholar
McDonald, J. S. (1968 a). American Journal of Veterinary Research 29, 1207.Google Scholar
McDonald, J. S. (1968 b). American Journal of Veterinary Research 29, 1315.Google Scholar
Mein, G. A., Clough, P. A., Westgarth, D. R. & Thiel, C. C. (1970). Journal of Dairy Research 37, 535.CrossRefGoogle Scholar
Mein, G. A., Thiel, C. C., Fulford, R. J. & Hoyle, J. B. (1973). Australian Journal of Dairy Technology 28, 31.Google Scholar
Mein, G. A., Thiel, C. C., Westgarth, D. R. & Fulford, R. J. (1973). Journal of Dairy Research 40, 191.CrossRefGoogle Scholar
Pier, A. C., Schalm, O. W. & Hage, T. J. (1956). Journal of the American Veterinary Medical Association 129, 347.Google Scholar
Rubeli, O. (1916). Schweizer Archiv für Tierheilkunde 58, 357. (Cited in Foust, 1941.)Google Scholar