Dietary protein and amino acid intake and composition can modulate immune function. To evaluate the effects of high-protein intake and arginine and ornithine supplementation on feline immune cells. Ten healthy cats. Experimental study. Cats received a high-protein basal diet as a single daily meal. A crossover design was applied with treatments being basal diet (w/o); basal diet with arginine supplementation (+50, 75, 100% compared to the arginine provision by the basal diet; Arg 1-3); and basal diet with ornithine supplementation (+100, 150, 200% compared to the arginine provision by the basal diet; Orn 1-3). Blood samples were collected at the end of each 11-day treatment period. Mitogen-stimulated proliferative activity of blood leukocytes revealed a quadratic effect for the dietary supplementation of arginine (P = .02) and ornithine (P = .03) (means for ConA-stimulation: w/o = 6.96; Arg 1 = 9.31; Arg 2 = 11.4; Arg 3 = 8.04; Orn 1 = 15.4; Orn 2 = 9.43; Orn 3 = 9.28; pooled SEM: 0.96). The number (% gated) of phagocytic granulocytes linearly decreased with increasing dietary concentrations of arginine (P = .05) and ornithine (P = .03) (means: w/o = 95.5; Arg 1 = 93.0; Arg 2 = 92.5; Arg 3 = 92.6; Orn 1 = 92.6; Orn 2 = 92.6; Orn 3 = 91.5; pooled SEM = 0.44). This study could demonstrate immunomodulating properties of dietary arginine and ornithine in cats. © 2020 The Authors. Journal of Veterinary Internal Medicine published by Wiley Periodicals, Inc. on behalf of the American College of Veterinary Internal Medicine.
Nadine Paßlack, Barbara Kohn, Jürgen Zentek. Effects of arginine and ornithine supplementation to a high-protein diet on selected cellular immune variables in adult cats. Journal of veterinary internal medicine. 2020 Mar;34(2):852-856
PMID: 32086838
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