The effect of age and carbohydrate and protein sources on digestibility, fecal microbiota, fermentation products, fecal IgA, and immunological blood parameters in dogs - Maria, A. P. J; Ayane, L; Putarov, Thaila C; Loureiro, B. A; Neto, B. P; Casagrande, M. F; Gomes, Marcia de Oliveira Sampaio; Glória, M. B. A; Carciofi, Aulus Cavalieri (Journal of Animal Science, 2017)