Data from 62 Japanese Black calves were collected to clarify the effects of dam's parity on serum immunoglobulin G (IgG) and fecal immunoglobulin A (IgA) in calves at 2 days of age and to evaluate the relationships among serum IgG, fecal IgA and fecal water in calves. Mean serum IgG in calves at 2 days of age was 18.8 mg/mL, ranging from 2.2 to 37.8 mg/mL, whereas mean fecal IgA was 13.8 mg/g, ranging from 0.004 to 59.3 mg/g. Except for one calf which contained 90.1% of fecal water, diarrhea did not occur in 61 calves, because the fecal water contents were below 80%. Serum IgG and serum total protein tended to be lower in calves born from primiparous cows, and there was a positive correlation between serum IgG and serum total protein in calves. Serum IgG concentrations in calves increased with the increased fecal water contents, but there were no relationships between fecal IgA and serum IgG nor fecal water in calves.
14 days of age, which was thought to be the increased mucosal IgA induction in the gut. Serum cholesterol concentration tended to be lower in calves fed whey than in control group, but feeding whey protein had no clear effects on serum glucose, NEFA, total protein and urea-N concentrations. These results suggest that feeding whey protein enhances mucosal IgA induction in calves, but feeding whey protein has little effect on growth rate and fecal consistency in calves.
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