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Intramammary Pressures between Milkings in the Lactating Cow¹

National Animal Disease Laboratory, Animal Disease and Parasite Research Division, ARS, USDA, AMES, Iowa

ABSTRACT

Intramammary pressures (IMP) were studied between milkings in 11 lactating cows. Continuous recording of IMP after initial cannulation permitted observation of IMP changes in the absence of milk ejection. The data showed a gradual increase in IMP over the entire recording period. In 9 of 11 cows the IMP did not exceed 12 mm Hg at 12 hr after milking. In two cows the IMP was 18 and 22 mm Hg at 12 hr after milking. Continuous recording without repeated cannulation and subsequent milk ejection probably accounted for IMP lower than those reported in other studies.

¹ Taken, in part, from a thesis to be submitted by the senior author to the Graduate College, Iowa State University (Ames, Iowa) in partial fulfillment of the requirements for the M. S. degree in Physiology, Department of Physiology and Pharmacology, College of Veterinary Medicine.