Vitamin C supplementation has no effect on American bullfrog’s immune response - Knoop, R; Dias, D. C; França, F. M; Antonucci, A. M; Teixeira, P. C; Furtado, Priscila Viau; Oliveira, Cláudio Alvarenga de; Hipolito, M; Ferreira, C. M (Journal of Animal Physiology and Animal Nutrition, 2015)