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Journal of Dairy Science Vol. 69 No. 5 1259-1269
© 1986 by American Dairy Science Association ®
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Changes in Bovine Milk Secretion Following Intramammary Infusions of Concanavalin A, Oyster Glycogen, or Water1

L. K. Fox2, L. L. Timms and L. H. Schultz

Department of Dairy Science, University of Wisconsin, Madison 53706

ABSTRACT

Effects of sterile intramammary infusion of Concanavalin A on milk secretion were contrasted with infusion of oyster glycogen or water. Twenty-four cows were infused intramammarily with 100 mg Concanavalin A, oyster glycogen in 20 ml water, or with 20 ml water alone. Concentrations of lactose, somatic cells, immunoglobulins G and A, serum albumin, and activity of N-acetyl-B-D-glucosaminidase were determined in milk. Blood N-acetyl-B-D-glucosaminidase activity and concentrations of blood immunoglobulins G and A and serum albumin were determined.

Oyster glycogen and concanavalin A caused inflammation in treated quarters; peak elevations of milk somatic cell counts, serum albumin, immunoglobulin G concentrations, and N-acetyl-B-D-glucosaminidase activity were at 12 to 36 h following treatment. Milk production and lactose concentration were reduced by oyster glycogen and Concanavalin A. Selective indices of relative accumulation of milk immunoglobulins decreased following Concanavalin A and oyster glycogen, whereas the N-acetyl-B-D-glucosaminidase activity selective index generally remained unchanged. Inflammation reduced the selective accumulation of immunoglobulins, and absence of change in the N-acetyl-B-D-glucosaminidase selective index indicated that blood is not a major source of milk N-acetyl-B-D-glucosaminidase.

FOOTNOTES

1 Research supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and US Department of Agriculture Animal Health Grant 144-N-467.

2 Department of Animal Science, Washington State University, Pullman 99164.






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Copyright © 1986 by the American Dairy Science Association ®.