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 100mm mercury. Elevation of intramammary pressure consistently reduced mammary blood flow. The response was linear with the regression equation: % of Control Flow = 99.5−.83×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.
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