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Journal of Dairy Science Vol. 66 No. 5 1198-1203
© 1983 by American Dairy Science Association ®
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Cost Benefit Analysis of Lactation Therapy with Somatic Cell Counts as Indications for Treatment1

Michael P. McDermott, Hollis N. Erb2,3, Roger P. Natzke4, Frances D. Barnes5 and David Bray4

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

2 Reprint requests.

ABSTRACT

Lactating dairy cows (487) from five commercial herds were in a study of benefits from lactation therapy of subclinical mastitis. Bacterial isolations and composite milk samples for somatic cell counts were taken from each cow each month for 15 mo. Cows (254) in the experimental group were infused with cephapirin in all quarters for two consecutive milkings if somatic cell counts rose above 400,000 cells/ml; 103 cows were so treated.

Stepwise regression showed that lactation number, somatic cell counts, days in milk, and percent quarters infected explained variation in milk production, but treatment group, herd, and season did not. Also, there were no significant differences between production of infected experimental and control cows with high somatic cell counts on test dates after treatment.

With the experimental program, there was a net loss of $19.65/cow. Intramammary lactation therapy based on somatic cell counts less than 400,000 cells/ml is not recommended.

FOOTNOTES

1 Supported in part by New York Dairy Herd Improvement Cooperative, Ithaca, NY 14850, and Bristol Veterinary Products, Syracuse, NY 13201.

3 Department of Preventive Medicine, New York State College of Veterinary Medicine, Cornell University, Ithaca, NY 14850.

4 Department of Dairy Science, University of Florida, Gainesville 36120.

5 New York State Mastitis Control Program, Ithaca, NY 14850.






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Copyright © 1983 by the American Dairy Science Association ®.