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Journal of Dairy Science Vol. 74 No. 5 1527-1538
© 1991 by American Dairy Science Association ®
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Endotoxin Mastitis in Cows Milked Four Times Daily

D. E. Shuster 1, R. J. Harmon 1, J. A. Jackson 1, and R. W. Hemken 1

1 Department of Animal Sciences, University of Kentucky, Lexington 40546-0215

As part of a project to identify the pathophysiological cause or causes of mastitic hypogalactia, midlactation cows were infused in two homolateral quarters with 10 µg of endotoxin while Wing milked four times daily to resolve better the temporal changes in mammary synthetic activity during endotoxin mastitis. Milk fat was decreased by the first milking (5 h) postinfusion and then recovered rapidly. In contrast, milk yield and the yields of protein and lactose were not significantly inhibited until the second milking, and these yields recovered slowly thereafter. The decline in milk yield by infused quarters was only 20% greater than the decline by uninfused quarters in this experiment. Mammary inflammation developed rapidly in infused quarters as milk serum albumin concentration was maximal at the first milking. Milk SCC and NAGase were also elevated at this time, and maximal levels temperature, increased cortisol, and a mild anorexia were apparent at the first milking only. Endotoxin treatment had no effect on serum prolactin or glucose. These data suggest that the delayed hypogalactia is consequent to the mammary inflammation and systemic responses following endotoxin infusion. The results indicate that different pathophysiological events may inhibit occurred at milkings 2 to 4. Increased synthesis of the different milk components.

Key Words: endotoxin mastitis • milk production • somatic cell count

Submitted on September 17, 1990
Accepted on January 15, 1991




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