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Responses of the bovine teat to machine milking: measurement of changes in thickness of the teat apex

Published online by Cambridge University Press:  01 June 2009

Jörn Hamann  and
Graeme A. Mein
Jörn Hamann
Affiliation:
Institute for Hygiene, Federal Dairy Research Centre, Hermann-Weigmann-Straβe 1–27, Kiel, FRG.
Graeme A. Mein
Affiliation:
Food Research Institute, Werribee, Victoria 3030, Australia
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Summary

Changes in the teat apex before and after different milking treatments were measured with a spring-loaded caliper device known as a cutimeter which could detect changes in thickness of the tissues of the teat end, presumably due to congestion and/or oedema, with a high degree of accuracy (± 2%) and repeatability (r = 0·99). Teat end thickness increased with increasing vacuum level. The mean increase immediately after milking with a conventional cluster was 2% for 24 teats milked at 30 kPa, 8% at 50 kPa and 21% at 70 kPa. At these vacuum levels, the mean increases for the same teats milked with an unconventional (PKME) teatcup were 10, 18 and 25% respectively. Cyclic application of 35 kPa positive pressure to the pulsation chamber of a conventional teatcup operating at 50 kPa reduced teat end thickness by 8% compared with the mean premilking value. Although most teats returned to within ± 2% of their premilking thickness values by 1 h after milking, differences were apparent between different milking systems for up to 4 h postmilking.

Type
Original articles
Information
Journal of Dairy Research , Volume 55 , Issue 3 , August 1988 , pp. 331 - 338
Copyright
Copyright © Proprietors of Journal of Dairy Research 1988

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References

REFERENCES

Francis, P. G. 1981 Teat lesions and machine milking. In Mastitis Control and Herd Management, pp. 237–250 (Eds Bramley, A. J., Dodd, F. H. and Griffin, T. K.). Reading: National Institute for Research in Dairying (NIRD/HRI Technical Bulletin no. 4)Google Scholar
Hamann, J. 1985 Effect of machine milking on teat end condition. A literature review, International Dairy Federation Subgroup A2D (in press)Google Scholar
International Standards Organisation. 1977 Milking Machine Installations – Vocabulary. (Standard 3918)Google Scholar
Jackson, E. R. 1970 An outbreak of teat sores in a commercial dairy herd possibly associated with milking machine faults. Veterinary Record 87, 2–6CrossRefGoogle Scholar
Mein, G. A., Thiel, C. C. & Akam, D. N. 1973 Mechanics of the teat and teatcup liner during milking: information from radiographs. Journal of Dairy Research 40 179–189CrossRefGoogle Scholar
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 50 249–258CrossRefGoogle Scholar
Mein, G. A. & Williams, D. M. 1984 Liner massage and teat condition. Proceedings, Annual Meeting, National Mastitis Council 23 4–18Google Scholar
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 2240–2245CrossRefGoogle Scholar
Tolle, A. & Hamann, J. 1978 Operational characteristics of non-conventional systems using constant vacuum. Proceedings, Annual Meeting, National Mastitis Council 17 150–161Google Scholar
Woolford, M. W. & Phillips, D. S. M. 1978 Evaluation studies of a milking system using an alternating vacuum level in a single chambered teatcup. Proceedings, Annual Meeting, National Mastitis Council 17 125–149Google Scholar