Zaine, L., Ferreira, C., de O. S. Gomes, M., Monti, M., Tortola, L., Vasconcellos, R. S., et al. (2011). Faecal IgA concentration is influenced by age in dogs. British Journal of Nutrition, 106(Supplement S1), S183–S186.
Abstract: Data comparing age-related alterations in faecal IgA concentrations of dogs are not available in the literature. The present study aimed to
compare the faecal concentrations of IgA in puppies, mature and senior dogs. A total of twenty-four beagle dogs were used, including
eight puppies (5 months old, four females and four males), eight mature (4·6 years old, eight males) and eight senior dogs (10·6 years
old, three males and five females). Fresh faecal samples were collected from each dog for three consecutive days and pooled by
animal. After saline extraction, IgA content was measured by ELISA. Data were analysed by one-way ANOVA, and means were compared
with Tukey’s test (P,0·05). Results showed that puppies have lower faecal IgA concentrations than mature dogs (P,0·05); senior animals
presented intermediary results. The reduced faecal IgA concentration in puppies is consistent with the reduced serum and salivary IgA
concentrations reported previously, suggesting a reduced mucosal immunity in this age group. Although some studies have found an
increased serum IgA concentration in older dogs, this may differ from the intestinal secretion of IgA, which appears to be lower in
some senior animals (four of the eight dogs studied).
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