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Journal of Dairy Science Vol. 56 No. 10 1319-1323
© 1973 by American Dairy Science Association ®
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Intramammary Pressure and Mammary Blood Flow in Lactating Goats

S. L. Pearl, H. F. Downey1 and T. L. Lepper

Department of Veterinary Physiology and Pharmacology and Department of Physiology and Biophysics, University of Illinois, Urbana 61801

ABSTRACT

Blood flow to the udders of four conscious, lactating goats was recorded from a surgically implanted electromagnetic flow transducer while intramammary pressure was artificially altered in the range 5 to 100 mm mercury. Elevation of intramammary pressure consistently reduced mammary blood flow. The response was linear with the regression equation: % of Control Flow = 99.5 – .83 x Intramammary Pressure. Mammary blood flow responded slowly to abrupt changes in intramammary pressure, and reactive hyperemia was never observed following pressure release. Both air and milk were utilized to alter intramammary pressure, and no difference in response was significant. When the contralateral side was insufflated, no alteration in the blood flow occurred. Lidocaine in a supramammary line block partially diminished the response to elevated intramammary pressure.

FOOTNOTES

1 Present address: Cardiopulmonary Institute, University of Texas Health Science Center, P. O. Box 5999, Dallas, Texas 75222.




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[Abstract] [Full Text] [PDF]


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