Use of deflector shields to reduce intramammary infection by preventing impacts on the teat ends of cows during machine milking

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Abstract
A series of short duration experiments has shown that infections caused by the milking machine or the way in which it is used can be controlled by fitting deflector shields in the teatcup liners. This not only provides a simple means of controlling such infections, but demonstrates that they result from penetration of the streak canal of the teat by contaminated milk particles impacting on the teat ends.