Costs associated with selected preventive practices ...

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Title Costs associated with selected preventive practices and with episodes of clinical mastitis in nine herds with low somatic cell counts
Author(s) K. H. Hoblet, G. D. Schnitkey, D. Arbaugh, J. S. Hogan, K. L. Smith, P. S. Schoenberger, D. A. Todhunter, W. D. Hueston, D. E. Pritchard, G. L. Bowman, Lawrence E. Heider, B. L. Brockett, H. R. Conrad
Journal Journal of the American Veterinary Medical Association
Date 1991
Volume 199
Issue 2
Start page 190
End page 196
Abstract Nine dairy herds (mean size, 149 cows) with bulk-tank milk somatic cell counts of 80% of cows with Dairy Herd Improvement Association linear somatic cell counts >= 4 were selected for study. Each herd was monitored for 12 consecutive months. Duplicate quarter-milk specimens were collected from each cow for bacteriological culture at the beginning of lactation, cessation of lactation, and at the time of each clinical episode of mastitis. Streptococcus agalactiae was never isolated and Staphylococcus aureus was isolated from <1% of all quarters. There were 554 episodes of clinical mastitis. During the year of study, the incidence rate of clinical mastitis varied from 15.6 to 63.7% of cows among the 9 herds. Mean costs per cow per year in herd for mastitis prevention are given. Mean cost associated with clinical mastitis was $107/episode. Approximately 84% ($90) of the costs attributed to a clinical episode were associated with decreased milk production and non-saleable milk. Costs of medication and professional veterinary fees per clinical episode varied significantly among the 9 herds. Three of the herds did not have a veterinarian to treat a clinical episode of mastitis during the year of study even though 2 of these herds had the first and third highest incidence rates of clinical mastitis. When calculated on a per cow in herd basis, mean costs of $40/cow/year were attributed to clinical mastitis. It is suggested that herds that have effectively controlled mastitis caused by contagious pathogens may still have substantial economic losses as a result of clinical mastitis and that losses and even rates of clinical mastitis may vary considerably among such herds..

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