An enterotoxigenic Escherichia coli (ETEC) vaccine designed to prevent diarrhoea was inoculated into dairy cows, and the occurrence of clinical mastitis was investigated for 2 years. Half of 480 cows in five farms were subcutaneously inoculated with ETEC vaccine (Imocolibov) twice with a 1-month interval in 2007 and 2008. Fisher's exact test and survival (time to event) analysis with the log-rank test were used to compare vaccinates and controls. In 2007, there was no significant difference in the incidence rate of mastitis between vaccinate (20.3%) and control (17.1%) cows. The rate of death or culling due to mastitis was lower in vaccinated cows (7.4%) than in control cows (29.2%, P=0.07, Fisher's exact test; P=0.02, log-rank test). In 2008, there was no significant difference in both the incidence rate of mastitis and the rate of death or culling due to mastitis. Milk productivity was compared between vaccinates and controls in one farm. Multi-way analysis of variance (ANOVA) was performed for the amount of 4% fat-corrected milk, and there was no significant difference between vaccinates and controls. These results suggest that ETEC vaccine inoculation reduces death or culling due to mastitis, whereas no preventive effect on the development of mastitis was observed.
Milk production loss after recovery from acute coliform mastitis causes major economic
losses for dairy industries. Declines in milk production and composition are caused by
multiple factors, including cow factors, microorganisms and treatments, but the influence
of each factor has not been determined. To investigate risk factors for milk loss after
treatment for acute coliform mastitis, multiple logistic regression analyses were
conducted in 53 clinical cases. Systemic administration of fluoroquinolone was
significantly associated with recovery of marketable milk production. The time to
slaughter was significantly shorter in cows with complete loss of quarter milk production
than in cows that produced marketable milk. In this study, we identified factors
associated with increased risk of milk production loss.
The aim of this study was to examine whether ultrasonography can be used to predict the outcome of clinical mastitis in dairy cows. Forty-seven mastitic quarters of Holstein-Friesian cows were examined using ultrasonography at the time of the first examination. In mastitic mammary tissue, three sonographic signs indicating tissue abnormality were found: a hyperechoic spot in the parenchyma area, structural changes How to cite this article: Suzuki N, Kurose T, Kaneko S, Haraguchi A, Isobe N. Outcome prediction from the first examination in clinical mastitis using ultrasonography in dairy cows.
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