Used teat-cup liners, appearing in reasonably good physical condition but having microscopic breakdown of the inside surfaces, were compared with new liners with respect to effect on the bacterial counts of milk. Under similar practical conditions, milk from units equipped with the used liners sometimes had considerably higher counts than milk from the new liner units. When the contamination level was low there was little consistent difference in milk counts.

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Author notes

1Contribution No. 231, Department of Dairy Husbandry, Kansas Agricultural Experiment Station, Manhattan.

Dr. Claydon received the B.S. degree from the University of Saskatchewan and the M.S. and Ph.D. degrees from Iowa State College. He has served on the staff of the University of Arkansas, and subsequently spent two years with the Dairy Products Division, Arkansas State Board of Health. Dr. Claydon's present position is Associate Professor, Dairy Husbandry, Kansas State College.