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Journal of Dairy Science Vol. 51 No. 7 1026-1030
© 1968 by American Dairy Science Association ®
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Effects of Unstable Milking Vacuum on Some Measures of Udder Health1

R. J. Eberhart, W. H. Cloninger and C. S. Card2

Departments of Veterinary Science and Dairy Science, Pennsylvania State University, University Park

ABSTRACT

Two groups of 15 cows each were milked for one year with two separate vacuum systems, one of which provided stable line vacuum, while the other showed moderate vacuum fluctuation on the line. During the experimental period, no differences were observed between the two groups in the mean of the logarithms of milk leucocyte counts, number of quarters newly infected with Streptococcus agalactiae or hemolytic staphylococci, or in number of attacks of clinical mastitis.

FOOTNOTES

1 Authorized for publication as Paper no. 3349 in the Journal Series of the Pennsylvania Agricultural Experiment Station.

2 Present address: Department of Pathology, College of Veterinary Medicine, Colorado State University, Fort Collins.






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Copyright © 1968 by the American Dairy Science Association ®.