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Pressure Changes in Teat Sinus at End of Machine Milking

Agricultural Institute, Dairy Research Centre, Fermoy, Co. Cork, Ireland

T. O'Flaherty

Agricultural Institute, Agricultural Engineering Dept., Carlow, Ireland

ABSTRACT

Teat sinus pressures were studied in cannulated and normal teats of three cows. The presence of a polythene cannula in the teat sinus allowed artificially high residual vacua (50–250 mm mercury) to be recorded during overmilking. In noncannulated teats low levels of residual vacuum (4–12 mm mercury) were found when an alternative method of measurement was used. Immediately the teat cup is removed, residual vacuum in the teat sinus disappears, presumably because milk can move from the gland sinus into the teat once occlusion by the mouth of the liner occurring at the end of milking ceases. When teats were manually occluded before removing the teat cup, even high residual vacuum persisted indefinitely in the teat sinus. This suggests that aspiration of bacteria through the streak canal does not regularly occur.

⁸ Visiting Research Worker from Ruakura Agricultural Research Centre, Hamilton, New Zealand.