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Teat Sinus Vacua at Different Milking Machine Vacua and Pulsator Ratios

National Animal Disease Laboratory, ADP Research Division, ARS, USDA, Ames, Iowa

ABSTRACT

Nine quarters of three cows were used in measuring maximum and residual teat sinus vacua after the end of milk flow at four milking vacuum levels and two pulsator ratios. The increase in maximum and residual teat sinus vacua was nearly linear from 250 to 400 mm Hg milking vacuum. Between 400 and 500 mm Hg milking vacuum, the increase in maximum teat sinus vacuum was nonlinear and increased rapidly. Congestion of the teat end and signs of discomfort to the cow were observed when the milking vacuum was 500 mm Hg. From results of this study, it would appear that a stable milking vacuum above 400 mm Hg should be avoided, because of excessive teat sinus vacuum and possible teat injury.