P. Clark et De. Vanroekel, EFFICACY OF AN ESCHERICHIA-COLI BACTERIN FOR THE CONTROL OF COLIFORM MASTITIS IN DAIRY-COWS, Agri-Practice, 15(6), 1994, pp. 19-25
Herd surveys have indicated that 95% of clinical mastitis cases in dai
ry cows are associated with gram-positive bacteria, and the incidence
of mastitis associated with coliform bacteria is increasing. The prese
nt study was conducted to determine the efficacy of a commercial Esche
richia coli bacterin under severe challenge conditions in the control
of experimentally-induced coliform mastitis. Thirty-nine pregnant Hols
tein heifers were used in the study. Results indicated that vaccinatio
n of cows with the commercially available E. coli bacterin (Bovine Pil
i Shield(TM):Grand Laboratories, Inc., Freeman, S.D.) is effective in
lessening the clinical signs of E coli-induced mastitis. This reductio
n suggests that vaccination can be economically significant. Additiona
l longer term studies are needed to substantiate this finding.