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Journal of Dairy Science Vol. 75 No. 4 1019-1024
© 1992 by American Dairy Science Association ®
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The Control of Milk Flow Through the Teats of Dairy Cows

M. C. Butler 1, J. E. Hillerton 2, and R. J. Grindal 2

1 Silsoe Research Institute Wrest Park, Silsoe Bedford, MK45 4HS, England
2 Institute for Animal Health Compton, Newbury, Berkshire, RG16 ONN, England

The effects of teat smooth muscles and pulsation on the control of rate of milk flow have been investigated in two split udder experiments during machine milking of dajr cows. men two teats were milked without pulsation, the peak flow rate was reuced by .132 kgEmin for these teats and by .l07 kg/min for the sation. Both of these reductions were statistically significant. This suggests that there is systemic control of the teat sphincter muscle. When systemic muscle control was removed by treatment with clenbuterol, a ß-agonist, all flow rates increased. However, when the proportion of the pulsation cycle for which milk flow can occur was considered, the actual flow rate for teats milked without pulsation was approximately 36% lower than that for teats milked with pulsation. This was independent of clenbuterol treatment, suggesting that this local control is independent of overall muscle tone.

Key Words: milk flow rate • dairy cows • smooth muscle

Submitted on June 28, 1991
Accepted on October 16, 1991




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V. Tancin, B Ipema, P. Hogewerf, and J. Macuhova
Sources of variation in milk flow characteristics at udder and quarter levels.
J Dairy Sci, March 1, 2006; 89(3): 978 - 988.
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Copyright © 1992 by the American Dairy Science Association ®.