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Concentrations of (A) faecal IgA (µg IgA/µg TP), (B) serum IgA (g/l) and (c) serum IgE (g/l) in puppies at 7 weeks, 12–13 months and 15–18 months of age and their mothers at 7 weeks pp. Mean and sds are indicated in blue. pp, postpartum; TP, total protein
