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Evaluation of a Hygiene and Dry Period Therapy Program for Mastitis Control¹

Department of Veterinary Science and Dairy Science, The Pennsylvania State University, University Park 16802

ABSTRACT

In two trials half of the cows were subjected to a postmilking test dip and and dry period therapy of all quarters while the other half were untreated controls. In the first trial involving 120 cows over 2 years the proportion among treated cows of quarters infected with Streptococcus agalactiae decreased from 21.8 to 1.6% and with Staphylococcus aureus from 9.5 to 2.9% whereas controls showed much smaller changes. The new infection rate was 1.03 infections per cow-year in treated cows and 1.50 in controls. Clinical mastitis was not reduced in treated cows due in part to an increase in coliform infections. Wisconsin Mastitis Test scores of quarter samples were significantly reduced in treated cows.

The second trial involved 80 cows over 60 weeks; these cows had a low initial intramammary infection. Among treated cows S. agalactiae infection, new infection rate, and cases of clinical mastitis were reduced from controls, and there was no increase in coliform infections.

¹ Approved March 2, 1972 as Paper 4149 in the Journal Series of the Pennsylvania Agricultural Experiment Station.