HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by McDonald, J. S. Articles by Witzel, D. A. Search for Related Content PubMed Articles by McDonald, J. S. Articles by Witzel, D. A.

Differential Pressures Across the Bovine Teat Canal During Three Methods of Milk Removal

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

ABSTRACT

Two cows and their 10- and 15-day-old calves were used to compare the differential pressures and the sequence of events during mechanical milking, hand milking, and calf suckling. A pulsator rate of 48 per minute and a milking vacuum of 12.5 in. Hg were used during mechanical milking. The average frequency of hand milking and calf suckling was 67 and 117 cycles per minute, respectively. Average differential pressures across the teat canal were 310 mm Hg for hand milking, 352 mm Hg for mechanical milking, and 535 mm Hg for calf suckling. The udder appeared to be evacuated most rapidly during calf suckling, which was attributed to the rapid suckling cycle and the high differential pressure across the teat canal.