Abstract
The objective of this study was to examine whether serum iron (Fe) concentration is useful as a prognostic biomarker for cows with acute coliform mastitis (ACM). Our study was composed of determining the reproducibility of serum Fe concentration as a prognostic criterion in cows with ACM (Study 1) and clarifying the sequential changes in serum Fe concentration in cattle that received endotoxin (Study 2). Seventy-seven cows with (n = 47) or without (n = 30) ACM were enrolled in Study 1. The proposed diagnostic cut-off value of serum Fe concentration indicating a poor prognosis of ACM based on the analysis of the receiver operating characteristic curves was < 31.5 µg/dL. Ten young cattle aged 176.8 ± 23.7 days were enrolled in Study 2. Five young cattle received endotoxin (LPS group) and the remaining five received physiological saline (control group). Blood collections were carried out before endotoxin challenge (pre), and 0.5, 1, 2, 4, 8, 12, 24, and 48 h after the challenge. As a result, a significant decrease in serum Fe concentration was not observed until 24 h after endotoxin challenge. Because in cows with clinical ACM it is difficult to know the time course after infection, the alteration in serum Fe concentrations alone may be an insufficient prognostic criterion.
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