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Journal of Dairy Science Vol. 65 No. 7 1252-1257
© 1982 by American Dairy Science Association ®
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Effects of Vacuum and Pulsation Ratio on Udder Health1

D. E. Mahle2, D. M. Galton3 and R. W. Adkinson

Dairy Science Department, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803

ABSTRACT

Effects of vacuum and pulsation ratio on udder health were studied for 36 first parity animals in a 60-day trial. Treatments consisted of vacuum at 33.3, 41.6, and 50 kPa at pulsation ratios of 50:50, 60:40, and 70:30 at 60 pulsations per min. All teats were exposed to a culture broth of Staphylococcus aureus after machine removal. Numbers of intramammary infections and somatic cells were determined. Analysis for number of intramammary infections indicated no significant differences among treatments for number of infected available quarters. Trend for intramammary infections was that as pulsation ratio widened, the number of infected available quarters increased, especially at the ratio 70:30. As vacuum increased, number of infected available quarters increased. Least squares means of Wisconsin Mastitis Test scores were 6.29, 5.57, and 6.68 for 33.3 kPa; 12.18, 3.82, and 7.86 for 41.6 kPa; and 9.11, 6.40, and 15.02 for 50 kPa at pulsation ratios 50:50, 60:40, and 70:30. There were significant differences among treatments for vacuum and pulsation ratio. Wisconsin Mastitis Test data indicated an interaction between vacuum and pulsation ratio. Optimum predicted vacuum and pulsation ratio based on Wisconsin Mastitis Test data were 27.2 kPa and 62:38.

FOOTNOTES

1 Research supported partially by a grant from Babson Bros. Co., 2100 S. York Road, Oak Brook, IL 60521.

2 Babson Bros. Co., 2100 S. York Road, Oak Brook, IL 60521.

3 Department of Animal Science, Cornell University, Ithaca, NY 14853.






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