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A trypsin inhibitor was isolated from bovine colostrum by affinity chromatography. Immunoelectrophoresis detected two immunogenic components in the isolated inhibitor, but only one of these was specific for the inhibitor; the other one was identical with an antigen present in liver, kidney, spleen, adrenal, thyroid, thymus, brain, ovarian, testicular and udder tissue and in bull seminal plasma. Using immunoabsorption and immunofluorescence it was shown that the antigens specific for the trypsin inhibitor of colostrum could be demonstrated only in the tissue of an udder that is secreting colostrum. The inhibitor is secreted by the secretory epithelium of the milk alveoli of the udder, during the period when the latter secretes colostrum. This inhibitor was not detected in the milk. Cross-reaction between antisera to colostral inhibitor and basic pancreatic inhibitor or seminal plasma inhibitors yielded negative results. Antiserum to bovine colostral inhibitor showed a positive reaction with inhibitor isolated from porcine colostrum.

Secretion and Immunochemical Properties of the Trypsin Inhibitor from Bovine Colostrum