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Changes in Curd Strength Due to Dialysis of Abnormal Against Normal Milk

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

The effect of dialysis of Wisconsin Mastitis Test positive (WMT > 20 mm) versus negative (WMT < 10 mm) milk on curd strength of paired quarter milks from individual cows was investigated. Dialysis of positive against negative milks (1:10 v/v ratio) for 36 hr at 4.5 C increased the average curd tension of positive milks 26% and decreased the curd tension of negative milks 21%. Similar dialysis of skimmilk from positive and negative milks doubled the curd firmness of the positive and decreased curd firmness of negative skimmilks 14 to 27%. Although dialysis greatly increased curd strength of positive milks, curd tension and curd firmness after dialysis were still lower for negative milk or skimmilk. Changes in curd strength were related to the equilibrium of calcium and phosphorus concentrations of the WMT positive and negative milks.

¹ Present address: Department of Animal and Food Science, Wisconsin State University, River Falls 54022.