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Effect of probiotic supplementation on interleukins production in splenocytes of aging animals during 2 months of feeding in respective diet groups: BD, basal diet; SM, skim milk; LR, L. rhamnosus fermented milk. a IFN-γ. b IL-4. c IL-10. Bar in black shows respective reference values in young (4 months old) animals. Values are mean ± SEM; values with different letters are significantly different within the group at P < 0.01. **P < 0.01 for treatments fed for 1 versus 2 months
