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Studies on the Use of Permanent Milk Pipelines in Dairy Barns. I. Effect of Different Types of Installation on Milk Quality

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Four different systems of milking and milk-handling at the farm were compared, including an open-combine system, a closed-combine system, a conventional machine milking system and a cow-to-cooler combine milker installed in a stanchion-type barn. The cow-to-cooler system involved delivery of the milk through a pipeline 200 ft. long which was cleaned throughout the study without dismantling.

Bacteriological analyses covered a period of 7 mo. and involved 484 observations. The results indicate that milk of acceptable quality can be produced by use of any one of these systems.However, personnel may be an important factor in the production of quality milk using the cow-to-cooler system cleaned in place. Variations in outside temperatures had very little effect on the bacterial count when the milk was cooled within 30 minutes. When cooling was delayed until the conclusion of the entire milking chore, there was a tendency toward a higher bacterial count when higher outside temperatures prevailed.