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Transfer of Specific Blood Serum Proteins to Lacteal Secretions near Parturition¹

Laboratory of Biochemistry, Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Comparative quantitative electrophoretic studies were made of the specific protein components present in the lacteal secretions of heifers and dry and milked cows near parturition. Near parturition, the relative concentration of the specific proteins synthesized in the mammary gland decreased with a corresponding increase of protein components entering from the blood. Small amounts of all of the major blood protein components were detected in the secretions; however, as parturition approached the levels of two immune globulin components with the same properties as the blood, ß₂-and ₁-globulins increased to tremendous levels. Calculations of the amount of ß₂- and ₁-globulins leaving the blood indicated that they quantitatively accounted for the immune globulin components appearing in the lacteal secretions.

¹ Supported in part by aid from the Rockefeller Foundation.

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